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Nautel XR3-PREINST, Preinstallation Manual

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XR6/XR3 Pre-installation Manual

Cooling requirements

Issue 3.0  2009-07-15

Page 4-1

Section 4:  

Cooling requirements

This section provides information about heating and cooling requirements for the XR6/XR3 
transmitter site. Topics in this section include: 

•

Air flow in the transmitter

•

Cooling - see page 4-2

•

Heating - see page 4-3

Air flow in the transmitter

The XR6/XR3 uses redundant cooling fans and hot-air convection to ensure effective cooling. Cool 
air is drawn in through a filter in the lower portion of the back of the transmitter. Air circulates into 
the base of the transmitter, and is then pushed up through the front rack of the transmitter by a set of 
fans. Warm air exits the transmitter through the grill or duct at the top of the transmitter. 

Figure 4.1: Air flow in the XR6/XR3 transmitter cabinet with back panel filter installed 

Exhaust air 

Front of 
XR6/XR3 

Back of 
XR6/XR3 

Fans

Incoming 
air

Summary of Contents for XR3-PREINST

Page 1: ...XR6 XR3 Transmitter Pre installation Manual Document XR6 XR3 PREINST Issue 3 0 2009 07 15 Status Preliminary...

Page 2: ...blank...

Page 3: ...Fax 1 207 947 3693 Customer Service 24 hour support 1 877 628 8353 Canada USA only 1 902 823 5100 International Email support nautel com Web www nautel com The comparisons and other information provi...

Page 4: ...blank...

Page 5: ...1 2 Pre installation tasks 2 1 Preparing for installation 2 1 Selecting a location for the transmitter 2 2 Installing an antenna feedline 2 3 Physical requirements 3 1 Clearances 3 1 Dimensions 3 2 We...

Page 6: ...MHz frequency reference 7 2 RF output requirements 8 1 Antenna feed cable 8 1 Antenna system 8 3 Parts and tools 9 1 Contacting Nautel 9 1 Parts supplied by Nautel 9 1 Parts not supplied by Nautel 9 2...

Page 7: ...ge vii Pre installation assistance 11 1 Pre installation consulting 11 1 Installation and commissioning service 11 1 Online documentation 11 3 On site support 11 3 Training 11 3 Standard warranty 11 4...

Page 8: ...XR6 XR3 Pre installation Manual Page viii Issue 3 0 2009 07 15...

Page 9: ...stomers over the Internet and by telephone Nautel s customer support team will answer your questions and work with you to identify and resolve problems For technical support call the Customer Support...

Page 10: ...oting Manual provides detailed technical information about the XR6 XR3 transmitter including electrical schematics and mechanical drawings Nautel website Online resources The Nautel website provides u...

Page 11: ...ation Manual Issue 3 0 2009 07 15 Page xi When using printed documents To find keywords go to the Index section at the end of the manual To find a specific term go to the List of Terms section near th...

Page 12: ...XR6 XR3 Pre installation Manual Page xii Issue 3 0 2009 07 15...

Page 13: ...t the system is live and serious danger is present Mount the transmitter ac power disconnect switch breaker close to the transmitter so that it can be reached quickly in an emergency Clearly label the...

Page 14: ...devices are specifically identified with BeO in the Description column of the Troubleshooting Manual s parts list s Do not cut crush or grind devices because the resulting dust may be hazardous if inh...

Page 15: ...f training courses covering the basic fundamentals of RF systems and transmitters and the operation and maintenance of the transmitter For more information about available courses and schedules go to...

Page 16: ...el does not offer first aid training since the hazards associated with high voltage and RF energy are not specific to the transmitter However the customer should provide first aid training to all per...

Page 17: ...near the feedline antenna and tower At some sites these fields may cause biological effects including the heating of body tissues Intense fields can also create dangerous high voltages on ungrounded c...

Page 18: ...in the transmitter s ac power feed to prevent over voltage from entering the transmitter Lightning protection The transmitter is designed to resist lightning strike damage However intense or repeated...

Page 19: ...o prevent the transmitter from shifting or rocking during an earthquake Even during minor earthquakes rocking or movement of the transmitter is likely to damage the feedline connection and could even...

Page 20: ...XR6 XR3 Pre installation Manual Page xx Issue 3 0 2009 07 15...

Page 21: ...configure exciters on a preset for a specific operating mode e g exciter A for conventional AM and exciter B for IBOC The power output can also be scheduled to correspond with authorized daytime power...

Page 22: ...is optional Ac power The XR6 XR3 variable power transformer can be set to use a range of input voltages and power frequencies as described in Section 2 Installing the power transformer on page 2 1of...

Page 23: ...NxLink module provides an Ethernet interface between the XR6 XR3 and a LAN local area network This interface allows remote control and monitoring of the XR6 XR3 from a computer Safety interlocks Optio...

Page 24: ...XR6 XR3 Pre installation Manual Description Page 1 4 Issue 3 0 2009 07 15...

Page 25: ...that is if the site is already set up for a transmitter go to Step 7 If you are upgrading a site verify the feedline the lightning protection systems and the ac power service Refer to the Nautel Site...

Page 26: ...going to use an external frequency reference ensure that the reference source meets required specifications 14 Prepare to integrate the XR6 XR3 transmitter into your station control circuitry if requi...

Page 27: ...ion reference ground on page 5 4 3 Install lightning protection devices For more information about lightning protection refer to the Nautel Site Protection Manual 4 Pass the center conductor and the s...

Page 28: ...XR6 XR3 Pre installation Manual Pre installation tasks Page 2 4 Issue 3 0 2009 07 15...

Page 29: ...be acceptable if special arrangements are made to install the transformer No clearance is required on either side of the transmitter Check the clearance to ensure that you will be able to open all do...

Page 30: ...XR6 XR3 Pre installation Manual Physical requirements Page 3 2 Issue 3 0 2009 07 15 Dimensions Figure 3 1 XR6 XR3 transmitter dimensions 184 0 cm 72 5 in 59 0 cm 23 1 in 84 0 cm 33 0 in...

Page 31: ...age 3 3 Figure 3 2 XR6 XR3 transmitter cabinet top view 7 1 cm 2 8 in 34 8 cm 13 7 in 6 6 cm 2 6 in 33 0 cm 13 0 in Front AUDIO AC IN RF OUTPUT CONTROL Rear Minimum clearance to rear of transmitter 18...

Page 32: ...al Physical requirements Page 3 4 Issue 3 0 2009 07 15 Figure 3 3 XR6 XR3 transmitter cabinet seen from below looking up 59 0 cm 23 1 in 8 5 cm 3 35 in AC IN Transformer 8 5 cm 3 35 in Rear Anchor Poi...

Page 33: ...r Module Crate contents Uncrated weight Crated weight Main cabinet no RF power modules or power transformer 125 kg 275 lbs N A Main cabinet with 1 RF power module no power transformer 145 kg 319 lbs 2...

Page 34: ...XR6 XR3 Pre installation Manual Physical requirements Page 3 6 Issue 3 0 2009 07 15...

Page 35: ...The XR6 XR3 uses redundant cooling fans and hot air convection to ensure effective cooling Cool air is drawn in through a filter in the lower portion of the back of the transmitter Air circulates int...

Page 36: ...ld not exceed 40 4 C 104 7 F Ensure that hot air from the transmitter is not drawn back into the transmitter s cool air intake Cooling plant requirements Table 4 1 Cooling plant requirements for the X...

Page 37: ...power and then multiply the product by 3 413 Closed loop or forced air cooling systems Closed loop or forced air cooling systems can be used so long as the air is well filtered to prevent dust and ins...

Page 38: ...XR6 XR3 Pre installation Manual Cooling requirements Page 4 4 Issue 3 0 2009 07 15...

Page 39: ...e number of phases and specific voltage range when you order the transmitter Nominal voltage minimum and maximum The primary winding of the main ac power transformer contains taps to accommodate volta...

Page 40: ...o ensure adequate regulation Ac power switch Install an external ac power disconnect between the ac power source and the transmitter Nautel can provide a suitable ac power disconnect if required For s...

Page 41: ...g protection refer to the Nautel Site Protection Manual Recommended configuration for three phase ac power source Use a 4 wire Wye star configuration with the three phases balanced to ground Wiring Ta...

Page 42: ...r is being used connect the transmitter cabinet s designated safety ground point the shield of the coaxial feedline and the ground connection of the power source directly to the surge protector using...

Page 43: ...o the XR6 XR3 Operating and Maintenance Manual In addition you can control the on off status the active A B exciter the preset RF power level the power level adjustment and system alarm reset remotely...

Page 44: ...pproximately 250 V 150 V or 91 V for three phase XR6 transmitters to correspond to the B voltage level currently in use For three phase XR3 transmitters the alarm threshold voltage is factory calibrat...

Page 45: ...n the microcontroller will attempt a changeover to exciter B If it cannot or if the exciter transfer function is set to manual then this fault will cause a shutback Mod driver fault B This fault is re...

Page 46: ...a predefined time limit that must expire before the cutback level returns to the previous level e g level three back to level two If there are no further cutbacks this process continues until Level 0...

Page 47: ...gers this fault if that value is greater than 150 C 302 F While this fault is on RF power will not be available The temperature is assumed to rise 20 C 68 F for each cold start and 10 C 50 F for each...

Page 48: ...while ac power is ON If the ac power faults without adequate backup battery power then the log files will be lost CAUTION Do not wait for an extended period to replace the batteries The control monit...

Page 49: ...a normally open momentary switch The switches must be configured to operate as a single ended input using the transmitter s 24 V dc as the source or as a differential input using an external dc power...

Page 50: ...cal status is set to remote unless otherwise noted That setting can only be made by a local user Inputs are toggled between states by an active pulse unless otherwise noted To ensure proper operation...

Page 51: ...C input otherwise analog input is selected J3 25 IBOC Input Select B input Sets IBOC Analog for Exciter B Continuous active sig nal selects IBOC input otherwise analog input is selected J2 10 Preset S...

Page 52: ...on to continue decreasing the power Remote status and alarm indications Outputs that indicate the status of operator controlled circuits are available on connectors J2 and J3 on the remote interface P...

Page 53: ...ck Indicates that a shutback is currently active J3 3 RF On Status Indicates that the RF On LED is active showing the operator s request for RF power J3 5 6 7 8 9 10 Preset 1 6 Status Indicates which...

Page 54: ...age is a pure square law function and will be 3 9 0 5 V when the forward power is 6 5 kW XR6 or 2 8 0 5 V when the forward power is 3 3 kW XR3 The monitoring circuit s impedance must be greater than 1...

Page 55: ...ce PWB This port allows you to remotely control and interrogate the XR6 XR3 s operational status If the NxLink Ethernet interface module option is installed and you wish to use it as the remote interf...

Page 56: ...XR6 XR3 Pre installation Manual Control and monitoring Page 6 14 Issue 3 0 2009 07 15...

Page 57: ...oth exciters A B The external RF drive must be the carrier frequency c within 5 Hz or 5 parts per million ppm whichever is greater when it is not being modulated have a peak to peak amplitude of betwe...

Page 58: ...ctor J6 2 Configure either or both exciter RF synthesizer s to operate on Ext RF drive by setting the E4 jumper s to 1 2 External 10 MHz frequency reference You can apply an externally generated 10 MH...

Page 59: ...wall or bulkhead Gas insulation flashovers can occur in poor installations Ensure that this part of your installation is installed by professionals experienced with high power radio frequency circuit...

Page 60: ...a conductive path and reduces the effectiveness of the insulator Pitting and erosion of the insulator may also occur To reduce the possibility of tracking damage clean all insulator surfaces periodica...

Page 61: ...DRM systems require better performance from antenna systems To ensure the proper operation during digital broadcasting ensure that the VSWR does not exceed 1 4 1 at the carrier frequency 15 kHz In or...

Page 62: ...XR6 XR3 Pre installation Manual RF output requirements Page 8 4 Issue 3 0 2009 07 15...

Page 63: ...ement program see page 9 2 Tools for installation see page 9 3 Contacting Nautel You can reach Nautel to order parts or for technical assistance at Nautel Limited 10089 Peggy s Cove Road Hackett s Cov...

Page 64: ...tor wiring including the associated terminating devices con duit and conduit clamps All electrical power cables including conduit terminating devices and conduit clamps Parts ordering You can order re...

Page 65: ...ls you need during transmitter installation include the following Digital voltmeter Philips screwdrivers sizes 1 and 2 Pliers Wire cutters Slot screwdriver 5 mm 3 16 inch Metric and Imperial socket se...

Page 66: ...XR6 XR3 Pre installation Manual Parts and tools Page 9 4 Issue 3 0 2009 07 15...

Page 67: ...on Automatic antenna transfer control unit see page 10 2 Automatic switching system see page 10 4 Dynamic carrier control unit see page 10 4 Spares see page 10 4 Documentation see page ix Contacting N...

Page 68: ...ite Place the surge protector as close as possible to the ac service entrance minimizing both the physical and electrical distance between the service entrance and the surge protector For detailed inf...

Page 69: ...than 15 kW RF output power between an antenna and a dummy load Typically an automatic antenna transfer control unit controls the RF contactor s position by applying ac voltage to the set or reset sole...

Page 70: ...when the instantaneous modulation level of the transmitter drops below a threshold The DCC unit supports Amplitude Modulation Companding AMC Dynamic Amplitude Modulation DAM and Dynamic Carrier Contr...

Page 71: ...wer module that has been removed from the transmitter and placed on a workbench The test cable provides low level safe voltages that allow the diagnosis of RF power module problems this is a unique fe...

Page 72: ...llation Manual Accessories Page 10 6 Issue 3 0 2009 07 15 Plug in power modulator unit The power modulator unit is a 2 000 watt plug in unit compatible with all XR series transmitters Figure 10 5 Powe...

Page 73: ...Installation and commissioning service Nautel offers an installation and commissioning service to customers who want assistance with configuring and commissioning a new Nautel transmitter After the cu...

Page 74: ...test equipment has been made available at the site Two channel oscilloscope with probes Audio signal generator Distortion analyzer Spectrum analyzer Modulation monitor Frequency counter 50 test load r...

Page 75: ...roadcast training programs satisfy your day to day knowledge requirements Students participating in Nautel s broadcast transmitter or RF basics training programs earn one SBE credit for each completed...

Page 76: ...n the design parameters and b When the equipment is installed and adjusted according to Nautel s prescribed procedures as stated in the instruction manual 2 Nautel shall provide replacements for all P...

Page 77: ...the information requested for Equipment Being Returned to Nautel on page two of this warranty as is practical The information identified by an asterisk is the minimum required Technical assistance Nau...

Page 78: ...ist price USA customers are required to contact our Bangor Maine facility Canadian and overseas customers should contact our Nova Scotia Canada facility Equipment being returned to Nautel For all equi...

Page 79: ...eds However if you want extended coverage Nautel offers one and two year Extended Warranty Plans to cover electrical and mechanical repairs or replacements for all Nautel equipment Coverage The Extend...

Page 80: ...nsmitter is still covered by its original 13 month warranty period you can contact Nautel by telephone fax mail or email with the model number serial number and date of purchase Once you purchase a Na...

Page 81: ...B The high voltage dc generated by the transmitter s ac power supply for use within the transmitter The B voltage is used to supply the transmitter s modulators and other transmitter circuitry Cutbac...

Page 82: ...presets Shutback A complete loss of RF output power caused by any one of a variety of faults including high VSWR low B voltage high RF current RF drive failure external interlock or spark gap Surge p...

Page 83: ...1 antenna considerations 8 1 antenna feedline 2 3 antenna tower 2 1 antenna transfer control unit NX1 10 2 antenna tuning 8 3 assistance onsite 11 3 assistance technical 11 1 audio processing 5 2 aut...

Page 84: ...ectrodes 8 1 electrostatic protection 2 1 emergency on off switch 5 2 engineering support 11 1 erosion of an insulator 8 2 exciter active 6 1 6 7 external control and monitor wiring 9 2 external DC po...

Page 85: ...2 1 logic true condition 6 10 M mating connector RF 2 2 minimum clearances 3 1 modulation 5 2 8 2 modulation monitor 6 13 modulation 8 3 module testing cable XR PMTK 10 5 moisture damage to insulator...

Page 86: ...7 6 13 RF contactor 10 4 RF divider on insulators 8 2 RF feedline 2 2 2 3 RF output coaxial cable 9 2 RF output voltage waveform 6 12 RF power preset 6 1 6 7 room transmitter 4 2 S safety interlocks 2...

Page 87: ...1 transmitter room 4 2 triple junctions RF feedline 8 2 tuning antenna 8 3 typical program content 6 8 6 9 U uncrated weight 3 5 upgrading a site 2 1 upper rear panel 3 1 V varistor 5 3 voltage feed...

Page 88: ...XR6 XR3 Pre installation Manual Page IX 6 Issue 3 0 2009 07 15...

Page 89: ......

Page 90: ...823 3900 or Toll Free 1 877 6NAUTEL 6628835 Canada USA only Fax 1 902 823 3183 Nautel Inc 201 Target Industrial Circle Bangor Maine USA 04401 Phone 1 207 947 8200 Fax 1 207 947 3693 Customer Service...

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