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Harris Intelligent Transmitter Platinum-i Series, Technical Manual

The Harris Intelligent Transmitter Platinum-i Series is a cutting-edge device designed to provide exceptional performance in transmitting data. To assist users in understanding its advanced features and functionalities, we offer a comprehensive Technical Manual for free download. Visit our website to access this invaluable resource and make the most out of your Platinum-i transmitter.

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______________________________________________

HARRIS

 

 

888-9058-001 

WARNING: Disconnect and lockout AC primary power prior to servicing

 

196

8.3.5 Locating Failed RF FETs 
 

8.3.5.1 DC Resistance Test 

The most common symptom of a bad FET is an ISO fault (3 blinks). Using a analog or 
digital multimeter (or equal), measure the DC resistance from the gate to ground of each 
FET. This is done with the module on the bench with neither RF or DC power applied. 
Compare the resistance measured from one FET to the next. The resistance indicated 
will vary with the voltage of the multimeter used. A resistance on one FET significantly 
lower than the others indicates a bad FET or leakage in a gate chip capacitor. 
 
If no FET indicates a low gate to ground resistance proceed to idle current testing. 
 

8.3.5.2 Idle Current Test 

First, it is necessary to determine the original bias current per FET, and to determine on 
which quarter module the failed FET lies. For this procedure, no RF drive will be 
applied; however, a RF load resistor should still be placed at the module output to 
prevent oscillation. 
 
Starting with the first quarter module (nearest the logic board) and working toward the 
front handle, measure the total idle current of each quarter module in turn. Either insert 
a current meter in line with the 50 Volt wire at TB1, or use a clamp-on DC current meter 
if available. With no RF drive applied, apply 50 Volts and enable the module. Note the 
quarter module current, disable the module, remove the 50 Volts and move the current 
meter to the next quarter module. 
 
If no current meter of sufficient range is available, a small resistance can be placed in 
series with the 50 V line, and the voltage drop used to calculate current from Ohms Law 
(I=V/R). Values from 0.1 to 0.2 ohms should be satisfactory. A sensitive digital meter 
with a millivolts range is needed to use this technique. 
 
After taking the current measurements on each quarter module, determine the correct 
bias current setting per FET. A bias current value marked on the hold down spring 
should be used instead of this chart. 
 

• 

Analog and Platinum-i Modules: 

 
Driver: Low Band1.0 Amp, High Band, Quarters # 1&2 = 400mA, 3&4=1.0 Amp. 
  
HB&LB PAs: all FETs bias at 300 or 400ma, check hold down spring bar. 
 
 
 
 
 
 

Summary of Contents for Intelligent Transmitter Platinum-i Series

Page 1: ...NICAL MANUAL 888 9058 001 Platinum i Series Intelligent Transmitter Platinum i Series Intelligent Transmitter T M No 888 9058 001 Copyright Harris Corporation 2008 2010 Rev B 20 May 2010 All rights reserved ...

Page 2: ...ceived equipment is not damaged Locate and retain all PACKING CHECK LISTS Use the PACKING CHECK LIST to help locate and identify any components or assemblies which are removed for shipping and must be reinstalled Also remove any shipping supports straps and packing materials prior to initial turn on Technical Assistance HARRIS Technical and Troubleshooting assistance is available from HARRIS Field...

Page 3: ...lockout AC primary power prior to servicing 3 Manual Revision History Platinum i Series Intelligent Transmitter Technical Manual Rev Date ECN Description A 22Apr2010 P43417 Released B 20May2010 P47546 Revised Title Page MRH and Step 2 on Page 90 Guide to Using Harris Parts List Information ...

Page 4: ...mber starts Inside the actual tables four main headings are used Table ITEM NAME HARRIS PART NUMBER this line gives the information that corresponds to the Replaceable Parts List Index entry HARRIS P N column gives the ten DIGIT Harris part number usually in ascending order DESCRIPTION column gives a 25 character or less description of the part number REF SYMBOLS EXPLANATIONS column 1 gives the re...

Page 5: ...lies will have 9xx xxxx xxx numbers associated with them The term SEE HIGHER LEVEL BILL in the description column implies that the reference designated part number will show up in a bill that is higher in the tree structure This is often the case for components that may be frequency determinant or voltage determinant and are called out in a higher level bill structure that is more customer depende...

Page 6: ...______________________________________________HARRIS 888 9058 001 WARNING Disconnect and lockout AC primary power prior to servicing 6 ...

Page 7: ...pment local building codes and fire protection standards must be observed The following National Fire Protection Association NFPA standards are recommended as reference Automatic Fire Detectors No 72E Installation Maintenance and Use of Portable Fire Extinguishers No 10 Halogenated Fire Extinguishing Agent Systems No 12A WARNING ALWAYS DISCONNECT POWER BEFORE OPENING COVERS DOORS ENCLOSURES GATES ...

Page 8: ...er AGC Module 26 Phase and Gain 26 Signal Interface 27 RF PA Cabinets 27 50 Volt Power Supply 27 RF Output Systems 27 Platinum RF Combining para 28 Percent of Cabinet Power 3 Cab 28 Percent of Cabinet Power 4 Cab 29 Specifications 30 Section 2 Installation Introduction 33 Installation Planning 33 Space Requirements 35 Weights 35 RF System Layout 35 Air System 36 Outside Air Cooling 36 Air Conditio...

Page 9: ...Manual 67 Setup 68 Detailed Installation Procedures 69 CD 1A Exciter Serial Number Reset 69 eCDi Configuration 70 Troubleshooting Tips 72 Apply Changes 86 Backing Up the Configuration 87 Restoring a Configuration File 87 Reset Computer IP Address 87 eCDi Software Updates 88 Updating the eCDi 88 Before Starting 88 Main Controller SerialProgram 91 Exciter Switcher 92 AGC Module 93 PA Cabinets 95 Sla...

Page 10: ...oller Exc Swtchr Sht 10 145 Line Voltage AGC Mon Sht 11 145 Interlocks Sheet 12 146 Peak Detectors Shts 13 and 14 146 Fault Detection Sheet 15 146 Dual Tran Interface Sheet 16 147 Remote Commands Input Sht 17 147 Remote Status Out Shts 18 19 147 Optional Remote Status Sht 20 147 Remote Analog Outputs Sheet 21 147 DC Distribution 148 The Slave Controller Descrip 148 Slave Controller 148 Sheet 1 148...

Page 11: ...r Modules 180 Low Band Quarter Module 180 High Band Quarter Module 181 Quarter Module Bias 182 Protection Cntrl Monitor 183 Module Status LEDs 184 Red LED Fault Blink Codes 185 Module Troubleshooting 186 Platinum Module Test Fix 187 Troubleshooting Module Swap 189 Troubleshooting Blink Codes 189 Isolating Other Failures 194 Locating Failed RF FETs 196 DC Resistance Test 196 Idle Current Test 196 P...

Page 12: ...______________________________________________HARRIS 888 9058 001 WARNING Disconnect and lockout AC primary power prior to servicing 12 NOTES ...

Page 13: ... HT44LSP 44 KW 1 1 1 Transmitter Configurations The Platinum i series contains a separate intelligent control cabinet that can be used in multiple Platinum Analog transmitter configurations There are 2 basic PA cabinet configurations Standard and Parallel Path In Standard configuration a separate PA cabinet houses vision Driver s vision Driver PAs sound Driver s and the sound PAs This cabinet is o...

Page 14: ... sections Section 1 Introduction Section 2 Hardware Installation Section 3 Software Installation and Setup Section 4 Operation Section 5 Control System Theory of Operation Section 6 Control Cabinet Section 7 PA Cabinet Section 8 RF Modules Section 9 50 Volt Power Supply Section 10 Parts Listing There are different drawing packages for low band and high band systems the drive chains and modules are...

Page 15: ... control cabinet one or more power amplifier cabinets PA and RF output system The RF system includes a color notch filter harmonic filter and a vision plus sound RF combiner feeding the antenna The eCDi version of the control cabinet will be used with new Platinum i cabinets and as a retrofit to older PA cabinets The different versions of the PA cabinet will use various drive configuration and dif...

Page 16: ...l path and visual drive chain and one for the visual final 30 kW transmitters have one cabinet for aural path and visual drive chain and two 15 kW visual final cabinets 45kWunits have two aural path visual drive chain cabinets and three 15 kW visual finals Finally 60 kW transmitters have six cabinets doubling the 30 kW architecture In transmitters with multiple visual amplifier cabinets outboard h...

Page 17: ...ouch screen and operation button back up the touch screen button functions 1 2 4 Main Controller The transmitter main control unit provides a central point for control and monitoring the entire system The main controller interfaces with the slave controller s for the amplifier cabinets ON OFF commands and with the exciter for power RAISE LOWER commands Peak detectors collect aural and visual RF sa...

Page 18: ...______________________________________________HARRIS 888 9058 001 WARNING Disconnect and lockout AC primary power prior to servicing 18 ...

Page 19: ...______________________________________________HARRIS 888 9058 001 WARNING Disconnect and lockout AC primary power prior to servicing 19 Figure 1 5 Control System Block Diagram ...

Page 20: ...imarily as final amplifiers Each is capable of supplying 1 050 watts RF output either aural CW or visual peak sync PAs are also used as inter stage amplifiers in larger visual cabinets to drive several subsequent parallel PA modules PAs are single stage amplifiers consisting of paralleled class AB amplifiers 1 2 8 2 Driver Modules Driver modules provide high gain Primarily used in preamp applicati...

Page 21: ...o insure the cabinet outputs maintain the proper phase and amplitude relationships when passed to the final hybrid Combiner s The number of phase and gain modules used depends on the number of visual PA cabinets In transmitters with a single visual PA cabinet 15 kW and below no phase and gain modules are necessary The output of the AGC module passes directly to the RF chain Since phase and gain mo...

Page 22: ...W Standard In a 45 kW system one phase and gain module feeds one visual cabinet and a preamp whose output feeds a second phase and gain module Three outputs are thus obtained In high band systems a preamp is inserted in each path at this point and the three outputs pass to the aural PA and visual driver cabinet In low band systems these three preamps are omitted The three outputs are each fed to d...

Page 23: ...ter and modulated onto an IF frequency which is lower than that of the visual IF by an amount equal to the difference between the desired aural and visual carriers The modulator is a voltage controlled oscillator whose center frequency is held constant by a phase locked loop PLL IF group delay correction optional can be used at this point to improve stereo separation in systems where notch diplexe...

Page 24: ...the optional diplexer 20 kW Systems 10 Aural normal The aural AGC module output passes through a phase and gain module Each of the two outputs passes to an aural chain in one of the PA cabinets Once inside the PA cabinets the two signals are sent to driver modules Their outputs are split using two way dividers and the resulting outputs feed an array of four PA modules The two PAs in each cabinet f...

Page 25: ... notch filter notch diplexer optional receives the aural and visual outputs and combines them The output then passes through a harmonic filter to the antenna system 15 60 kW Systems Two harmonic filters are used one in the visual path and one in the aural path The output of the visual harmonic filter feeds a color notch filter The outputs of the aural harmonic and visual color notch filters feed a...

Page 26: ...t of the control cabinet The RF drive levels to the PA cabinet input s are in the 25 to 100mW range 1 3 2 1 Exciter Switcher If optional dual exciters and an Exciter switcher are used both exciters are fed video and the appropriate sound signals Each Exciter s RF output feeds a logic controlled coax switch The selected Exciter signal in a single PA cabinet system then goes to the AGC When more tha...

Page 27: ...al cabinet configurations 1 3 5 50 Volt Power Supply These regulated supplies convert the AC power to 50 volts DC for the RF amplifier modules Each is rated at 300 amps and designed to accommodate 10 to 20 power line voltage changes Internal supply fault protection is interfaced to the slave controller The PTCD5P1i has one supply Larger PA cabinets have two 50 volt power supplies The supply uses S...

Page 28: ...require filtering and phasing networks to remove unwanted frequencies in the RF samples This is critical for RTAC samples 1 4 Platinum RF Combining Parameters 1 4 1 01 Two PA Cabinets The parameters for the two cabinet system are easy to determine by applying the hybrid rules for division and combining to determine how to calibrate the cabinet power levels and the reject load wattage When one cabi...

Page 29: ... can be used to calibrate the power metering for the cabinet and reject loads This is assuming the phase and gain controls have minimized the amount of reject power and the cabinets output powers are about the same 1 4 0 4 Drive Power Meter Calibration The drive levels can be calibrated using the drive directional coupler element The Agilent power meter has a offset feature enter the coupling rati...

Page 30: ...______________________________________________HARRIS 888 9058 001 WARNING Disconnect and lockout AC primary power prior to servicing 30 1 3 Specifications ...

Page 31: ...______________________________________________HARRIS 888 9058 001 WARNING Disconnect and lockout AC primary power prior to servicing 31 ...

Page 32: ...______________________________________________HARRIS 888 9058 001 WARNING Disconnect and lockout AC primary power prior to servicing 32 ...

Page 33: ...ase of a new transmitter Study equipment manuals beforehand and become thoroughly familiar with the installation requirements for each piece of equipment The transmitter equipment installation phases should be planned carefully before the equipment arrives and a detailed plan worked out and written down Know what installation equipment and materials Harris is supplying with the transmitter and wha...

Page 34: ...imary power is not available f In an existing facility must an existing transmitter remain on the air during installation of the new equipment Plan how this is to be done to minimize off air time g A staging area should be chosen and set aside to place the boxes and crates that contain all the smaller parts and assemblies not shipped attached to the transmitter A separate area should be used to st...

Page 35: ...in the drawings Planning for the transmitter room should allow space for program input monitoring remote control and test equipment as well as the transmitter Additional area may also be required for tower lighting HVAC equipment storage and a workbench 2 2 1 Weights Weights are listed below each cabinet on the Transmitter Outline drawing Be sure to include this information in your planning for th...

Page 36: ...eight to properly handle exhaust air as shown is 12 feet The outline drawing also shows a typical air intake and pre filter system Minimum air flow requirements are 3 500 CFM per PA cabinet The intake blower should be sized to provide slight positive room pressure A manometer installed to sense pressure drop across the filters can be used to indicate when pre filter replacement is due If the exist...

Page 37: ...urce of input power For this reason the primary power for the transmitter should originate at the main power distribution system and remain isolated from other electrical distributions All wiring and signal inputs are at the top of the cabinets Overhead cabling is used No access is provided in the cabinet floors for under floor or trench wiring AC power to the transmitter should be run in metallic...

Page 38: ... Transformer Loading Any other loads connected to the isolation transformer especially from line to neutral may not tolerate the sine wave distortion inherent in an isolation transformer The feed line to the transformer must be protected by a main line circuit breaker to protect against a transformer short Individual cabinets are protected by branch breakers 2 3 Unpacking and Equipment Inventory 2...

Page 39: ...king and inventory 2 3 2 Inventory and Inspection 2 3 2 1 Packing Check List Each transmitter shipment will be accompanied by a packing check list identifying which equipment is packed in the various crates and boxes Be sure to locate this document when the shipment arrives The contents of the shipment should be as indicated on the packing lists If the contents are incomplete or if any part is dam...

Page 40: ...wo people wearing gloves should support the door while the third person removes the hinge pins starting at the bottom and working up Then the door may be set aside and rollers pipe and a ramp used to remove the cabinet from the skid WARNING SLIDE CABINET OFF TO THE FRONT OR BACK OF SKID NOT THE SIDE TO AVOID BENDING BOTTOM PANEL Replace the door after the cabinet is set in place Have two people po...

Page 41: ...pounds 205 kg Use a mechanical lifting device to remove them from the skid Two access holes in the top are provided to attach lifting eyes to the transformer Use a spreader bar to prevent bending the lifting eyes NOTE The center of gravity is close to in line with lifting eye bolt holes The power supplies are furnished with two metal wheels for easy movement and installation in the transmitter Rol...

Page 42: ...onnects to phase A on all supplies etc All logic must be powered from the same phase The power for the control cabinet is fed through the conduit hole in the left rear top of the cabinet There is an option that requires a dual AC mains feed The three phase power runs to the terminal block s mounted on the left wall of cabinet Again the safety shield must be removed before installation and replaced...

Page 43: ...Interlocks and Interfaces External and fail safe interlocks are connected to the I O panel Refer to the Cabinet Interconnect drawing and or the control cabinet wiring diagram 2 13 1 External Interlock TB1 1 2 When normally closed interlock switches open the external interlock prevents the transmitter from being started up If opened during operation the transmitter switches the transmitter off Re c...

Page 44: ...interlock 2 13 4 External Blower Control K2 part of the I O panel contains 4 form C contacts connect external blower contactors or air conditioning controls as needed WARNING WIRING ABOVE 48 VOLTS MAY INTRODUCE A SAFETY HAZARD 24 VOLT AC COIL CONTACTORS ARE SUGGESTED They may be used for air system contactor control as desired The contacts are rated 5 amps 2 13 5 RF Samples The metering RF samples...

Page 45: ...r placed in the 1 2 position which will supply 5 volts from the internal supply for the optocouplers If JP2 is placed in the 2 3 position the optocouplers must be supplied a voltage on pins 19 37 of J31 The optocouplers require a minimum current of 5 mA and the maximum current should be less than 20 mA Open circuit voltage with the internal source JP2 1 2 is 5 volts Any external source JP2 2 3 sho...

Page 46: ...d the switcher will automatically switch to the alternate exciter if not in a foldback or muted state 2 14 1 2 J32 Status Outputs The Status outputs are N Channel enhancement mode FETs with a 10 Ohm resistor in series and a 30 volt zener avalanche diode clamp to ground An internal voltage source of 5volts can be made available to the outputs by placing main controller optional status jumper JP3 in...

Page 47: ... removing the control input cable VSWR FOLDBACK ACTIVE Indicates antenna VSWR has caused the transmitter to reduce its output power by some amount It will be asserted low while the foldback is active VSWR FAULT A sudden major increase in reflected power has created a VSWR fault EXTERNAL INTERLOCK Indicates the status of the external interlock If the interlock is open a low will be asserted PHASE L...

Page 48: ...RWARD POWER 0 3 0 VOLT 0 100 2 VISUAL VSWR 1 0 2 0 VOLTS 1 0 2 0 VSWR 3 AURAL FORWARD POWER 0 3 0 VOLTS 0 100 4 AURAL VSWR 1 2 0 VOLTS 1 0 2 0 VSWR 5 REJECT LOAD 1 POWER 0 2 5 VOLTS 0 TO MAX REJECT POWER 6 REJECT LOAD 2 POWER 0 2 5 VOLTS 0 TO MAX REJECT POWER 7 REJECT LOAD 3 POWER 0 2 5 VOLTS 0 TO MAX REJECT POWER 8 VISUAL FORWARD POWER 0 2 5 VOLTS 0 100 POWER1 0 1 8 VOLTS 0 100 POWER2 9 AURAL FOR...

Page 49: ...INSPECT THE TRANSMITTER FOR AC POWER SHORTS LOOSE HARDWARE WIRING ERRORS UNCONNECTED WIRES MISSING PARTS AND DEBRIS The following procedures are the sequential steps to safely turn on the transmitter for the first time and should be performed in the order listed It is recommended that the installation personnel read the general description in section one the controls and operation material in sect...

Page 50: ...low voltage or improper phase sequence to generate a logic fault NOTE All cabinets must be phased the same Correct phasing of each PA cabinet is a part of the PA cabinet Operational Checkout The low voltage and phase sequence sensor in the control cabinet will protect all cabinets from most AC power line problems 2 15 1 2 GUI Setup STEP 1 Power up the GUI with the AC from the UPS The GUI computer ...

Page 51: ... on and the transmitter should shut off Press ON button The transmitter should not come on Re close the circuit The external interlock status indication should go out The transmitter should come back on if the setup selection is auto restart If setup option is lockout the transmitter should not come back on until a manual ON command is given STEP 6 Check operation of RAISE and LOWER buttons both o...

Page 52: ...heck all slave controller supply voltages at slave controller J4 J4 5 is 12 volts J4 6 is 12 volts J4 1 and 2 are 5 volts STEP 5 Press cabinet ON You should hear the contactor energize Air loss PS 1 and PS 2 LED s should be illuminated PS 2 may not be used Press cabinet OFF WARNING BEFORE CHANGING CABINET AC WIRING IN THE FOLLOWING STEP IF NECESSARY ENSURE THAT ALL AC POWER IS REMOVED FROM CABINET...

Page 53: ...mber and slot number Low band PA cabinets have Driver and Power Amplifier Modules High Band PA Cabinets have three types of modules Drivers PA Drivers and PAs The drivers are keyed and will not fit into a PA slot Although each type is interchangeable and will work in any like socket when starting out it is best to reassemble them in the same locations as tested Keep a record of any changes for fut...

Page 54: ...e Re enable the module by pressing transmitter ON at the control cabinet The MODULE FAULT on the control cabinet should go out DELETE the alarm from the queue Repeat for each module in turn 2 16 Initial Application of RF Power 2 16 1 Initial Application of RF Visual Power STEP 1 Check to insure the AGC module is OFF STEP 2 LOWER the exciter to minimum drive STEP 3 Press transmitter ON push button ...

Page 55: ...ustments to the phase and gain module controls as above if necessary Note that the second half of the green LED on each visual PA module illuminates indicating presence of RF drive STEP 12 Compare DC INPUT POWER and 50 volt supply currents to factory test data STEP 13 Check all PA modules for output one at a time by squeezing the disable switch for each module and noting a drop in power output of ...

Page 56: ...le phase control for minimum reject power STEP 8 Adjust gain control for minimum reject power STEP 9 This completes the phase and gain module alignment in two PA system For larger systems proceed to the next phase and gain module STEP 10 Using an external power meter or calorimetric metering to confirm power output slowly increase power to 25 NOTE If external power meter and user display panel rea...

Page 57: ...g input to the PA Cabinet slave controller has more latitude as there is a range adjustment control for each of the RF detectors This allows the full scale RF level range to be set to three volts at the peak detector test point Further calibration will be done through the GUI service screen 2 17 2 Visual Power Calibration 2 17 2 1 System Forward Power Some of the power calibrations are based on fo...

Page 58: ...service button to access and set the PA power levels 2 17 2 4 Two Cabinet Reject Load The power in the reject load is half of a single cabinet with perfect hybrids If the level measured at the top of the control cabinet is in the 40 to 60 mW range calibrate the reject load to be 80 percent of the reject load rating 2 17 2 5 Three and Four Cabinet Calibration Using the tables below calibrate the re...

Page 59: ...sample controller input Rotate the reflected sample element to couple with forward power STEP 2 Verify the RF level 40 to 60mW STEP 3 Connect the 20 dB pad to the reflected input connect the cable to the pad STEP 4 Use the service screen to calibrate the reflected power metering to read one percent of the forward power STEP 5 Remove the pad and reconnect the cable 2 17 3 3 PA Cabinet Power Calibra...

Page 60: ...alibration VSWR calibration follows forward and reflected power calibration The VSWR foldback will limit the reflected power to a fixed value The VSWR foldback will limit the reflected power to a fixed value the 1 22 1 value is 1 of the normal forward power An example is a 2 cabinet PA that has a normal forward power of 6 2 KW The foldback will limit the reflected power to 62 Watts The second line...

Page 61: ...et PA that has a normal forward power of 6 2 KW The foldback will limit the reflected power to 62 Watts The second line of protection is the module internal VSWR protection Modules will always VSWR protect using the module logic IF you have confidence in the power calibration you can let the software use the default values of 1 22 1 as the foldback fault point and 1 40 1 for VSWR fault Other value...

Page 62: ...nd lockout AC primary power prior to servicing 62 2 20 Power Limit The exciter has a power limit adjustment Increase the output power to 110 The exciter power limit should be set to limit the transmitter power to 110 At 110 power note the exciter power and enter this value as power limit ...

Page 63: ...ction eCDi is Transmitter Network Interface that provides a network connection for control and monitoring of Harris Platinum i transmitters WARNING ECDI IS A REMOTE CONTROL DEVICE MAINTENANCE PERSONNEL SHOULD TAKE ALL NECESSARY PRECAUTIONS TO DISABLE THE ECDI DURING TRANSMITTER MAINTENANCE SPECIFICALLY THE TRANSMITTER SHOULD BE PLACED IN THE REMOTE DISABLE LOCAL MODE BEFORE SERVICING ALWAYS DISCON...

Page 64: ...erface Netscape or IE The only other software required is a Java plug in and it is downloaded from the eCDi the first time a computer accesses the unit Performance Monitoring An optional software upgrade provides for performance monitoring of DTV transmitters by networking an embedded version of the CD EYE application Common Interface The Web GUI creates a common display platform for all transmitt...

Page 65: ...GUI Graphical User Interface The Web GUI allows broadcasters to control and monitor their transmitter s through a standard web browser Netscape or IE from anywhere network access is available This is the standard interface supplied with all eCDi units An example of the Web GUI main screen is shown in Figure 3 1 This main menu structure and layout is basically the same for all transmitters allowing...

Page 66: ...lized control and monitoring of multiple transmitters and sites but does not come with eCDi NOTE The eCDi can also be accessed by other non Harris SNMP Network Managers In this case the MIB Management Information Base is a common MIB that is used by nearly all Harris transmitters A second Extended MIB exists and is exclusively used by the Harris Broadcast Manager 3 5 Level 1 Level 2 Functionality ...

Page 67: ...ctor is for serial connection to CD 1A exciters in DTV transmitters To connect 2 exciters this cable must have a Y adaptor installed d The 2 Ethernet connections labeled EX1 and EX2 will be connected primarily to exciters with ethernet ports such as APEX 3 6 Security eCDi provides password protection using 3 levels of security functionality 1 Engineer allows access to all functions 2 Operator allo...

Page 68: ...s ME Windows 2000 with Service Pack 2 or newer Windows XP Web Browser Internet Explorer 5 5 or higher with default security permissions Netscape 7 0 or higher NOTE Microsoft DirectX 7 0 or later is highly recommended comes pre installed on Windows 2000 and Windows XP 3 8 Setup The information contained in this section is intended to explain the following Connection of all required cables between t...

Page 69: ... to the most current release levels at the same time Failure to update all 4 to the levels on the upgrade disk or CD could cause operational conflicts 3 10 CD 1A Electronic Serial Number Reset The CD 1A has an Electronic Serial number or ESN If this has been set to something other than the factory default value this normally only happens if the CD EYE program has been used with the CD 1A it must t...

Page 70: ... a fixed IP address of 192 168 217 254 or a name of ecdi local on all units STEP 1 The eCDi supports DHCP which means the computer to be connected for configuration can be set to Obtain an IP Address Automatically as shown in Figure 3 3 In this mode eCDi will assign the remote computer an IP address when it connects Right click on Network Neighborhood and select Properties This can also be accesse...

Page 71: ...or Netscape and type one of the following into the Address bar of the browser and press Enter these addresses are only implemented in eCDi software revision 2 6 K and above http 192 168 217 254 http ecdi local this is a fixed eCDi domain name on the configuration port NOTE If you have an eCDi software revision before 2 6 K then the configuration port IP address is http 192 168 0 254 This will brin...

Page 72: ...an occur if the computer fails to release it old IP address To check this Do not type the quote marks a Open a DOS Prompt and type ipconfig and press enter This should return an IP address in the range of 192 168 217 1 to 192 168 217 49 If not then in the same DOS window type ipconfig release and press enter Then type ipconfig renew and press enter b Type ipconfig again to verify an address has be...

Page 73: ...se the following IP address as shown to the right Then enter the IP address 192 168 217 1 with a subnet mask of 255 255 255 0 this address is only valid if you have eCDi software revision 2 6 K or higher Try Step 2 again If it still does not work try several different ethernet cables NOTE If you have an eCDi software revision before 2 6 K then enter you must set a fixed IP address of 192 168 0 1 w...

Page 74: ...tions to load the plug in This will not require a computer restart and will only happen the first time a computer logs on to eCDi Figure 3 5 Java 2 Runtime Environment Plug in To get the computer to use the latest plug in it is sometimes necessary to unload all previous versions of the Java Runtime Environment using Add Remove programs in the Windows Control Panel Once all versions are removed acc...

Page 75: ...n Administrator password required STEP 4 Type in the following and then press OK User Name admin Password admin This can and should be changed immediately once the configuration screens are accessed STEP 5 When the login is accepted the main menu will appear as shown in Figure 3 7 Click on General to open the screen in Figure 3 8 Figure 3 7 Main Configuration Menu Screen ...

Page 76: ...nfiguration screens STEP 7 Set the Location of the box and or any call letters This is used by the browser applet email and SNMP STEP 8 Set the correct time and date This information is used for time stamping of the metering and fault logs Use the pull down menu to select the appropriate time zone STEP 9 Time Server IP recommended If there is a time server available on the local network it will be...

Page 77: ...are and features are displayed Depending on the transmitter type chosen by the feature key you may also need to select the correct type of exciter for each exciter position If you change the exciter selection click on Submit to finish the Feature Key configuration The Feature Key is an encrypted code word that contains all of the hardware configuration such as transmitter type and any add on featu...

Page 78: ...nsmitter control access level Engineer provides access to all Web GUI screens and control functions Operator provides access to all GUI screens but limits functionality to basic On Off Raise and Lower power these functions depend on the transmitter Monitor provides access to all screens but prevents any transmitter control NOTE Passwords are case sensitive but Usernames are not Factory default nam...

Page 79: ...c and manually enter at least the IP Address and the Subnet mask Figure 3 11 Network Configuration Screen STEP 17 When all changes are made press Submit and then press Back to return to the main menu Click on SNMP to access the screen in Figure 3 12 IMPORTANT The SNMP Configuration screen only needs to be set up if an SNMP Network Manager is going to be used to access the eCDi If the web browser i...

Page 80: ...NABLE SET checkbox sets this eCDi to accept SNMP SET remote control commands this is a high security risk unless SNMP V3 is used Un checking this box means that an SNMP manager will only be able to provide status and monitoring GET commands STEP 21 Select the appropriate version of traps for your SNMP system by selecting v1 Traps or v2 Traps SNMP Version 1 or SNMP Version 2 Figure 3 12 SNMP Config...

Page 81: ...uthentication and encryption or select Noauth and Noenc for no authorization or encryption STEP 25 Lastly select the V3 only checkbox to prevent V1 and V2 logins that would bypass the username and password security of V3 Figure 3 13 SNMP v3 Setup STEP 26 When all changes are made press Submit and then press Back to return to the main menu Click on Email to access the screen in Figure 3 14 STEP 27 ...

Page 82: ...and the eCDi email address The email address is used as the sender address so recipients know from where the email was sent STEP 29 If your mail server requires authentication then check the Requires Auth checkbox and enter a User Name and Password for each address Figure 3 14 Email Configuration Screen STEP 30 Set Email Filters Email filters provide a way to block or limit the alert emails being ...

Page 83: ...egory i e only summary indications will send an alert email Selecting All will block all emails for that category This is most commonly used for the Info category since these are mostly Status indications NOTE Checking the Local Mode checkbox will disable all email alerts when the transmitter is in Local mode or Remote Disable as the case may be STEP 31 When all changes are made press Submit and t...

Page 84: ...e several minutes to obtain the encryption key Allow Save Credentials checkbox enables checked and disables unchecked the Save Credentials checkbox on the eCDi login screen shown in Figure 3 4 and at the below In other words if the Allow Save Credentials checkbox is not checked in the Applet Configuration screen then the Save Credentials function on the login screen is grayed out and not functiona...

Page 85: ...y to be entered into the Fault Log Selecting Sum will block all Summary indications in the selected category All other indications in that category will be entered into the Fault Log Selecting All but Sum the most common selection will block all entries but the Summary indications for the selected category i e only summary indications will be entered into the Fault Log Selecting All will block all...

Page 86: ...Figure 3 18 Meterlog and Performance Monitoring Configuration Screens 3 11 2 Apply Changes Once all of the Configuration information is entered on the individual screens you must click on Apply to actually send the changes to the eCDi The Apply button is on the Main Configuration menu shown in Figure 3 19 As stated previously this will also cause test emails and SNMP trap messages to be sent to al...

Page 87: ... opening the file To view the file in a text editor make a copy of the file and change the extension to ecdi_config txt Changing the original file name is not recommended since the Upload function will only load a file with the default name ecdi_config zip To save multiple config files save each file in a different subdirectory NOTE To reset the eCDi to the default configuration settings press the...

Page 88: ...217 254 subnet mask of 255 255 255 0 If you are using DHCP on the remote computer which is connecting to the eCDi then no changes are required to connect If you are using a fixed IP address to access the eCDi then set the IP address of the remote computer to 192 168 217 1 For more information see 3 12 eCDi Configuration on page 3 11 Exciter 1 192 168 217 200 Exciter 2 192 168 217 201 3 12 1 Updati...

Page 89: ... and lockout AC primary power prior to servicing 89 STEP 1 Open a connection to the eCDi This will bring up the screen shown in Figure 3 20 Click on Service eCDi upper left portion of the screen and then select Upgrade This will open the window in Figure 3 21 Figure 3 20 Upgrade Login ...

Page 90: ...ure 3 22 Default User Name admin Default Password admin Figure 3 21 Administrator Login STEP 3 Browse for the upgrade file eCDi bin and then click on Submit This will upload the file to the eCDi and start the upgrade process Figure 3 22 eCDi Upgrade Screen NOTE The upgrade process is automatic Once the new software is uploaded it will take about 2 minutes to finish the upgrade The eCDi will not be...

Page 91: ...OM port which you connected in step 2 5 Select the baud rate 19200 6 Double click on the microcontroller 0 icon in the upper left portion of the screen 7 De select the Use Uploader file check box by clicking on it 8 In the Select Application File box select the PLAT2_CTRL _APP_VVVV S19 file 9 Click on the Program button 10 A dialog box will appear which reads The application file selected appears ...

Page 92: ...____________________________HARRIS 888 9058 001 WARNING Disconnect and lockout AC primary power prior to servicing 92 3 14 Exciter Switcher Optional Figure 3 19 Optional Exciter Switcher Table 3 1 Optional Exciter Switch ...

Page 93: ...N 1 Reduce transmitter power to 50 2 Set AGC MODE switch to OFF 3 Raise transmitter power back to 100 4 Set AGC MODE switch to ON 5 Verify AGC action reduces transmitter power 6 If AGC does not reduce transmitter power contact maintenance personnel and have them set AGC per section 3 19 at the end of this chapter Figure 3 24 AGC Module Table 3 2 AGC Module Controls and Indicators ...

Page 94: ...____________________________________HARRIS 888 9058 001 WARNING Disconnect and lockout AC primary power prior to servicing 94 Figure 3 25 HX 1V Exciter Front Panel Table 3 3 HX 1V Exciter Controls and Indicators ...

Page 95: ...6 3 17 2 1 Green Bar LED Indicates AC power present to cabinet and controller and 12 V supply is operating 3 17 2 2 Red Bar LED Summary fault indicator is illuminated when any one or more of the slave controller faults in sensed Opening the front panel reveals LED indicators for the various types of faults 3 17 2 3 Door Open Rear cabinet door is open or SCR crowbar is firing 3 17 2 4 Air Loss Fan ...

Page 96: ...ible while the control cabinet main controller is in the OFF state and sending this OFF command to the slave controller Removing the cable at J 2 disables the main controller s authority over the slave controller allowing independent control 3 17 2 9 Cabinet ON LED Indicates cabinet ON status 3 17 2 10 Cabinet Off Switch A local OFF switch for emergency use and troubleshooting It will shut the cab...

Page 97: ...uminate and show a fault code as described below or lack of 50 volt supply If the module is replaced after removal a transmitterONcommand is needed to cancel the mechanical disable and re enable the module In some cases where transmitter power is significantly less that 30 kW the PA modules used in the driver stage may be operating at a low power level and therefore illuminate only half of the gre...

Page 98: ...f events ON commands are sent to the amplifier cabinets AC contactors are energized and the exciter is unmuted When the fans provide sufficient air to close the air pressure sense switches the 50 volt DC supplies are enabled The RF amplifier modules are enabled when the DC supply reaches 48 volts Transmitter output will revert to the power level last selected by the exciter controller The system w...

Page 99: ...doubt as to the exciter level setting exists depress and hold the LOWER command for about 15 seconds to assure a safe low drive condition upon turn on The RAISE LOWER controls are dual speed controls The rate of power level change will be slow for the first few seconds after a button is pressed and held The power level will change at a faster rate if the button is held down longer To return to the...

Page 100: ...smitter power is 100 i Adjust SET pot to reduce transmitter power to about 70 for room temperatures near 70 F If room temperature is near 110 F adjust to 95 and if near 50 F adjust for 65 j Increase exciter drive to 100 power When the room is cold if there are problems with module overdrive faults when turning the transmitter ON adjust SET pot for less power reduction If the transmitter sample vol...

Page 101: ...ol the transmitter with the same graphical user interface The GUI is a control interface the transmitter control system will continue to function even if the GUI is not functioning 4 1 2 376 Micro Controller The intermediate level of control is the 376 micro module This controller board is responsible for Transmitter ON OFF functions PA cabinet interface Basic transmitter control using the front p...

Page 102: ...upport functionality This life support function is controlled by a watchdog circuit triggered when the 376 micro is unresponsive The CPLD will control the transmitter ON OFF state It will respond to front panel and customer parallel remote commands The RF detector outputs will be monitored compared to references to protect the transmitter from fault conditions It also serves as memory mapped I O t...

Page 103: ...ed off command from remote control If this failure happens the only remedy is the disconnection of the faulty control connection These critical functions are hard wired to the CPLD Controller inputs The other buttons and indicators are controlled by the microprocessor and other support circuits that are part of this control panel assembly 4 2 2 STATUS Indicators Pushbuttons These buttons illuminat...

Page 104: ...e handles at each end of the control panel to pull the top of the panel forward it will rotate on a bottom hinge allowing access to more buttons and indicator LEDs These buttons and indicators are backup for the GUI interface The control functions are The top row allows independent ON OFF control of each PA cabinet The LED indicator above each button indicates the state of the cabinet Green indica...

Page 105: ...the eCDi GUI interface as a computer program IMPORTANT The section 2 4 3 in the GUI manual applies to the older versions of Platinum transmitters and should not be used with the new Platinum i version The eCDi manual shall be used for functional eCDi information and this manual shall be used for operator information using the actual Platinum i GUI screens The transmitter eCDi computer will automat...

Page 106: ...re 4 3 Network Log On Screen This screen will appear after the network computer finishes the log on sequence Operator will enter user name and password to access the program The default user name is HARRIS and there is no password until one is set NOTE The screens shown for illustration are typical they will change due to transmitter configuration and software versions ...

Page 107: ... complex multiple screens Other Layers pages include but are not limited to The SFMCS Layer Summary Faults Meters Control Service buttons The Cab ID Layer Cab ID 1 Cab ID 2 etc buttons located on the lower left side of the main screen section above the Tabs The System Cabinets Layer Ex Found in the P S screen when activating the Meters button When viewing a Tab screen in our example the Drive Tab ...

Page 108: ...ummary ________Faults _________Cab ID 1 _________Cab ID 2 _ _ _ _ _ _ ________Meters _________Cab ID 3 _ _ _ _ ________Control ________Service ___________Output ________Summary ________Faults ________Meters ________Control ________Service ____________P S ________Summary ________Faults ________Meters ____________________System Cabinets ________Cab ID 1 NOTE On this HT30 example only the Visual PA C...

Page 109: ...n to red it indicates a fault and picking that red tab will take you to that fault screen The symbol indicates that pushing that button opens a page with more information sometimes called a drill down button The bottom left screen is called the fault log in reality it is an event log logging events that are a change in status Active faults are indicated by the event having a red background A yello...

Page 110: ...r trip point set by EEProm through uC LVPS Low LVPS 10 LVPS High LVPS 10 VSWR Visual Foldback Occurs when the visual VSWR reaches 1 2 1 Exciter A Fault Internal to exciter Exciter B Fault Internal to exciter PA Cabinet Air Fault Occurs when PA Cabinet is on and the pressure is below the threshold of the air pressure switch PA Cabinet Door Fault Occurs in PA Cabinets when rear door is open PA Cabin...

Page 111: ...elect either Exciter at any time If automatic Exciter switching is enabled switching manually to an Exciter that is below the 50 RF output threshold will result in an automatic switch back to the original Exciter Changing to manual operation will allow this operation 4 5 Status and Metering Screens Home Screen Page Figure 4 4 The home page displays transmitter ON OFF status remote control status a...

Page 112: ...p Exciter green center is no faults and red center indicates that exciter has a fault The next block to the right is the control block for the Exciter Switcher This is needed for two Exciter systems There are two switching modes manual and automatic Manual mode only responds to operator action In automatic mode the Exciter Switcher logic monitors the RF level If the level is lower than a set point...

Page 113: ...ower prior to servicing 113 Figure 4 7 Drive Tab Meters Button Visual Driver Selected This screen displays the Exciter power and cabinet drive power in watts and percent Figure 4 8 Drive Tab Meters Button AGC Selected This screen meters the AGC control voltage if there is only one AGC the other will meter zero ...

Page 114: ... One additional button allows muting the RF drive by forcing the AGC output to zero Figure 4 10 Drive Tab Service Button This screen allows the maintenance personnel to configure the number of exciters and the number of AGC units Exciter power display can be calibrated to match the power meter on the Exciter front panel Push Cabinet Drive Power button for next screen Cabinet nominal power can be e...

Page 115: ...wer Amplifiers Tab Figure 4 11 P A Tab Summary Button This screen in PA Summary mode shows the power output of each PA cabinet The button below each meter will switch to a detailed metering display of that particular PA Cabinet Figure 4 12 P A Tab Faults Button This screen displays Power Amplifier faults that can occur They include Module faults ...

Page 116: ...hen the fault is active Buttons across the bottom allow cabinet selection The Cab ID shows the slave controller ID for the cabinet selected by the Cab ID select buttons Figure 4 13 P A Tab Meter Button Another screen to meter each PA cabinet output power cabinet reflected power drive Power voltage and current of each 50 volt supply The top row of buttons select the cabinet in multiple PA systems T...

Page 117: ...lockout AC primary power prior to servicing 117 Figure 4 14 P A Tab Control Button This screen allows individual ON or OFF commands to be sent to each PA Cabinet Figure 4 15 P A Tab Service Button Cab ID 3 Selected This screen is used to calibrate the individual cabinet metering parameters ...

Page 118: ...Output Tab Figure 4 16 Output Tab Summary Button This page displays metering of the system Output power Reflected power and calculated VSWR It also displays the power output of each PA Cabinet Figure 4 17 Output Tab Faults Button Output Tab Faults lists possible faults at the system level System Forward Power VSWR Trip and VSWR Foldback status ...

Page 119: ... 0 volts DC at the above test points Mute status a System control mute b Mute Fault due to operation of the RF coax switches During operation of the switches drive will be muted Should a switch fail to complete a transfer the drive will remain muted as controlled by the coax transfer switch interlock system Figure 4 18 Output Tab Meters Button Readings of system output power reflected power and VS...

Page 120: ... switches are active the position buttons will operate the RF switches and illuminate to indicate position and RF switch interlock status Figure 4 20 Output Tab Service Button System Visual Selected This screen is used to calibrate the System Visual power metering and reject loads Determine the proper forward power using the RF power meter and the precision calibrated coupler The offset can be ent...

Page 121: ...rning off cabinets using the hybrid power division rules Knowing the theoretical reject power then calibrate the reject power as a percentage of the reject load power rating Refer to Drawing 801 0210 011 sheet 13 Once the proper reflected power calibration is done the desired VSWR fault and foldback values can be selected VSWR control is software based and no further calibration is needed The actu...

Page 122: ...ure 4 22 Output Tab Service Button RF Switch Selected When the RF switches are enabled the RF coax switch control buttons will appear on the output control screen 4 5 4 P S Power Supply Tab Figure 4 23 P S Power Supply Tab Summary Button Screen displays AC Mains Logic supply voltages and 50 Volt supply OK status Green illumination means OK ...

Page 123: ...cing 123 Figure 4 24 P S Tab Faults Button This screen displays AC mains voltage sensor status A fault indicates low line voltage or the phase sequence is reversed Figure 4 25 P S Tab Meters Button System Selected This screen meters the control cabinet AC line voltages and Logic supply voltages when the System button is selected ...

Page 124: ...4 Figure 4 26 P S Tab Meters Button Cabinets Selected Meters the 50 Volt Module Supplies for each PA Cabinet Select the PA Cabinet using the Cab ID buttons Figure 4 27 P S Tab Service Button The power line voltage calibration is done on this screen The other function is the setting of a nominal AC line voltage this scales the bargraph ...

Page 125: ...rior to servicing 125 4 5 5 System Tab Figure 4 28 System Tab Summary Button Status of transmitter remote control external interlocks and cabinet communication Figure 4 29 System Tab Faults Button This screen displays system fault areas monitored and are normally displayed in green Actual active faults change to red ...

Page 126: ...nal Interlock selects a choice of transmitter functions following an external interlock open and restore cycle Auto Restart turns the transmitter back on following an opening and re closure of the external interlock The manual selection requires an operator ON command to restart the transmitter Auto restart is the normal mode unless safety regulations require manual restart Revision is the board a...

Page 127: ...ly card for fault display 50V Power Supply 2 Check power supply card for fault display OUTPUT System Forward Power Little or no output power Y VSWR Trip Software set High reflected power VSWR Foldback Software set moderate reflected power Y Reject Loads Reject 1 Reject load power exceeds load rating Y Reject 2 Reject load power exceeds load rating Y Reject 3 Reject load power exceeds load rating Y...

Page 128: ...______________________________________________HARRIS 888 9058 001 WARNING Disconnect and lockout AC primary power prior to servicing 128 NOTES ...

Page 129: ...ctive and inactive state and a unique name within the system To differentiate between active high or active low logic states on the schematics a forward slash is placed in front of an active LOW signal name such as RF_MUTE This means that if this logic line is pulled low the transmitter RF will be muted By the same logic the signal RF_MUTE_LED an active high signal with no forward slash will turn ...

Page 130: ...______________________________________________HARRIS 888 9058 001 WARNING Disconnect and lockout AC primary power prior to servicing 130 Figure 5 1 Controller Block Diagram ...

Page 131: ...ring of every data point within the transmitter It includes an SNMP Simple Network Management Protocol manager and allows integration with most Control Systems via the Internet or LAN 5 2 1 Micro Module The control board in the transmitter uses the 376 Micro Module The micro module is a daughter board with a standardized interface which is plugged into a motherboard It contains Flash memory for st...

Page 132: ...t the CPLD will continue to monitor and protect the systems to which it is connected even if the micro module fails However there will be no reporting of information to the rest of the transmitter system since access to the CAN bus is gone without the micro module 5 2 2 CPLD Complex Programmable Logic Device The transmitter control board with the micro module also incorporate a CPLD Complex Progra...

Page 133: ...age and over temperature protections A CAN transceiver connected to the CAN bus is considered a Node There can be up to 110 nodes on the bus with a maximum bus length of about 40 meters for 1Mbps operation In a CAN system data is transmitted and received using Message Frames Message Frames carry data from a transmitting node to one or more receiving nodes The messages transmitted from any node on ...

Page 134: ...n to normal operation This command is basically a RESET pulse which will try to turn on any transmitter components which have faulted off due to a critical fault condition If they are still faulty this will be detected and the component will simply be shut off again This will not reset or clear the Fault Log c FLT_OFF This command is initiated whenever a fault occurs that requires all RF to be shu...

Page 135: ... equivalent to 1 4 of a VGA display This is the primary local interface for the operator but is not required to operate the transmitter The primary operator controls ON OFF RAISE LOWER are located on the front panel next to the GUI Operation and navigation of the GUI is covered in Section 4 of this manual 5 3 1 2 Remote Controls There are 3 remote control and monitoring options which can all acces...

Page 136: ...sor control board which is capable of operating and protecting its own area Each of the control boards only need to get on off commands from the switch panel In the driver the local control bus provides parallel lines which connect its switch panel to the RFU controller the mode controller and the external I O boards The system bus provides other parallel lines which pass critical information A pi...

Page 137: ...occurred and in what function Green is Normal Orange is Warning and Red is Fault The hot buttons include the following Drive Chain Power Amp Output Power Supply System and Performance By pressing these buttons the user can open the appropriate screen on the display see Figure 6 15 ISP In System Programming The process used to update firmware software on a board without having to change physical co...

Page 138: ...at particular row This will cause the MAX 6954 to send an interrupt to the micro controller The micro controller will then pull the information from all 4 debounced registers and decode them to determine which switch in that row was pressed Once this is determined it blinks the LEDs for that button and then it immediately sends the information to the controller that is responsible for that switch ...

Page 139: ...tates of the six control buttons are as follows Blinking for any color indicates a change of state is in progress Off button has no illuminating color Power Raise Power Lower and Remote Disable buttons light solid Orange when on and blinking Orange while a change of state is in progress Transmitter On and Remote Enable buttons light solid Green when on and blinking Green while a change of state is...

Page 140: ...messages 5 4 2 4 1 FP Error This error is displayed when the front panel determines that a hardwired button has been pressed for longer then 30 seconds This is to alert the operator so that the condition can be corrected immediately This condition is caused by either a sticking button or by something leaning against the button The only exception to this is the power raise and power lower buttons 5...

Page 141: ...he last known Exciter state upon power up If the micro is unresponsive the last known mode will be maintained 5 4 3 1 Status Indicators A Red LED will indicate a Board Reset A Red LED will indicate if the CPLD is not programmed A Red LED will indicate that the External I O has Faulted Off the Tx A Red LED will indicate that the External I O has RF Muted the Tx There are 8 Green LEDs used for debug...

Page 142: ...rs provides drive to a front panel status indicator and has a local ON arid OFF pair of buttons which may be used to operate the PA cabinet independently of the main controller if the control cable is disconnected Internal logic in the PA controller controls the application of ON commands to the Power Amplifier cabinets 5 4 4 Module Logic Each PA and Driver module contains its own Local control lo...

Page 143: ...tile memory storage d A built in clock running at 4 194MHz allowing the micro to run at 16 25MHz Power failure detection A watchdog which will reset the micro if it is not triggered at least every 1 6 seconds this time interval will change depending on the application A discrete logic device or CPLD is provided on the motherboard to act as an I O expansion device and as life support if the micro m...

Page 144: ...nication with exciters The front panel is connected to the main controller using J7 the protection and opamp buffering interface with the CPLD inputs 5 5 1 5 Controller Analog Sense Sheet 5 Sheet 5 includes four analog multiplexer demultiplexer CMOS integrated circuits These select one of eight inputs to an output These chips become four of the analog inputs to the micro module 5 5 1 6 CPLD Sheet ...

Page 145: ...2 can be used to control exhaust fans or other parts of a transmitter cooling system 5 5 1 9 Foldback Voltage D A and Can Bus Interface Sheet 9 The foldback digital to analog converter changes the digital foldback control value to an analog voltage The analog voltage is an input to the exciter I O to control the foldback circuitry of the exciter Provisions include two outputs for analog transmitte...

Page 146: ...only changes with temperature After opamp unity gain buffering the two voltages are inputs to the following differential amplifier the output of this is the difference of the two voltages representing the RF input voltage only This circuit is designed for three volt at the test point at maximum input RF voltage This voltage will be used with a lookup table in software to correct for the diode nonl...

Page 147: ...urnished from U3 a 5 volt DC to DC supply rated at 150 mA maximum 5 5 1 17 Remote Status Output Drivers Sheets 18 and 19 The 74AHCT594 devices contain an 8 bit serial in parallel out shift register that feeds an 8 bit D type storage register Separate clocks and direct overriding clear SRCLR RCLR inputs are provided on both the shift and storage registers U46 is used to change the serial status inf...

Page 148: ...ansceivers U1 U4 is stored in the Cabinet Address Latch U6 and is then compared with the cabinet address selected on S1 by U7 If the address numbers do not match the slave ignores the following data If a match is seen DS1 ADR Select lights briefly and the same signal operates the Read Strobe encoder U8 generating a read strobe on one of 8 output lines based on the low 3 bits of data from the cabin...

Page 149: ...d The PS OK signals are monitored by U18 6 and U18 8 indicated by PS Fault LED S DS3 and D54 Each will show a FAULT condition if the TX ON OFF LATCH is set to ON and it s power supply is not returning a PS OK signal The PS FAULT lights will light briefly each time the PA is operated to ON until the power supplies come on and then will light only if the supply faults A power supply can be reset wit...

Page 150: ...itch to alternate modes in some parallel driver versions of the transmitter 5 6 1 7 Sheet 8 The Module Enable circuits also programmed by PAL IC s which receive the TXD and TXD signals the STSET reset command all MODF and PS SET signals and the EXTINT signal if external interlock is used The PAL s contain the necessary logic to turn the PA modules ON and OFF as commanded or if interlocked and also...

Page 151: ...n the RF path depends on the configuration Single Power Amplifier Cabinet systems do not need phase and gain units The control components in the control cabinet include the GUI eCDi interface computer the main controller and the front control push button panel The exciters have self contained power supplies and the logic and RF control subassemblies utilize DC power supplies in the bottom of the c...

Page 152: ...l use a 480 to 240 volt external step down transformer This is documented with the AC Distribution drawing in the appropriate systems section TB3 and TB4 are shown again at the right edge of sheet 2 with the load wiring For dual power supply systems relays K4 and K5 switch the UPS and the back door fan to the backup AC feed if the main feed is not available The phase monitor relays K1 and K3 have ...

Page 153: ...and sound directional coupler in the exciter switcher option Sheet 2 and 3 AGC Path this directional coupler output is cabled to the AGC input The diagrams on that sheet show the various accessory tray configurations for the different size transmitters The I O panel also has a cable connection to sample the transmitter AGC output Sheet 4 this shows the DC power supply distribution the power suppli...

Page 154: ...is transmitters that have a serial connection port For the Platinum I this includes a local GUI touchscreen interface in addition to its normal networking capabilities This becomes the local transmitter control interface using the attached 12 VGA touchscreen and has been named the Display Unit This means that the eCDi provides both local and remote control for the Platinum i transmitter For more i...

Page 155: ...ive exciter RF level is lower than the level determined by the SET adjustment This level is usually 50 but is adjustable to other values if required The input labeled MUTED acts as a switching inhibit control line to prevent switching when the control system is in mute or VSWR foldback This will not inhibit the manual switching mode 6 4 1 2 Exciter Switcher Relay Board Panel Drwg 839 7900 080 This...

Page 156: ...ges state This threshold point can be changed by adjustment of the SET control The normal set point is 50 of the normal exciter vision output power STEP 3 Note the Exciter A Sound aural power output readings STEP 4 Lower the sound power of the standby exciter Exciter B and observe the sound power level when the RF PRESENCE LED changes state This threshold point can be changed by adjustment of the ...

Page 157: ...able fixed pads followed by a variable hybrid attenuator The normal configuration is 4 dB in the circuit and the other sections are bypassed The attenuator output is followed by a 12 dB fixed attenuator and 15 dB gain amplifier for a net gain of 3dB The amplifier may be bypassed depending on system gain requirements by changing JP4 JP5 and JP6 The output amplifier power limit is 500mW Voltage Cont...

Page 158: ...Adjustment Next repeat steps 1 5 for the sound AGC adjustment 6 4 2 3 Troubleshooting a Gain Test when the AGC is turned off a fixed voltage divider generates a 10 volt level that will set the voltage controlled attenuator to minimum attenuation Use a power meter to measure the input power reconnect the input cable and measure the output power The loss should be approximately 3dB plus the value of...

Page 159: ...ndicate the status of the adjustment ranges Gain Adjustment The GAIN ADJUST R2 on the front panel is a voltage divider between plus 12 volts and ground located on the left side of the drawing of sheet 2 This adjustable voltage is buffered by two opamps in U2 The section of U2 associated with the CHB attenuator inverts the control signal change such that an increase in the control voltage to the CH...

Page 160: ... path The shift in each phase hybrid is controlled by the voltage bias on the KV3901 varicap diodes The varicap diodes are in series with 120pf capacitors C27 C33 C31 and C38 As the varicap diode bias is increased the varicap capacitance value increases presenting a different reactive impedance to the RF signals emanating from hybrids HY1 and HY4 The reflected signal from this reactive impedance i...

Page 161: ...king for further improvement The reject power should be one percent or less when nulled Any red LEDs illuminated indicate end of the control range and troubleshooting is required A three cabinet PA system is adjusted in a similar manner the phase and gain of the pair A B is set first monitoring reject load 1 and once that null is found the AB C is nulled by monitoring reject load 2 A four cabinet ...

Page 162: ...should be unity when the GAIN control is in the center of the range The drawing is well annotated with level information and DC control voltages that help with troubleshooting 6 4 4 UPS Battery Testing Refer to the UPS manual for routine battery testing It is difficult to estimate battery lifetime since it is a function of cycling and ambient temperature The lifetime could be as short as one year ...

Page 163: ...he incoming AC is connected to the line side of the main contactor Wires from the line side go to a printed wiring board containing an array of MOVs for line transient protection Two other wires connect to the logic supply circuit breaker this provides single phase AC power to the power supply for the PA cabinet slave controller logic When this contactor closes three phase AC is connected to the f...

Page 164: ... to allow the current through the SCR to be zero allowing the reset to an open circuit 7 2 1 2 2 Mechanical Shorting Switch When the door opens fully the mechanical shorting switch located at the hinge side of the cabinet will close further discharging the filter capacitors This is independent of the SCR circuit acting as a backup 7 2 2 PA Cabinet Control Logic This is commonly called the slave co...

Page 165: ...s after the power divider HT45HS LS there are two paths combined with an external 3dB hybrid Each path has three PA modules 7 3 3 Combined Sound and Vision 10 KW PA Cabinets The sound path is the same as the HT15HS LS a driver and two PAs In Low Band transmitters the exciter RF output from the AGC or Phase and Gain unit is the input to a Driver module The output of the Driver module is divided 12 ...

Page 166: ...binet the load resistors will absorb some power The amount absorbed is slightly higher when the modules are disconnected and removed than when they are merely shut off This is because removing a module presents an open circuit to that combiner port as opposed to merely disabling the module in which the combiner sees the isolation resistors present in the module s output combiner The amount of powe...

Page 167: ...ission lines present a short circuit to reject loads R1 through R4 placing them at virtual ground The 1 4 wavelength 50 ohm lines that connect each reject load to its amplifier appear as an open circuit to the amplifier This makes the entire reject circuit reject loads R1 through R4 and their eight transmission lines invisible to the two amplifiers Figure 7 3 Gysel Combiner If an amplifier fails i...

Page 168: ... Drop Monitoring Air filters must be changed as necessary to allow sufficient air movement through the cabinet To establish baseline performance make the following measurements a Connect a sensitive manometer such as Dwyer model 40 1 to the small hole in the rear door near the top see Figure 7 4 b Measure the pressure drop across the filters when new c Then block one side of the air input to the c...

Page 169: ...e air switch threshold to 0 25 inches H20 column Turn the adjustment screw in top of cabinet clockwise to increase the pressure differential required to activate the switch or counter clockwise to decrease the differential h Remove vacuum and check to see that J 3 pin 2 falls to 0 volts i Reconnect the air tubing in the cabinet and check for normal operation Press transmitter ON and confirm air sw...

Page 170: ...s the bearing seals that allow lubrication to leak out Any sign of oil leakage indicates that the motor should be replaced or rebuilt with new bearings Inspect fan blades for any sign of fatigue from excessive flexing causing cracking where the aluminum blades are riveted to the hub When removing blades the use of a fan hub puller is recommended 464 0370 000 hub puller for fan blade 7 7 3 Check fo...

Page 171: ...dry climates when cleaning any circuit board with static sensitive components A variety of static safe vacuum equipment is available at most computer supply dealers A soft natural bristled paint brush with metal binding and wood handle can be used to dislodge dust with minimum static generation Hold the metal binding and touch a grounded surface to discharge any difference in potential before work...

Page 172: ...roblem is either in the suspect module or its cabinet The swap test is the easiest way to isolate the problem Swap the VSWR faulting module with a properly working one from another slot If the problem remains in the same slot check the RF output cable connector and 50 ohm combiner reject load for that module slot Inspect the RF cables for poor shield crimp Disconnect each end of the cable and insp...

Page 173: ...sic version of the digital modules where appropriate 8 1 1 Factory Module Repair When a module failure occurs the module may be returned to the factory for repair Pack carefully to avoid damage special shipping boxes are available from Harris USA customers may send a module in for repair by sending via Federal Express to Harris Repair Department 3200 Wismann Lane Quincy IL 62305 International cust...

Page 174: ...ice will be offered wherever feasible but in addition to any shipping charges you will be responsible for all import duties transfer fees or international tariffs 8 1 2 Local Module Repair If local repair is necessary the following troubleshooting guide and repair procedures are recommended We strongly recommend reading the appropriate parts of the Theory of Operation before proceeding The optiona...

Page 175: ...of RF modules Driver modules multistage gain units used to amplify a low level signal to the drive levels needed by the subsequent amplifier stages 525 Watt drivers for analog service These are used as a high power driver 1000 Watt PA modules single stage high power amplifiers which use four parallel quarter module stages to achieve output powers of 1050 W peak 280 W average Different transmitter ...

Page 176: ... the module The modules self protect by automatically disabling themselves if an improper operating condition is detected A protection control and monitor PCM system monitors the modules operating conditions If all of the conditions are acceptable upon an ENABLE signal from the transmitter controller the PCM system will enable the module by switching on the 50 Volts If a fault condition arises or ...

Page 177: ... a microstrip directional coupler which provides a forward drive power sample for overdrive protection a microstrip trombone line section for phase adjustment and a foreshortened Wilkinson 2 way microstrip divider The dividers two outputs drive two parallel Class A amplifiers The outputs are recombined using a foreshortened Wilkinson microstrip combiner which passes the signal through a directiona...

Page 178: ...l through a directional coupler to the module output The directional coupler provides a reflected power sample to the modules protection control and monitor PCM system On the input and output Driver RF Interconnection assemblies are provisions for response correction On the A5A6 assembly are C4 and C12 On the A5A4 RF interconnection assembly is C13 On the two way divider RF Interconnection assembl...

Page 179: ...rs on the 2X2 Way Divider assembly The 2X2 Way Divider assemblies four outputs feeds the four class AB amplifiers The outputs of the four amplifiers feed into the two 2 way Wilkinson combiners on the 2X2 way Combiner assembly The output of the two combiners feeds into the two inputs of the 2 way Wilkinson Combiner assembly The output of this combiner passes through a directional coupler to the RF ...

Page 180: ...e control card PCM and switches on with application of 50 Volts to the quarter modules The quarter module supplies voltages representing temperature and ISO voltage to the module PCM system For any given channel class A and class AB amplifier blocks use the same quarter module circuit The bias voltage adjustment potentiometer controls the quiescent drain current for each FET which determines each ...

Page 181: ...und and C30 and C31 couple the RF to T8 T8 is a two way combining transformer which combines the outputs of the upper and lower amplifier halves and completes the output match R15 provides isolation between T8 s input ports If any phase or amplitude difference exists between the signal in the upper and lower amplifier halves a voltage will develop across R15 This RF voltage will be coupled through...

Page 182: ...is the primary of a toroidal transformer whose secondary is L10 Any RF voltage will be coupled through the toroidal transformer to R12 CR1 C33 an RF peak detector which produces a DC signal proportional to the amount of imbalance This signal is called the ISO voltage sample and it is sent to the PCM system through J1 2 8 2 7 Quarter Module Bias The 15 Volts for the FET bias voltage divider is furn...

Page 183: ...ent switches to turn on or off the 50 Volts DC supplied to the quarter modules They also determine the operating status indications given by the front panel LEDs Upon a module ENABLE signal after the cabinet DC power supply reaches 44 Volts the control logic turns on the pass FETs If a fault is detected the control logic will turn off the pass FETs disabling the module The PCM subsystem performs s...

Page 184: ...gh Enables the 50 Volts DC to the quarter modules by controlling a pair of high power switching FETs pass FETs located on the module rear panel If no faults are present PAL U1 pin 12 sends a signal to U7 pin 8 which controls a circuit that turns on the pass FETs a pair of n channel switching FETs If a fault condition occurs the switching FETs are turned off The switched 50 Volts dc is reduced to 1...

Page 185: ...nical disable In some cases this could be the symptom of a module control fault If you have not disabled the module turn off the transmitter momentarily while removing the module This will prevent possible arcing of the input connector pins if the module was in fact on but not lighting any LEDs 8 2 9 1 Red LED Fault Blink Codes If a module fault occurs the red light will blink on and off The numbe...

Page 186: ... HIGH CURRENTS INVOLVED CAREFULLY INSPECT THE MODULE FOR ANY DEBRIS THAT COULD CAUSE A SHORT TO OCCUR AFTER ANY REPAIR ACTIVITY CAUTION FAILURE TO USE PROPER SOLDERING TECHNIQUES OR MATERIALS CAN CAUSE DAMAGE TO THE REPLACEMENT COMPONENTS OR MAY RESULT IN JOINTS WITH POOR ELECTRICAL OR MECHANICAL INTEGRITY CAUSING SUBSEQUENT DAMAGE TO THE MODULE PLEASE READ THE SECTION ENTITLED SOLDERING PRECAUTIO...

Page 187: ...888 9058 001 WARNING Disconnect and lockout AC primary power prior to servicing 187 8 3 1 Platinum TV Module Test Fixture Part Number 992 8556 002 Optional Equipment Figure 8 5 Wiring Diagram PA Module Extender Harris PN 992 8556 002 Drawing 843 5285 162 ...

Page 188: ...ed through the end cover opposite the fan and connected inside the test fixture by reaching through the cooling slot An interlocked Safety Cover must be in place to activate RF drive to the module under test Breaker CB1 limits the current to 50 amps protecting the cable Breaker CB2 at the test fixture trips from excess module current and can be used as module power switch Interlock switch S2 and d...

Page 189: ...terchangeability with other modules of the same type one easy test to determine whether a problem lies in the system or in the module is the swap test which involves swapping the suspect module with another and observing whether the symptom follows the module 8 3 3 Troubleshooting Based on Module Blink Codes The general procedure for troubleshooting based on a module blink code involves several st...

Page 190: ...an improperly set VSWR fault threshold or a defective module logic board See paragraphs giving procedure used to check and set the VSWR threshold located on section 8 5 2 5 Input Overdrive Fault 2 blinks Normally this protects the module from damage due to excess RF drive at least 3 dB above the drive required to drive the module to full power To isolate the cause of fault reduce the visual excite...

Page 191: ... occur again there may be a problem in the system rather than with the module for example an open cabinet combiner dump load or a damaged module RF power input connector If the ISO fault is confirmed check the bias current of each quarter module one at a time with no drive applied lift the safety cover to remove RF drive A quarter module with bad FET s will have lower bias current than the others ...

Page 192: ...band or 95 to 105 ohms for high band See the procedure located in section 8 5 2 3 to check for the correct ISO Fault Threshold Power Supply Voltage Fault 4 blinks The RF FET transistors operate on a nominal 50 Volt DC supply If the power supply voltage is too high or too low the devices could be damaged The control board monitors the voltage and reports a power supply voltage fault if it is not be...

Page 193: ...s 5 7 9 and 11 If any quarter module input is lower than the reference check for an overheated quarter module an incomplete temperature reporting circuit or failure of a quarter module bias and temperature reporting circuit If the reference voltage is lower than all the temperature reporting lines the outputs of U13 should be high and the output of U5 should be low and the module should not be rep...

Page 194: ...is open look at the 15 Volt regulator U11 itself The regulators tab is internally connected to its output and thus must be isolated from the chassis Use an ohmmeter to check whether the regulator tab has shorted to the chassis Amplifier Module Will Not Enable Has a Steady Red LED Illuminated and Will Not Change to the Green LED Illuminated A possible cause could be that the module control board is...

Page 195: ...uminated the green enable LED but it is not turning on the pass FETs This will not allow the quarter modules to receive the 50 Volts DC that they need in order to operate See the paragraphs on Pass FET Failure Fault 6 blinks located on page A 22 in this section Driver modules The pass FET driving circuitry could also be the culprit as in PA modules In driver modules however a more likely cause is ...

Page 196: ...should still be placed at the module output to prevent oscillation Starting with the first quarter module nearest the logic board and working toward the front handle measure the total idle current of each quarter module in turn Either insert a current meter in line with the 50 Volt wire at TB1 or use a clamp on DC current meter if available With no RF drive applied apply 50 Volts and enable the mo...

Page 197: ...ly 50 Volts and enable the module The current meter connected to the quarter module being adjusted should read almost zero current less than 20 mA Slowly turn each bias pot clockwise to set the current for the corresponding FET then adjust the next bias pot until a total of twice the current per FET is reached and so on until the last FET is adjusted such that the total current is four times the c...

Page 198: ...le to prevent damage to the new components An iron with a temperature adjustment is best Typical settings are 650 F for small chip caps 750 F for RF FET tabs 800 F for coax cables and wiring on large pads e Make the new joint as mechanically sound as possible before making the electrical solder connection Provide mechanical strain relief for leads on components which are flange mounted f Clean all...

Page 199: ...uarter module FACTORY TUNED to the same channel The gain of each quarter module is adjusted by the value of the quarter module input pad The input to output phase relationship is set by TL1 the phase setting coax This coax must remain with the quarter module use the replacement cable already attached to the REPLACEMENT quarter module for proper phasing Replacement quarter modules are furnished wit...

Page 200: ...ANER AS EITHER MAY SEEP UNDERNEATH NEARBY FETS AND DISSOLVE THE THERMAL COMPOUND FROM UNDER THEM CAUSING PREMATURE FAILURE WARNING RF TRANSISTORS ISOLATION RESISTORS AND INPUT ATTENUATORS CONTAIN BERYLLIUM OXIDE BEO CERAMIC A HAZARDOUS MATERIAL THE LIDS ARE MADE FROM AL2O3 AND ARE HARMLESS THE BEO IS HARMLESS WHILE INTACT BUT THE DUST IS TOXIC AVOID CRUSHING OR BREAKING THE BEO CERAMIC AND DISPOSE...

Page 201: ...a Turn off the bias to all four FETs by rotating the bias control pots counter clockwise b Remove the clamp holding down the transistors c Using a 45 Watt soldering iron with a wide blunt tip desolder the leads lifting them with a small knife It is important to use enough heat to quickly flow the solder and work quickly so as not to damage the foil d Remove the old heat sink compound Use a small a...

Page 202: ...yringe if necessary c Put syringe tip in the compound up to the beginning of the barrel of the syringe d Push and pull plunger several times while the tip is in the compound 2 to 4 times to make sure there are no air gaps when filling the syringe e With the tip of the syringe still in the compound begin swirling the tip around in the compound while drawing back the plunger to fill the syringe to 5...

Page 203: ... one end of the FET sweep slowly across the FET Made sure the blade does not lift up There should be a thin opaque film left on the surface after sweeping The gold flashed back of the FET is slightly concave the heat sink compound should be thickest in the center There should be excess heat sink compound on the blade Carefully wipe the excess compound off on a clean cloth do NOT try to re use this...

Page 204: ...r differing expansion between the circuit board and the heat sink Be sure to clean away the old thermal compound from the heat sink surface and apply just enough compound to the flange of the new device in order to assure a good thermal interface After applying reasonable torque to the flange screws solder the leads quickly using a hot iron 8 4 5 Pass FET Replacement If pass FET replacement is nec...

Page 205: ...h access slot in the fixture and connect to wattmeter and 50 ohm load 1kW Install input wattmeter Use RF input access cable on side of test fixture Attach extension section and install module onto fixture Do not install module protective cover at this time Perform a complete visual inspection of the module to be repaired Remove red wire from TB1 and install a current meter in line The current mete...

Page 206: ...5th ratio Pin 5 11 1V 0 2V Over threshold Pin 6 8 9V 0 2V Under threshold To simulate over voltage fault connect an isolated supply at the junction of R47 and R48 Monitor U7 pin 7 voltage to note trip point Inject increasing DC voltage until the circuit trips To simulate under voltage fault connect a 100k ohm variable resistor across R47 Monitor U7 pin 7 and decrease the value of resistance until ...

Page 207: ...n Check Modules are tested for analog service and the Classic drivers and PA drivers have the bias changed Analog PA gain is measured in factory test at visual frequency with carrier only operating at 625 Watts Digital PA Gain is measured 600 watts average power Low band driver gain is measured at 30 Watts average power High band driver gain is measured at 150 Watts average power Turn off module a...

Page 208: ...ibly a 9 Volt battery and a variable resistance inject voltage at P1 2 of any quarter module and slowly increase voltage until the module faults The module should trip off between 1 7 and 2 1 Volts 8 5 2 4 Overdrive Check Perform this check only after verifying that the module gain adjustment is correct See paragraph on Gain Check located elsewhere in this section There are two ways to set overdri...

Page 209: ...t instantaneously while setting the overdrive trip point Check the setting by reducing the power enable the module and increase power The drive power level must trip within the allowed tolerance If not readjust R101 as required FIELD CALIBRATION If the control card has functioning power supplies measure the voltage at U6 pin 6 and adjust R101 for the same voltage on the new board at pin 6 OR Measu...

Page 210: ...requency and apply 94 5 Watts CW into the PA module RF output STEP 4 Slowly adjust R8 CCW until the module disables and gives a blink code of one on the red LED STEP 5 Reduce the signal generator level and enable the module Slowly raise the signal generator level while monitoring the power applied to the module The module should disable between 90 and 100 Watts If not readjust R8 as required STEP ...

Page 211: ...______________________________________________HARRIS 888 9058 001 WARNING Disconnect and lockout AC primary power prior to servicing 211 Table 8 1 Input Attenuator Driver ...

Page 212: ...______________________________________________HARRIS 888 9058 001 WARNING Disconnect and lockout AC primary power prior to servicing 212 Table 8 2 30 Watt Attenuators ...

Page 213: ...eration 9 2 1 Transformer Primary The primary of the main transformer can be connected as a DELTA or WYE load to the AC mains One supply in a cabinet is configured as a Delta the other a WYE This shifts the apparent AC phase 30 degrees resulting in the cabinet appearing to the AC power line as a 12 phase load This reduces the power line harmonic content by 50 The series L2 choke and capacitors are...

Page 214: ...re exceeds 100 degrees centigrade T2 a smaller transformer has two functions Six small rectifiers generate the unregulated V for the power supply and the three phase line voltage sample for the SCR gate control circuit 9 2 3 DC Supply Filtering The rectified output is filtered by a choke input filter The L1 inductor is follow by an external capacitor network consisting of six 240 000 mF capacitors...

Page 215: ...eference REF 1 This reference develops voltage when the 24 volts is turned on and charges C9 This time constant was chosen to ramp up the output voltage at a rate that does not cause a over current condition as the large 1 44 farad capacitor bank charges U5B is a differential amplifier that has the input tied to 12 volts and the inverting input is the output of U5A This feedback control voltage is...

Page 216: ... 00 volts per 100 amps The following opamp compares this voltage with a reference and will turn on CR41 the indicator for an over current fault The fault current set point is 335 amps Over current fault will shut off the 24 Volt regulator and illuminates DS2 c Over temperature Protection When the heat sink temperature reaches 100 degrees centigrade the thermal switch will close firing the SCR remo...

Page 217: ...ked for fault status This card is located at the top of the supply it is not behind a safety cover The D connector on the front is J1 the power supply interface to the transmitter control system The 3 LEDs are to the left of the connector it is normal for them to flash on briefly when the supply is enabled by the logic Removing this D connector will not allow the supply to furnish 50 volts even wi...

Page 218: ...ooler the flow of cooling air from the back door fan may keep the heatsink at a temperature below the fault point The fan may be changed from the front without removing the supply if a short stubby screwdriver is used The cabinet should be turned off and the cabinet input AC breaker locked out to prevent injury If you remove the supply to change the fan check that the rewiring is done correctly an...

Page 219: ...t Control breaker trips at turn on The protection unit on the contactor K1 could have shorted Otherwise investigate for a wire to ground short 9 3 0 5 Slave Controller Power Supply Fault Indication This is not a fault that has a LED indicator on the supply control card The slave controller fault is reporting that the GO NOGO signal is not present A common problem related to this fault is one SCR i...

Page 220: ...adjust the phase balance control to minimize the voltage difference at the lowest point in the waveform the notch voltages should be within 0 2 volts of each other This adjustment minimizes ripple voltage in the supply 9 3 0 7 Vendor Repair Control boards and supplies can be returned for repair Harris will make arrangements with the vendor for repair Harris will need to set up a return authorizati...

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