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Platinum Z5 CD Скачать руководство пользователя страница 108

4-42

888-2408-002

WARNING: Disconnect primary power prior to servicing.

Overall System Theory

4.7.4

PA Controller Boards

There are two (2) PA Controller Boards in the Z5 transmitter. They utilize micro-
controllers which report to the Master Controller, but operate independently of the
Master. Each controls half or 8 of the 16 PAs. Table 4-1 on page 4-60 shows which
PAs are controlled by each of the PA Controller Boards. The two boards are
identical except for the programmable ID number which is set with DIP switches on
the board to determine which board is PA Controller 1 and which is PA Controller 2.
The following is a listing of the PAs under the control of each PA Controller:

PA Controller #1 (PAC1)

•

A1, A2, A5, A6, B3, B4, B7, B8

PA Controller #2 (PAC2)

•

A3, A4, A7, A8, B1, B2, B5, B6

The PA Controllers are responsible for the following:

•

Turn on/Turn off of the PAs via the PA gate bias voltage.

•

Metering, status and fault monitoring of the PAs and the isolation resistors associ-

ated with them.

•

Control of the combiner isolation switches (located on the isolation boards)

which are associated with the PAs under its control.

•

Crossover protection (the ability to mute the PAs which are controlled by the

other PA Controller Board in case of a failure).

4.7.4.1 PA Turn On/Turn Off

The PA Controllers primary responsibility is to turn the PAs on and off. The PAs are
turned on and off by varying the bias voltage on the gates of the MOSFETs on the
PAs. If the gate voltage is -0.6V, the PA is turned on full. If the gate voltage is -18V,
then the PA is turned off. This means the PA Controllers have the ability to turn off
or MUTE each PA individually, or all at the same time if it is necessary to MUTE
the entire transmitter RF output.

Whenever a defective PA is to be shut off or MUTED, all of the PAs will be
MUTED for 120mS while the defective PA is disconnected from the combiner by
the isolation switch. The rest of the PAs are then turned back on.

4.7.4.1.1 Control Distribution and Controller Failure

Each PA Controller controls half (8) of the PAs, see Table 4-1 on page 4-60. Note
that each PA Controller Board controls two PAs on each foursome. This pattern of
control distribution allows for maximizing of power output if one of the PA
Controller Boards fails.

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Содержание Z5 CD

Страница 1: ...Platinum Z5 CD FM Transmitter Manual Platinum Z5CD FM Transmitter Manual 888 2408 002 June 9 2003 Rev C T M No 888 2408 002 Copyright Harris Corporation 2000 2001 All rights reserved...

Страница 2: ...ain 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...

Страница 3: ...sconnect primary power prior to servicing MANUAL REVISION HISTORY Platinum Z5 CD 888 2408 002 Rev Date ECN Pages Affected B 12 17 01 47926 Title page added MRH1 MRH2 sections 2 and 4 C 06 09 03 TBD Ti...

Страница 4: ...888 2408 002 WARNING Disconnect primary power prior to servicing...

Страница 5: ...02 etc that corresponds to the number found in the schematics C001 in a bill of material is equivalent to C1 on the schematic or 2 gives added information or further explanation i e Used for 208V oper...

Страница 6: ...888 2408 002 WARNING Disconnect primary power prior to servicing...

Страница 7: ...and fire protec tion standards must be observed The following National Fire Protection Association NFPA standards are recommended as reference Automatic Fire Detectors No 72E Installation Maintenance...

Страница 8: ...888 2408 002 WARNING Disconnect primary power prior to servicing...

Страница 9: ...ation to a hospital as quickly as possible E If arms or legs are affected keep them elevated NOTE If medical help will not be available within an hour and the victim is conscious and not vomiting give...

Страница 10: ...888 2408 002 WARNING Disconnect primary power prior to servicing...

Страница 11: ...14 External and Failsafe Interlock Connections 2 15 External Interlock Connection 2 15 Failsafe Interlock Connection 2 15 Initial Turn on 2 16 Remote Control Connections 2 21 Control Inputs 2 22 Stat...

Страница 12: ...System Description 4 30 Master Controller 4 31 EEPROM U39 4 31 APC Automatic Power Control 4 32 Calibration Factors and A D Values 4 34 DAC_APC_REF 4 35 Forward Factor and A D_FWD_PWR 4 36 APC Factor...

Страница 13: ...ower Output 6 13 Asterisk and Pound Signs 6 13 Master Controller Related Faults 6 14 THERMISTOR Fault 6 14 EEPROM_DEF EEPROM U39 Default Load 6 15 REF_WARNING 5V Reference Warning 6 15 MSTR_REF 5V Ref...

Страница 14: ...s 6 28 PS _START Soft Start Circuit Fault 6 29 PS _HS_TEMP Rectifier Heatsink Temperature 6 29 PS _DSCHG Discharge circuit fault 6 29 PS _PHS_LS Phase Loss 100 120 Hz ripple 6 30 PSC 20V Fault 6 30 PS...

Страница 15: ...for use up through the initial turn on of the equip ment Section 3 Operators Guide describes operation of the equipment and is intended to be the primary section referenced by operating personnel Sec...

Страница 16: ...nd commands for switching between main alternate DIGIT exciters and IPAs Redundant RF amplifier modules that allow maintenance while the transmitter remains on the air at reduced power Hot Pluggable m...

Страница 17: ...with all Platinum Z transmitters The DIGIT with its digital input module generates the complete stereo FM waveform in the digital domain using a digital signal processor DSP as a stereo generator and...

Страница 18: ...ue isolation means that each module will continue to work into a nominal 50 ohm load regardless of the number of active amplifiers for almost zero stress to the amplifiers during fault conditions The...

Страница 19: ...supply powering half of the PA amplifiers Most other sections such as the IPA and the control system are powered from both supplies The supplies are regulated by reliable tap switching techniques non...

Страница 20: ...1 6 888 2408 002 WARNING Disconnect primary power prior to servicing Introduction Specifications...

Страница 21: ...plete or if the unit is damaged electrically or mechanically notify the carrier and HARRIS CORPORATION Broadcast Systems 2 3 Returns and Exchanges Damaged or undamaged equipment should not be returned...

Страница 22: ...an be tol erated A closed air system is recommended in these environments that is an air conditioned room that recirculates and properly filters the room air No outside air is brought into the transmi...

Страница 23: ...hipped with the power supply installed the power supply tray is covering the bolts so the fan assembly on the rear of the transmitter will also have to be removed to access the rear pallet bolts the p...

Страница 24: ...bles in a metal conduit which is separate from the AC supply Remote control cabling may be included in the same conduit with the exciter cabling AC power wiring and small signal lines should never be...

Страница 25: ...Connections on page 2 11 If there are any discrepancies then the transformer tapping will have to be checked and possibly changed as outlined below WARNING DISCONNECT AND LOCKOUT STATION PRIMARY POWER...

Страница 26: ...W11 and W12 blue and one control voltage cable W21 gray with orange connector hanging on the right side of the power supply compartment 1 First connect W12 to J4 on the PS2 Rectifier Board See Figure...

Страница 27: ...y compartment and two smaller gray wires 40 and 41 plug into the gray Wego block connector A17TB1 on the front of the power supply tray A17 designates a component on the power supply tray See Figure 2...

Страница 28: ...ottom front corners of the power supply compartment Re install the front cover panel for the power supply compartment 2 5 5 Single Phase Power Supply Installation Before installing the power supply ch...

Страница 29: ...fier Board on PS2 nearest the back of the transmitter and should be connected first Be sure to route this cable so it does not touch the resistor standing up on top of the Rectifier heatsink See Figur...

Страница 30: ...block and the wire can be inserted Be very careful not to let the wire ends fray as the connectors are very close together and could cause a short The wire insulation should actually extend just insid...

Страница 31: ...ses If you prefer to use a circuit breaker in your installation select one with a motor starting trip curve similar to the RK5 curve for fuses This type of delayed response is needed in order to accom...

Страница 32: ...op terminals on contactor K1 Access is also available through the bottom of the transmitter For 380VAC 342 432VAC 3 Phase 4 wire systems there is also a large insulated standoff located near the main...

Страница 33: ...s practical to minimize the lightning voltage potential carried by the coax into your building For coaxes a single point of entry into the building is best with all connected to a common grounding pla...

Страница 34: ...he blower motor operate from any voltage within the specified range of the tapping chart without re tapping 2 5 6 5 Exciter AC Voltage Selection Once the site voltage has been checked verify that the...

Страница 35: ...N command after the external interlock connection is restored CAUTION TO CONNECT TO THE WAGO BLOCK J4 ON THE LIFE SUPPORT BOARD REQUIRES PRESSING A SCREWDRIVER INTO THE RECTANGULAR SLOT ON THE FRONT S...

Страница 36: ...ted on the front panel of the Controller STEP 1 Activate the STATION AC POWER source to the transmitter STEP 2 Turn on the low voltage power supply breaker CB1 located in the rear of the transmitter c...

Страница 37: ...The modules should only require a minimal amount of force for insertion into the card edge connectors If they do not slide in easily check the connectors on the combiner boards and visually inspect t...

Страница 38: ...WARNING Disconnect primary power prior to servicing Installation Initial Turn On Figure 2 6 PA Compartment Front View Figure 2 7 PA Compartment Rear View A1 A2 A3 A4 IPA_AB1 IPA_AB2 B1 B2 B3 B4 B5 B6...

Страница 39: ...dules installed the Fault LED on the controller front panel should be flashing at this point This indicates that there are inactive faults in the fault log which need to be cleared at this time To res...

Страница 40: ...is optional as it simply makes the transmitter FWD PWR meter read 100 at the customer specified Transmitter Power Output TPO which should already be factory set This will not change the kW reading on...

Страница 41: ...Terminations provided in the Platinum Z5 Transmitter allow remote control of the transmitter functions by connection to terminals on terminal board A1TB1 TB1 is a 38 pin Terminal strip with a D conne...

Страница 42: ...rated by relay contact or transistor switching See Figure 2 10 Figure 2 10 Ground Switching for Remote Control Lines 2 5 11 2 Status Ouputs The status output lines on TB1 are transistor type open coll...

Страница 43: ...ould not exceed 28Vdc NOTE Maximum status line current is 25 mA If the output is used to drive a small printed circuit board type relay check current requirements for relay coil and be sure to install...

Страница 44: ...t using the Diagnostics Display Menu press HOME MORE CONFIGURATION A D This should bring up the screen shown in Figure 2 14 The default setting is shown as UPS This means the input is ready to be used...

Страница 45: ...set for 2 5kW via software in the Diagnostics Display System However if the transmitter is operating in LOW power when the UPS mode is activated then the transmitter will stay at the LOW power level...

Страница 46: ...See Figure 2 16 Automatic Mode When AUTO mode is selected the transmitter will automati cally optimize the efficiency every 12 hours if there are no active faults present This is the recommended mode...

Страница 47: ...or a complete listing of all configurable parameters see System Configuration and Calibration in Section VI Troubleshooting Figure 2 18 Low Power Alarm Set Screen 2 9 Jumper Settings for Installation...

Страница 48: ...2 28 888 2408 002 WARNING Disconnect primary power prior to servicing Installation Initial Turn On Table 2 1 TB1 Remote Control Interface Connections...

Страница 49: ...888 2408 002 2 29 WARNING Disconnect primary power prior to servicing Installation Initial Turn On Table 2 1 TB1 Remote Control Interface Connections continued...

Страница 50: ...2 30 888 2408 002 WARNING Disconnect primary power prior to servicing Installation Initial Turn On Table 2 2 Jumper Setting for installation of a Harris Exciter...

Страница 51: ...r transmitter Transformers and motors can be designed with extra safety features where thermal rise is limited to acceptable levels however in this case other transmitter parameters cannot be made acc...

Страница 52: ...ory operation of the overall transmitter may result For this reason along with their inherent susceptibility to transients Harris does not recommend the use of open delta systems Figure 2 19 Closed De...

Страница 53: ...gs will It has been reported by engineers that installation of a third transformer and transient protection devices have eliminated the difficulty 2 10 5 Three Phase Wye Distribution Transformers The...

Страница 54: ...ilable with this configuration In summary both symmetrical power distribution systems are satisfactory because of their balanced impedances Use either a closed delta or a four wire WYE system for maxi...

Страница 55: ...rmal operational procedures and information pertaining to the function of the Platinum Z5 Transmitter Most important is the information regarding use of the Diagnostic System All of the information in...

Страница 56: ...the foldback is gone ON LOW Turns the transmitter on to the previous LOW setting If the transmitter has folded back power automatically due for instance to high VSWR pressing the LOW button will retur...

Страница 57: ...of measure for the forward power reading is percentage with 100 representing the nominal power output for the station This percentage can be calibrated to any power level using the Configuration contr...

Страница 58: ...ing labeled Diagnostics Display Menu Tree is included in the schematic package This drawing shows all of the menus and screens available in the Diagnostic display system Note that the drawings are div...

Страница 59: ...is the first of two screens in this layer The second screen in the HOME layer is accessed by pressing the D function key to the right of the display which is labelled MORE on the display The screen sh...

Страница 60: ...nly two screens Figure 3 5 Status Layer 2 Page 1 3 4 3 MORE MORE is a menu item which is used when there are more menu items on a layer than will fit on one screen It will take you to the next screen...

Страница 61: ...e 3 6 PA Temperature Metering HOME METERING C A C Example 2 You want to check or possibly change the Maximum High Power Setting This falls under the category of CONFIGURATION but this menu item only s...

Страница 62: ...t in the Main Menu Pressing Fault will take you to the screen shown in Figure 3 8 This screen gives you a choice of resetting the transmitter faults and fault log and clearing any red indicators or vi...

Страница 63: ...A should be taken out turned over and re inserted placing the bad PA in a different foursome For example if PA amplifiers B1 and B2 have failed pull out the A2 B2 PA module turn it over and plug it ba...

Страница 64: ...ss HOME STATUS D C This will bring up the screen shown in Figure 3 10 Pressing D will toggle between the two exciters Figure 3 10 Exciter Status Screen HOME STATUS D C 3 7 Manual IPA Switching The act...

Страница 65: ...Figure 3 12 Automatic Mode When AUTO mode is selected the transmitter will automati cally optimize the efficiency every 12 hours if there are not faults present This is the recommended mode of operat...

Страница 66: ...ease transmitter efficiency However if any fault occurs the fan will automatically switch to high speed until the fault is no longer active The fan can also be forced to HIGH speed using the configura...

Страница 67: ...shown on this diagram is the control and monitoring associated with the advanced Controller and Diagnostics system 4 2 1 Exciters It starts with the built in dual exciter option in other words the sw...

Страница 68: ...4 2 888 2408 002 WARNING Disconnect primary power prior to servicing Overall System Theory Figure 4 1 RF System Block Diagram...

Страница 69: ...s provides the necessary 8 drive signal for the 8 PAs connected to Z Plane A The PAs are labeled A1 A8 for Z Plane A and B1 B8 for Z Plane B PAs 1 4 on each Z Plane are located in the front of the tra...

Страница 70: ...g paragraphs 4 3 1 Exciter Operation The exciter output is basically fixed and should not require adjustment The exciter power output is set using the controls on the front of the exciter and should b...

Страница 71: ...IPA Power Output The power output of the IPA determines the power output of the transmitter and is varied by changing the gate bias on the IPA amplifiers MOSFETs The gate bias for the IPA is adjusted...

Страница 72: ...t relay K2 If EXCITER SELECT goes high K1 will be energized and switches to the Exciter 2 RF output This switching will take place automatically if an exciter fault is detected by the Master Controlle...

Страница 73: ...he screen in Figure 4 3 Pressing the D function key will now toggle K2 and K3 switching from IPA_AB1 to IPA_AB2 or vise versa 4 3 3 3 IPA Monitoring The IPA Backplane Board provides for monitoring and...

Страница 74: ...s gives the controller time to shut off the IPAs via the IPA gate voltage IPA1_GATE so that the connector contacts do not arc 4 3 3 6 IPA Power Divider 3dB Hybrid The IPA power divider is actually a 3...

Страница 75: ...t on an output the Wilkinson circuit and the load resistors act to keep the input impedance of the splitter near the nominal value of 50 ohms Each output from each 8 Way Divider is fed to the input of...

Страница 76: ...r 4 3 4 4 Power Amplifier PA See Figure 4 4 The RF drive from the IPA enters the PA Amplifier Boards at Pin C The RF input level for each amplifier is typically 15 20 watts TL1 C1 and C2 allow the inp...

Страница 77: ...x without the need for a blocking capacitor Maximum RF output is 425 watts Typical output level is 300 to 340 watts The power module is designed for single amplifier field replacement In the event an...

Страница 78: ...002 WARNING Disconnect primary power prior to servicing Overall System Theory Figure 4 5 PA Compartment Front View Figure 4 6 PA Compartment Rear View A1 A2 A3 A4 IPA_AB1 IPA_AB2 B1 B2 B3 B4 B5 B6 B7...

Страница 79: ...in the ratings of the modules The effects are minimized by the 2 way combiner and its isolation resistor which will tend to absorb imbalances and by the characteristics of the 3dB hybrid combiner whic...

Страница 80: ...forward output power and one coupler arranged to provide a sample of the reflected output power The isolation or directivity of the couplers is better than 30dB with 40dB typical NOTE Note that the re...

Страница 81: ...lly The 3 Phase 3 wire and 4 wire supplies have all of the same components but have a different wiring harness The PA power supplies whether 3 Phase or Single Phase are regulated by reliable tap switc...

Страница 82: ...he 16 PAs Four of these are on Z Plane A and four on Z Plane B Therefore PS 2 provides power for the remaining 8 PAs There is only one PS Controller for both supplies however each supply still operate...

Страница 83: ...charge Circuit 4 4 1 1 1 PA Power Supply Discharge The PA Power Supply Discharge circuit also uses the Soft Start resistor to discharge the 52Vdc PA supply The discharge circuit is activated when the...

Страница 84: ...secondary windings has 4 output taps each of which are connected through an SCR to ground The SCRs act as both tap switches activating the tap which gives the appropriate DC voltage output and as rec...

Страница 85: ...ter the 6 second soft start the resistor is bypassed by activating the normal run mode SCRs which are also attached to the lowest voltage output tap but connect directly to ground This allows the supp...

Страница 86: ...AC contactor 4 5 Detailed Power Supply Descriptions 4 5 1 3 Phase PA Power Supply Refer to the Overall System Block Diagram in the schematic package for the following discussion The transmitter 3 pha...

Страница 87: ...888 2408 002 4 21 WARNING Disconnect primary power prior to servicing Overall System Theory Figure 4 11 3 Phase Power Supply Simplified Diagram of Transformer and Rectifier Connections...

Страница 88: ...ere originally made as one board which is broken apart for assembly Therefore there is an A side and a B side both of which are shown on the same schematic The left side of the schematic is the B side...

Страница 89: ...forward biases diodes CR4 CR8 and CR12 on the B side and CR13 CR17 and CR21 on the A side This turns on the associated SCRs Q4 Q8 and Q12 for the B side and Q13 Q17 and Q21 on the A side Each of the...

Страница 90: ...ly and Soft Start from being activated while the DISCHARGE signal is active b Second it allows the base of Q37 to pull high shutting it off R62 will then pull the gates of Q29 and Q31 low turning them...

Страница 91: ...lation approximately 2Vdc change per tap to compensate for AC line variations 4 5 2 1 Rectifier Board The SCRs for the single phase are required to carry a much larger amount of current than the 3 Pha...

Страница 92: ...tivates SCRs for 48V tap J4 3 DRIVER 2 activates SCRs for 50V tap J4 5 DRIVER 3 activates SCRs for 52V tap J4 7 DRIVER 4 activates SCRs for 54V tap NOTE The circuit for the 48V tap will be explained h...

Страница 93: ...al is active low and comes from the PS Controller Board When low it causes the output of U2 14 to go high This does two things a First it reverse biases CR31 which allows the gate of Q33 to pull high...

Страница 94: ...proper reporting to the Master Controller The PS Controller will not allow 2 IDs to be the same The jumper configurations are given below These jumpers are located on the Rectifier Boards on both the...

Страница 95: ...e active low FAN_SPEED_SELECT signal from the Life Support Board A19K3 activates the fan speed select relay K2 mounted next to the AC mains contactor on the cabinet wall K2 is shown on the Overall Sys...

Страница 96: ...e firmware The Controller consists of the following boards Master Controller Board PA Controller 1 PA Controller 2 Power Supply Controller 1 Power Supply Controller 2 Optional Life Support Board Displ...

Страница 97: ...EEPROM U39 The Master Controller has 3 memories ROM firmware RAM volatile and an EEPROM non volatile U39 When the low voltage is applied to the controller it loads up the program from ROM to RAM and...

Страница 98: ...l be reduced which will in turn reduce the PA RF output If the forward power output goes down the IPA RF output will be increased which will increase the PA RF output to compensate The APC loop starts...

Страница 99: ...al if there are no System Mutes present Due to the low impedance of the circuit the Manual PWR REF pot R25 has little or no effect on the circuit CR4 and R30 shift the positive APC voltage to a propor...

Страница 100: ...fe Support Power Level CAUTION IN LIFE SUPPORT MODE THERE IS LIMITED OVERLOAD PROTECTION AND NO FOLDBACK FUNCTIONS ADJUSTING R25 TO MORE THAN 25 RATED POWER WILL CAUSE THE TRANSMITTER TO SHUT OFF AND...

Страница 101: ...press C The edit controls should now show up on the screen CAUTION ENTERING A WRONG VALUE IN ONE OF THESE SCREENS COULD CAUSE SERIOUS DAMAGE TO THE TRANSMITTER OR EXTERNAL SYSTEMS IT IS RECOMMENDED T...

Страница 102: ...PWR CAL screen to 5kW and calibrating we are telling the micro that 806 represents 5kW The micro now calculates the Forward Factor by dividing the 5kW by the square of 806 or Forward Factor FWD PWR CA...

Страница 103: ...C_Factor The Operating APC Factor is frequency compensated based on the slope of the coupler output and is the factor calculated above If the transmitter is operating at the same frequency at which it...

Страница 104: ..._MAX UPS SET kW APC_Factor DAC_MAX HOME MORE CONFIGURATION C B is the display variable which will contain one of the above numbers depending on which mode the transmitter is in Once these are set the...

Страница 105: ...ed on the Master Controller and then A D converted in the micro for metering This A D value shows up as A D_RFL_PWR HOME MORE CONFIGURATION C B which at 2 1V should be very close to 700 the A D conver...

Страница 106: ...e input to the open loop gain differential amplifer U7 13 is the calibrated voltage from the reflected coupler from Life Support Board As long as there is little or no reflected power the voltage at U...

Страница 107: ...ond timer is started b Strike 2 If another fault is detected before the 10 seconds is up the transmit ter will again mute for 3 or 6 seconds start the 10 second timer again and slowly ramp the power u...

Страница 108: ...hes located on the isolation boards which are associated with the PAs under its control Crossover protection the ability to mute the PAs which are controlled by the other PA Controller Board in case o...

Страница 109: ...s a temperature sensor on each PA which sends a tem perature sample voltage to one of the PA Controllers The temperature of each individual PA can be checked by pressing METERING C A then C or D to ch...

Страница 110: ...e loss of one power supply will create the same scenario as loss of one PA Controller the loss of 2 PA per foursome 4 7 4 4 PA Controller Faults For a complete listing of the faults associated with th...

Страница 111: ...ded the contactor has been activated and the Master Controller is operating normally This will first activate the SOFT_START outputs at J1 8 and J2 8 This allows the supplies to charge slowly limiting...

Страница 112: ...plies are fully active again or shut off by the PS_DISABLE signal 4 7 5 4 Discharge Protection Circuit The discharge protection circuit protects the power supply and the discharge circuit components f...

Страница 113: ...ng However they are also digitally filtered by the micro by two filters The first is a 50 to 60 HZ band pass filter whose output is used to detect a loss of a rectifier fuse on the transformer seconda...

Страница 114: ...connects via AND gates all signals from the Master Controller and allows the transmitter to stay on the air at 1 4 power with minimal fault protection and no visible monitoring for the operator Transm...

Страница 115: ...e must be a closed connection between J4 10 and J4 7 GND on the Life Support Board or between TB1 7 and TB1 6 on the Remote Control Interface terminal strip This will activate the optical isolator U24...

Страница 116: ...g the trans mitter to turn on In summary the signal at U33 12 CONTACTOR_ON BAR will not allow a second turn on pulse to be deliv ered while the transmitter is still running and in Life Support Mode b...

Страница 117: ...there is a jumper from TB1 8 to TB1 10 ground b It can also be connected directly to the Life Support Board to J4 7 and J4 8 Be very careful when connecting to these terminals The pressure necessary t...

Страница 118: ...to relay K1 13 as the exciter mute and to inverter U13 7 as an IPA mute a Exciter Mute K1 directs the mute signals SOFTSTART MUTE and SYSTEM_MUTE to the on air exciter K1 is shown in the RESET or Exc...

Страница 119: ...F output Exciter switching is done by latching relay K1 EXCITER1_SELECT is a pulsed signal which will go high to select exciter 1 This will make U12 8 high if the Master Controller is working MSTR_NOR...

Страница 120: ...e IPA output level The IPA output level is controlled by the signal MSTR_IPA_CTL which is an analog voltage variable DC which will control the IPA gate voltage Varying the gate voltage will vary the I...

Страница 121: ...If the coupler is connected the line is pulled low and no fault occurs When disconnected the line will pull high and the Master Controller will mute the transmitter 4 7 6 1 10Reflected Power The refle...

Страница 122: ...PA control signal to the active IPA When the Master Controller fails MASTER_NORMAL will go low opening the U5 13 switch The MANUAL PWR REF pot R25 now controls the transmitter power output This is fac...

Страница 123: ...e exciters K1 applies AC to the contactor coil while K2 applies AC to the exciters 2 The high at U26 13 enables the XMTR_ON_LOW pushbutton on the front panel overlay when in Life Support Mode to enabl...

Страница 124: ...Life Support Mode It is cleared by the MASTER_NORMAL BAR signal when the Master Controller is opera tional The Master Controller normally takes care of this function via the SYSTEM_MUTE line d MASTER_...

Страница 125: ...the MASTER_NORMAL line This line will be high only if the Master Controller has failed which is the case here for Life Support Mode Therefore the LS_SYST_FAULT will cause U6 3 to go high Next OR gates...

Страница 126: ...PAC 1 This cross numbering is due to the fact that Z Plane B is inverted compared to Z Plane A The seventh column is actually the intermediate step between the PAs and the PA Controllers and gives the...

Страница 127: ...lethal voltages are shielded behind doors or clear lexan shields which require a tool to be opened Shut off all power before servicing the transmitter other than replacement of modules The Front and r...

Страница 128: ...information to be recorded and analyzed to provide a database for a failure reporting system is as follows DISCREPANCY Describe the nature of the malfunction Include all observable symptoms and perfor...

Страница 129: ...mperature Monitoring press METERING C A then select the desired Z Plane Keeping a regular log of the PA temperatures versus Ambient temperature will give a quick indication of a possible problem or th...

Страница 130: ...hut off the transmitter and disconnect primary power at the wall breaker Remove a PA module to allow access to the Z Plane connectors Connect the common lead of the meter to the chassis and check pins...

Страница 131: ...Log the abort screen will read VSWR high During the test the HIGH ON and LOW ON buttons will not work The test can be started at any time and any power level above 50 If a fault is detected during th...

Страница 132: ...he Z5 one for each Z Plane The boards are mounted on each side of the 5kW power block 5 5 1 1 Isolation Board Removal a There are 2 ribbon cables connecting to each Isolation assembly The cables shoul...

Страница 133: ...with the thermistor already attached as this is very critical to proper transmitter operation 5 5 1 3 Installation of Isolation Assembly If a new Isolation Board is being installed be sure to set the...

Страница 134: ...le which attaches to it NOTE The directional couplers are held in place on the harmonic filter with 2 hose clamps Be sure to place the clamps as far toward the edge of the coupler body as possible and...

Страница 135: ...g the Raise and Lower buttons STEP 2 To enter a new MAX HIGH setting go to the MAX HIGH SET screen HOME MORE CONFIGURATION B B change to the new maximum power level and press BACK to save the changes...

Страница 136: ...TPO as well MAX HIGH sets the maximum power level when the HIGH ON button is pressed while MAX LOW sets the maximum power level when the LOW ON button is pressed 5 10 Setting Life Support Power Level...

Страница 137: ...ard Power Calibration procedure requires an external power meter to be used as the calibration reference STEP 1 Shut the transmitter off Press HOME MORE CONFIGURATION D and set your operating frequenc...

Страница 138: ...MORE CONFIGURATION C A D C STEP 6 Set R127 on the Life Support Board maximum CW STEP 7 Turn the transmitter on Make sure the exciter power is on and un muted STEP 8 Press HOME MORE CONFIGURATION C B T...

Страница 139: ...left of the display to calibrate the FWD power and save the new information The display will flash Calibration Done very quickly at the bottom of the Diagnostics Display The external meter and the FWD...

Страница 140: ...the VSWR Foldback screen Set the VSWR FOLDBACK to 1 49 Press BACK to save the settings STEP 4 Press HOME MORE CONFIGURATION C A B Set the value of REFLECT FACTOR to 0 000306 see Figure 5 7 To access t...

Страница 141: ...djust R128 until the A D RFL PWR reading is 700 Go slowly the adjustment is sensitive Figure 5 8 A D RFL PWR Screen HOME MORE CONFIGURATION C B STEP 9 Set the Transmitter LCD meter the right hand disp...

Страница 142: ...PC BOARDS OR IC S TO PREVENT DAMAGE TO THE COMPONENTS 5 13 1 Replacement of the Life Support Board If the Life Support Board is replaced the following procedure should be performed STEP 1 Turn off the...

Страница 143: ...eration in Life Support Mode Adjust R24 on the Life Support Board for 2 1Vdc at U3 5 This sets the fault threshold to 150 Watts of reflected power when Life Support Mode is active STEP 10 Set R127 Max...

Страница 144: ...pins 1 2 d JP2 pins 1 2 5 13 3 Replacing a PA Controller Board Replacement of a PA Controller Board requires no analog adjustments Set all dip switches and jumpers to the same position as the board be...

Страница 145: ...ower from the transmitter STEP 2 Remove the defective Master Controller Board STEP 3 Carefully remove U39 from the new Master Controller Board and replace with the EEPROM from the defective Master STE...

Страница 146: ...only the EEPROM U39 is being replaced then exchange U39 with the new one re install the Master Controller Board and skip to STEP 6 If the Master Controller Board is also being replaced then proceed w...

Страница 147: ...should appear on the screen STEP 8 Press the HIGH ON button and then quickly press and hold the LOWER button for 10 seconds This will turn the transmitter on at zero power output STEP 9 Proceed to 5 1...

Страница 148: ...ut with AC power applied from the wall breaker The REMOTE DISABLED LED should be lit on the front panel of the transmitter For the following setup refer to the Diagnostics Display Menu Tree for more d...

Страница 149: ...n kW which is to be displayed as 100 on the FWD PWR meter Default is 05 00KW b MAX HIGH SET This screen will let you set the upper limit the transmitter will be allowed to go to in the High Mode of op...

Страница 150: ...Firmware ICs Each of the controller boards with the exception of the Life Support Board have 2 Firmware IC s which contain the software for the microcontrollers It is possible that these may need to...

Страница 151: ...rers do make a special extraction tool for these type of IC s but it has been found that a sharp meter lead or ice pick actually works better for extracting them Place the sharp tool point into one of...

Страница 152: ...5 26 888 2408 002 WARNING Disconnect primary power prior to servicing Maintenance and Alignment Table 5 2 Z5 Minimum Recommended Transmitter Log Readings...

Страница 153: ...omponent level troubleshooting is not an option But due to the complexity of the circuitry and the use of surface mount components especially in the controller boards which are multi layer boards as w...

Страница 154: ...TS NATURE AND OF THE NECESSARY SAFETY PRECAUTIONS AFTER USE DISPOSE OF AS CHEMICAL OR SPECIAL WASTE ACCORDING TO THE REGULATIONS APPLY ING AT THE LOCATION OF THE USER IT MUST NEVER BE THROWN OUT WITH...

Страница 155: ...re are still 2 failed PAs B1 and A2 but now each one is in a different foursome This will restore balance to the system and the transmitter will still be able to operate at near full power output by a...

Страница 156: ...r will issue the TX_RESTART command and try to return the transmitter to normal operation after any fault has occurred Note that this will not reset or erase any of the faults stored in the Fault Log...

Страница 157: ...p again Strike 3 A third fault detected within this 10 seconds will cause the transmitter to be muted until the operator gives the transmitter an ON command High or Low locally or by remote If the cau...

Страница 158: ...the display and ABCD to the right To avoid confusion every line from one screen to the next is labelled A B C or D where it leaves a screen to correspond with the keypress required on the actual disp...

Страница 159: ...t Reset Note the warning asking if you really want to erase the faults in the log just in case this screen was reached by accident Pressing YES D will erase any of the faults in the Fault Log which ar...

Страница 160: ...Table 6 5 provide a quick reference containing a complete listing of all of the faults which can show up on the Diagnostics Display Menu including their effect on transmitter operation and a brief com...

Страница 161: ...educe the transmitter power to 40 of nameplate TPO 2kW and will be going through a MUTE cycle for each of the 16 PAs The antenna VSWR must be 1 2 1 or less with no faults present in order to run the t...

Страница 162: ...e Z Planes or Isolation Boards The following sequence of tests make up the SYSTEM TEST PA Muting Test PA ISO Resistor and Thermistor Test PA RF Switch Test 6 7 1 1 PA Muting Test Each PA will be muted...

Страница 163: ...e PA may be failed since the switch is grounding the its output A normal PA current would rule this out c The ISO resistor is open which means it would not draw any current and would not get hot These...

Страница 164: ...r if the Master Controller needs to be replaced If it fails the test U39 will have to be replaced and a complete System Configuration and Calibration will have to be done per the procedure in Section...

Страница 165: ...eens can be extremely helpful in determining where to start looking for the source of the fault This screen will only show a YES status if the front panel FOLDBACK LED is illuminated 6 8 2 Turning the...

Страница 166: ...ircuit becomes open the detector input goes high which gives a cold temperature reading This leaves the device to which the thermistor is connected unprotected from an over temperature condition Once...

Страница 167: ...considered to be invalid or out of tolerance and was replaced with a Default value from the firmware prom This fault is an indication that the EEPROM U39 should be replaced Refer to Section V Mainten...

Страница 168: ...wer level while staying below the foldback threshold The Foldback light on the front of the controller will be illuminated The VSWR Fault threshold is set via software in the Diagnostics Display Menu...

Страница 169: ...n the AC power returns no operator intervention required 6 9 9 LOW_AIR Fault Nominal air flow for the Z5 is 350 cfm The aiflow reading should be near 100 at high fan speed and is typically around 60 f...

Страница 170: ...e current is not less than 1 amp then the system does not have the ability to shut off the IPA and will mute the system by shutting off the PAs and the exciter 6 9 13 IPA_AB _LOW Power Fault If one of...

Страница 171: ...o the fault condition All power supply meter readings will be replaced with an asterisk 6 9 20 PAC _COMM Fault This is a communications fault between one of the PA Controllers and the Master Controlle...

Страница 172: ...temperature goes below 115 C the foldback will be reversed and the power will be very slowly increased until the power output is back to normal or until the load temperature again rises to 115 C at wh...

Страница 173: ...n the fault log and on the front panel fault light Action will not be taken until an exciter low power condition is detected The controller will delay 10 seconds to give the exciter time to recover th...

Страница 174: ...eference of these faults is given in Table 6 4 on page 6 37 6 11 1 General PA Troubleshooting As a general rule the first step in troubleshooting any PA or IPA problem is to swap the PA or the entire...

Страница 175: ...at is less than 10 of the average current of the other three the system will be muted for 120mS the isolation switch for that PA activated removing the PA from the combiner and the mute released on th...

Страница 176: ...de of the PA Normally the ISO resistors have minimal current flow through them and run about 40 100 C If the amplifier connected to the ISO resistor has a difference in phasing or amplitude compared t...

Страница 177: ...led down then it is probably a failure of the RF Switch To locate the correct RF Switch and or ISO Load get the A or B _ISO there should also be one of these in the Fault Log fault number and use Tabl...

Страница 178: ...will protect the system if the Master Controller is not operational or if the foldback routine fails to reduce the load temperature The foldback description is in the Master Controller Faults under Sy...

Страница 179: ...ontroller at J1 J2 J11 and J12 J1 and J2 connect to the Isolation Boards while J11 and J12 connect to the Z Planes The PA Controller boards have ID jumpers to select the board as PA Controller 1 or PA...

Страница 180: ...only other easy troubleshooting would be to swap out the controller card if a spare is available This also requires setting the ID switches on the new PS Controller board to the same as the one being...

Страница 181: ...rt Discharge resistor or failed SCRs and or SCR fuses 6 12 2 2 PS _HS_TEMP Rectifier Heatsink Temperature There is a thermistor temperature sensor mounted on each of the rectifier heat sinks on top of...

Страница 182: ...ault is not used in the single phase transmitter It is also important to note that there could be several other faults show up as a result of a phase loss PAC _VOLTS IPA_LOW EXC _AFC These faults are...

Страница 183: ...oking at the DC input voltage data from the PA Power Supply 52Vdc It is interpreted as an indication of a transformer secondary fault which could be a fuse or SCR If one of the taps has been detected...

Страница 184: ...Fuses TAP 1 48V Q13 F13 Q4 F4 CR4 F4 Q17 F17 Q8 F8 CR8 F8 Q21 F21 Q12 F12 TAP 2 50V Q14 F14 Q3 F3 CR3 F3 Q18 F18 Q7 F7 CR7 F7 Q22 F22 Q11 F11 TAP 3 52V Q15 F15 Q2 F2 CR2 F2 Q19 F19 Q6 F6 CR6 F6 Q23 F...

Страница 185: ...888 2408 002 6 33 WARNING Disconnect primary power prior to servicing Troubleshooting Figure 6 7 3 Phase Power Supply Component Locator Top View...

Страница 186: ...6 34 888 2408 002 WARNING Disconnect primary power prior to servicing Troubleshooting Figure 6 8 Single Phase Power Supply Rectifier Assembly Component Locator Top View...

Страница 187: ...AC power supply failed 20V power supply on Life Support Board is less than 12V Mute XMTR save fault time Transmitter will automatically return to operation when power returns LOW_AIR Low air flow fau...

Страница 188: ...lt PAC1_COMM Communication lost between Master and the PA controller Request another controller to mute ISO_AB Reject Load ISO_AB on the 3dB hybrid is 145o C Will follow 3 Strike Routine described in...

Страница 189: ...nd release the mute on the rest of the amplifiers A _OUT B _OUT The designated PA is not properly seated in the connector Make sure the module is properly inserted and the thumbscrews on the PA module...

Страница 190: ...OAB Designated ISO load Temp 145o C Means ISO_APC foldback has failed to reduce temperature of the load Fold back level is 135 o C NOTE This is the load on the 5kW 3dB hybrid which is combining the Z...

Страница 191: ..._TAP1 Tap 1 failed One or more of the secondary SCRs for the 48V tap have failed on the designated Power Supply Tap1 fault indication PSC will automatically switch to Tap2 if it is not faulted If Tap2...

Страница 192: ...6 40 888 2408 002 WARNING Disconnect primary power prior to servicing Troubleshooting...

Страница 193: ...888 2408 002 7 1 WARNING Disconnect primary power prior to servicing Parts List 7 1 Part List Index...

Страница 194: ...7 2 888 2408 002 WARNING Disconnect primary power prior to servicing Parts List...

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