Nautel V10 User's Installation And Operation Manual

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Nautel V10 User's Installation And Operation Manual Manual pdf 125 page image

V10/V7.5/V5/V3.5 Installation and Operation Manual Page 5-21Section 5 System Level Troubleshooting Issue 3.55.5.4.2 Fan PS Fail and ReplacementA Fan PS Fail alarm occurs if the fansupply is below the Low Fan Voltagethreshold (default is 47 V, user definable).The fault is likely in the active fan supply[A (U13) or B (U14), if applicable], butmay be in the fan distribution PWB (A12),the control/display PWB’s (A43) detectioncircuitry or a wiring defect. Troubleshoot aFan PS Fail alarm as follows:NOTEFor dual fan PS transmitters, if the standbyfan PS is operating, there are no faults withthe fan distribution PWB, the control/display PWB or wiring.(a) Determine the fan PS module (A or B)that caused the alarm. The status barat the top of the GUI will show whichfan PS is currently active and thesystem diagram’s Changeover alarmLED will be on, indicating achangeover occurred. The active fanPS module’s green LED will also beon.(b) Verify ac is applied to the suspect fanPS and it is within the supply’sacceptable range (85 – 264 V ac).(c) Replace the defective fan PS module:• Press RF Off and switch ac off at theservice entrance.• Remove wiring from terminals on thefan PS (A or B, as applicable).• Remove the fan PS module(s) byremoving its four M4 Phillips screws.(d) Install operational fan PS module(s)and replace/reconnect wiring. Switchon the ac and press RF On.(e) Adjust the replacement fan PSmodule’s potentiometer one turncounter-clockwise.(f) Inhibit Fan PS changeover by settingAuto to N in the changeover menu.Select the replacement module as theactive Fan PS. The transmitter shouldbe inhibited.(g) Adjust the replacement fan PSmodule’s potentiometer clockwise untilthe dc voltage at TP1 (FAN V) of thefan distribution PWB is 52.0 V.(h) The transmitter should resumeoperation. If applicable, restoreautomatic changeover by setting Autoto Y in the changeover menu.Possible Associated Faults:- Fan PS Fail5.5.5 Ac Mains AlarmAn AC Mains alarm occurs if the ac mainsvoltage is below an acceptable level forthe switching power supply modules tocontinue operating properly. The likelycause of this fault is external to thetransmitter and is related to ‘brown-out’conditions, power loss or poor mainsregulation. Troubleshoot as follows:WARNINGThe transmitter is inhibited during anAC Mains alarm, but potentially lethalvoltages may still be present on someassemblies. Take necessaryprecautions when troubleshooting.NOTEAn Ac Mains alarm will only be activebriefly, just before the LVPS ac mainsdrops below its acceptable limit and thecontroller circuit loses power. When thetransmitter resumes operation, the AcMains alarm will turn off, but the EventsLog will indicate a Low Ac Alarmoccurred.