Nautel V10 User's Installation And Operation Manual

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Nautel V10 User's Installation And Operation Manual Manual pdf 127 page image

V10/V7.5/V5/V3.5 Installation and Operation Manual Page 5-23Section 5 System Level Troubleshooting Issue 3.5(b) Ensure the switching power supplymodule’s ON/STANDBY switch is ON(toggle up). Press Reset in the Statusmenu to verify the power supply doesnot restore to normal operation.(c) If the green AC OK lamp is on, verifythat a fault exists with that switchingpower supply module by installing themodule in another module position. Itmay be necessary to remove anoperational module.CAUTIONBefore removing any switching powersupply modules, ensure their ON/STANDBYswitch is set to STANDBY (toggle down).(d) Remove the suspect switching powersupply module and an operationalswitching power supply module. Installthe suspect module in the position ofthe operational module. Set theON/STANDBY switch to ON). Pressthe Reset button in the Status menu.(e) If the suspect module still displays aPS Fail alarm, then the problem is withthe module. Service and repairinstructions for this module are beyondthe scope of the manual. Remove andreplace the module.(f) If the suspect module no longerdisplays a PS Fail alarm, then thefault is not with the module, but withthe cabinet position (cabling defect).Confirm by installing the operationalmodule removed in step (d) in thesuspect module’s original position.Press the Reset button in the Statusmenu. If a PS FAIL alarm occurs, thefault is with the cabling associatedwith that cabinet position.Possible Associated Alarms:- PS Fail A - PS Fail D as applicable- PS Fail E - PS Fail H (V10/V7.5) asapplicable- IPA PS Fail A or B5.5.6.2 Backup Battery Low AlarmA Backup Battery Low alarm occurs ifthe battery voltage falls below anacceptable level or if there is a fault on thecontrol/display PWB (A43). Troubleshoota Backup Battery Low alarm as follows:(a) Measure the dc voltage across thebattery (BT1) - while installed - on thecontrol/display PWB (A43):• if the voltage is less than 2.7 V,replace battery BT1 while the acpower is still on.• if the voltage is 2.7 V or greater, verifythe alarm by either cycling the acpower (off, then on) or checking thealarm again in 24 hours. If the alarmclears, it was a false alarm. If thealarm does not clear, replace thebattery or suspect a fault with thedetection circuitry on the control/display PWB.Possible Associated Alarms:- Backup Battery Low5.5.7 Changeover AlarmA Changeover alarm indicates an exciter,IPA, IPA PS (V5/V3.5) or fan PSchangeover to the reserve module hasoccurred for the following reasons:NOTEAlarms displayed on the Status screen arereal-time (current/non-latching). Use theEvents Log to determine the root cause ofa changeover alarm.• Exciter fault (dual exciter transmittersonly): An exciter changeover can occurif the active exciter [A (A14) or B (A15)]fails due to an exciter related fault,such as IPA Input Low alarm. See theapplicable paragraph under Exciter(see 5.5.1) alarm to troubleshoot.