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Nautel XR6, Operation And Maintenance Manual

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XR6/XR3 Operations and Maintenance Manual

Routine maintenance

Issue 3.1   2013-03-14

Page 4-5

Procedure

Perform the following steps to test the lightning protection systems: 

1. Test the continuity between ground available at your lightning arrestor and ground available 

on various pieces of equipment connected to the transmitter. Ensure that there is no 
resistance (0 ohms). 

2. Physically inspect the lightning arrestor to ensure that all connections are tight. Also look for 

any sign of scoring or burning (indications of possible damage from earlier lightning strikes). 

3. Using binoculars, visually inspect the hardware on the tower. Look for charred, broken or 

frayed connections and corrosion.

Summary of Contents for XR6

Page 1: ...XR6 XR3 Transmitter Operations and Maintenance Manual Document NHB XR3 XR6 OPS Issue 3 1 2013 03 14 Status Standard...

Page 2: ......

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: ......

Page 5: ...ds 1 xii Safety Precautions xiii Personal Safety 1 xiii Site Safety 1 xiv Equipment Safety 1 xvi Description 1 1 Ac dc power stage 1 1 Exciter stage 1 2 RF power stage 1 4 RF output filter 1 5 Control...

Page 6: ...ng the event log 3 1 Viewing the event log 3 1 Clearing the event log 3 6 Event log messages 3 7 Routine maintenance 4 1 Scheduled maintenance 4 1 Replacing air filter 4 2 Performing on air checks 4 3...

Page 7: ...cted during a troubleshooting task see Section 5 Test and adjustment on page 5 1 Performing procedures When using procedures in this manual perform each step in sequence If you are asked to see anothe...

Page 8: ...nty information see Pre installation assistance on page 11 1 of the XR6 XR3 Pre Installation Manual For extended warranty information see Pre installation assistance on page 11 1 of the XR6 XR3 Pre In...

Page 9: ...el User Group NUG The website includes a special section that customers can log into in order to access the Nautel customer newsletter product manuals frequently asked questions FAQ information sheets...

Page 10: ...XR6 XR3 Operations and Maintenance Manual Page x Issue 3 1 2013 03 14...

Page 11: ...xcess of 72 volts capable of causing a fatal electrical shock are present on or near parts bearing this label Mount the transmitter ac power disconnect switch breaker close to the transmitter so that...

Page 12: ...These 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...

Page 13: ...umber of 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...

Page 14: ...d Nautel 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 al...

Page 15: ...ularly 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 ungro...

Page 16: ...ng any exposed components Provide a grounding wand or known ground e g a grounded metal table that personnel can use to discharge themselves Surge Protection Surge protection is recommended for your e...

Page 17: ...r Do not place the transmitter under water pipes drains or sprinklers Keep any equipment that generates heat like the transmitter away from flammable materials like ceiling panels cubicle dividers and...

Page 18: ...XR6 XR3 OPERATIONS AND MAINTENANCE MANUAL PAGE XVIII VERSION 3 1 2013 03 14...

Page 19: ...cated at the end of the XR6 XR3 Troubleshooting Manual Redundancy The XR6 XR3 features redundancy in all key systems RF power modules optional fully redundant backup is available Exciters Cooling fans...

Page 20: ...In single phase XR3 transmitters there are also four levels 220 V 196 V 115 V and 69 V Ac power transformer The XR6 XR3 s power transformer can be set to use a range of input voltages See Section 3 In...

Page 21: ...A and Fc B The Fc A and Fc B signals are provided to the RF drive buffer PWB via the exciter interface PWB The RF synthesizer PWBs also provide signals at twice the pulse duration switching frequency...

Page 22: ...the interphase PDM driver PWB RF drive buffer PWB The RF drive buffer PWB A15 buffers the carrier frequency signal Fc generated by the active RF synthesizer PWB A or B to provide the RF drive voltage...

Page 23: ...lter NOTE The XR6 XR3 has one optionally two RF power modules Each RF power module has two parallel inductors in the combiner RF Power Module 1 RF 1 A Spark Gap Shutback A4 Forward Reflected Power Pro...

Page 24: ...monitoring and RF power stage status information is applied to the control monitor stage Based on the value and status of each input the control monitor stage produces the appropriate control signals...

Page 25: ...ERFACE EXCITER STAGE PWB REMOTE PWB BUFFER INTERFACE ETHERNET PWB DISTRIBUTION B P S AC DC RF POWER RF POWER STAGE PDM DRIVER PDM DRIVER INTERPHASE RF PWB A PWB EXCITER INTERFACE RF DRIVE MODULE OPTIO...

Page 26: ...9 Changing general settings see page 2 10 Controlling presets see page 2 10 Changing power preset schedules see page 2 12 Changing meter groups see page 2 14 Viewing digital meters see page 2 14 Setti...

Page 27: ...GUI provides soft menus that change depending on the information screen being displayed and the transmitter s status CHECKSUM error screen 1 In the unlikely event that the CHECKSUM error screen appear...

Page 28: ...t to change the hardware settings press the Continue button to proceed Otherwise press the Back button to return to the Main Menu page GUI pages Table 2 1 defines the available GUI pages Table 2 1 GUI...

Page 29: ...2 21 Calibrate Meters Calibrate the digital meters available in the GUI page 2 24 Set Thresholds Change the thresholds that protect the transmitter page 2 22 Calibrate Analog Meter Calibrate the analo...

Page 30: ...de In the Select mode press the desired Soft Keys to move the cursor the selected area of the screen and scroll through lists or menus You can use the Up and Down buttons to scroll through information...

Page 31: ...ower modules on page 2 8 Select Automation control to change the settings for auto exciter switchover and the power scheduler see Changing automation settings on page 2 9 Select Software version to vi...

Page 32: ...tive cutbacks and reduce the estimated soft start relay temperature to 150 C 302 F if it is over that temperature Press the Back button to return to the Meters page Note The software keeps track of th...

Page 33: ...red Config option The possible combinations are Module A enabled with module B on standby Module B enabled with module A on standby The Current Status line displays the currently enabled module s If n...

Page 34: ...de value and pressing the Edit button You can then use the Up or Down buttons to change the setting to Manual or Auto Auto Scheduler mode In Auto Scheduler mode the scheduler controls which preset is...

Page 35: ...ling presets see page 2 10 Changing meter groups see page 2 14 Adjusting screen contrast see page 2 20 Changing hardware settings see page 2 20 Press the Back button to return to the Main Menu see Mai...

Page 36: ...power monitor gain or main power module Then press the Edit button to alter the selected setting Your changes take effect immediately For example if you change the RF power monitor gain the RF power...

Page 37: ...ied by an animated arrow and the text Different indicating that there is a difference between the active power level and the preset s stored power level Press the Set Power button to store the current...

Page 38: ...moves to the preset s time Use the Up and Down buttons to increase or decrease the start time for the preset The time is in 24 hour format For example 06 00 is 6 a m and 18 00 is 6 p m Press the Clear...

Page 39: ...the Edit button to highlight the current selection and press the Up and Down buttons to scroll through the available meters Press the Save button to save your changes Press the Cancel button to rever...

Page 40: ...UI Figure 2 10 Meters page Press the Up or Down buttons to scroll to different meters Press the Menu button to go to the Main Menu If an alarm is active a Status button appears Press the Status button...

Page 41: ...the cursor over the fields from left to right to highlight a value To change the highlighted value press the Edit button then press the Up or Down button to increase or decrease the value Press the S...

Page 42: ...a 30 day period for the previously set value of Current RTC Calibration Delta 30 day Correction Displays the difference between the Previous 30 day Correction and the Effective 30 day Correction to f...

Page 43: ...If the XR6 XR3 s clock lost time on the standard the Delta 30 day Correction value should be positive 4 Press the Save button to store the calibration value 5 Reset the XR6 XR3 s clock according to th...

Page 44: ...ge shows the release number and the date of the release The right side of the page shows information about the individual components in the current release Press the Refresh button to update the value...

Page 45: ...the setting Changing hardware settings You can set thresholds calibrate digital and analog meters and restore factory settings using the Hardware Settings menu To view the Hardware Settings menu selec...

Page 46: ...s see page 2 27 Setting high power lockout limit see page 2 27 Configuring NxLink optional see page 2 31 Press the Back button to return to the General Settings menu If you select Factory Settings a w...

Page 47: ...dc offset used to zero the transmitter s RF cur rent probe Carrier Ramp Up Interval Sets the interval in tenths of seconds for the transmitter to ramp up to its maximum carrier reference value after...

Page 48: ...To change a threshold select the threshold and press the Edit button Press the Up and Down buttons to change the threshold value For future reference record the threshold value before and after makin...

Page 49: ...after the change for future reference Calibrating analog meter You can recalibrate the XR6 XR3 s analog forward power meter if necessary using the Calibrate Analog Meter page Note The transmitter is c...

Page 50: ...Up and Down buttons to select Half Scale Meter Reading Press the Edit button then press the Up and Down buttons to adjust the digital value until it reads exactly the same as the pointer Press the Sa...

Page 51: ...ess the Save button to save your calibration Pressing the Cancel button discards your changes CAUTION Do not calibrate B thresholds unless specifically instructed by Nautel personnel Decreasing the Re...

Page 52: ...Ref Limit values The PDM A and B values represent the current duty cycle of the PDM drive signal B switching typically occurs at a duty cycle of approximately 40 To recalibrate the B switching points...

Page 53: ...ue to the same value as the Current Carrier Reference Press the Save button to save your setting Pressing the Cancel button discards your changes 4 Use the Up and Down buttons to select High Power Loc...

Page 54: ...s asking you to confirm that you wish to proceed Figure 2 24 Factory Settings warning page Note The Factory Settings menu is available only when operating in Local mode 10 18 0 00kW M 1 B 1 PM A Man E...

Page 55: ...Operating the transmitter Page 2 30 Issue 3 1 2013 03 14 Press the Cancel button to cancel the request leaving your transmitter settings intact or press the Confirm button to restore the factory sett...

Page 56: ...Down buttons to select IP Address Netmask Gateway or DNS Server DHCP d Address is not a selectable field The address is automatically assigned when the NxLink is connected to a LAN if DHCP is availabl...

Page 57: ...XR6 XR3 Operations and Maintenance Manual Operating the transmitter Page 2 32 Issue 3 1 2013 03 14...

Page 58: ...Log page The Events Log page shows a list of recent faults and other events The second line of the page shows the total number of events in the log the number of alarms and the index number of the eve...

Page 59: ...ars in the bottom right corner of the page showing the page number and the total number of available event pages Press the Next Event button to view the next event in the list This keeps you on the sa...

Page 60: ...x A Man 001 24Oct06 10 48 43 LVPS Fault RF Power Off Fwd Power 0 00kW Control Local Shutback Yes Exciter A Man B 1 PM A Man Preset M 1 Use Up Dn Keys to view event data 1 5 Next Event Back 10 18 0 00k...

Page 61: ...0 0V PA Volt P S 0 0V 15 Volt P S 0 0V RF Drive P S 0 0V 15 Volt P S 0 0V Fan P S 0 0V 5 Volt P S 0 00V Use Up Dn Keys to view event data 3 5 Next Event Back 10 18 0 00kW M 1 B 1 PM A Man Ex A Man 00...

Page 62: ...t Page 5 10 18 0 00kW M 1 B 1 PM A Man Ex A Man 001 24Oct06 10 48 43 LVPS Fault LVPS Fault Cutback Level 0 Use Up Dn Keys to view event data 5 5 Next Event Back 10 18 0 00kW M 1 B 1 PM A Man Ex A Man...

Page 63: ...nts of the Events Log press the Clear Log button A warning screen will appear Figure 3 7 Clear Log Warning page Press the Continue button to clear the log or press the Back button to return to the Mai...

Page 64: ...the Preset Scheduler have been enabled Command Manual Power Automatic Preset changes using the Preset Scheduler have been disabled Command Exciter A Changeover to Exciter A Command Exciter B Changeov...

Page 65: ...XR6 XR3 Operations and Maintenance Manual Using the event log Page 3 8 Issue 3 1 2013 03 14...

Page 66: ...isits is three months Local operating and environmental conditions may dictate more frequent visits while in remote sites less frequent visits may be acceptable Experience and system reliability will...

Page 67: ...B contains a battery backup circuit that provides a memory of alarm occurrences during ac power failure See Replacing the control display PWB battery on page 4 3 Replacing air filter In order to maint...

Page 68: ...on scheme used on the transmitter A spectrum analyzer if one is available Procedure 1 Monitor the transmitter signal to identify any problems Use a high quality receiver to monitor audio quality Check...

Page 69: ...e control display PWB See Figure MD 3 in the mechanical drawings section at the end of the XR6 XR3 Troubleshooting Manual 4 Close the front panel 5 Check for any alarms on the graphic user interface S...

Page 70: ...tor and ground available on various pieces of equipment connected to the transmitter Ensure that there is no resistance 0 ohms 2 Physically inspect the lightning arrestor to ensure that all connection...

Page 71: ...XR6 XR3 Operations and Maintenance Manual Routine maintenance Page 4 6 Issue 3 1 2013 03 14...

Page 72: ...mpact a specific adjustment can have on other steps These adjustments should be performed during initial turn on and after major repairs or a frequency change Test equipment required To perform the pr...

Page 73: ...tion checks Verify that the RF output is appropriately modulated when audio is applied 1 Connect an appropriate modulation monitor to the remote interface PWB RF MONITOR connector J8 The modulation mo...

Page 74: ...on is required it is recommended the AUDIO GAIN potentiometer on the interphase PDM driver PWBs be left at the factory setting 8 If the program audio cannot be set to 10 dBm when 100 modulation is req...

Page 75: ...t exciter A as the active exciter 2 Connect an oscilloscope to BNC connector J5 RF DRIVE TEST on the RF drive buffer PWB 3 The oscilloscope should indicate a symmetrical 50 duty cycle square wave with...

Page 76: ...ow frequency long duration high amplitude peaks Verify the modulation peaks are limited as follows 1 Connect an oscilloscope between TP7 and ground on the remote interface PWB 2 Connect an audio signa...

Page 77: ...XR6 XR3 Operations and Maintenance Manual Test and adjustment Page 5 6 Issue 3 1 2013 03 14 Figure 5 1 Chopper Control Waveform Audio 30Hz AC Coupled...

Page 78: ...enna 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 Cu...

Page 79: ...o six 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 Su...

Page 80: ...dware settings 2 20 Changing meter groups 2 14 Checking hardware 4 2 Checks on air 4 3 Checksum error 2 2 Cleaning 4 1 Clearing the event log 3 6 Clock setting 2 16 Control monitor stage block diagram...

Page 81: ...air filters 4 2 Restoring factory settings 2 27 RF drive buffer PWB functional description 1 4 RF drive symmetry 5 4 RF output filter functional description 1 5 RF power blocks functional description...

Page 82: ......

Page 83: ...e 1 877 6NAUTEL 662 8835 Canada USA only or Phone 1 902 823 3900 or 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 S...

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