MARK5 IDOS project is already at least 15 years old

QD 1480-1483
TCEA POWER SUPPLY OUT OF LIMITS XXX (XXX BEING P5, P15, N15, AND P24, RESPECTIVELY)
THIS ALARM IS RESPONSIBLE FOR CHECKING THE TCEA CARD POWER SUPPLY LIMIT.
and
QD 272-277
IOMA POWER SUPPLY OUT OF LIMITS, XXXX (XXXX BEING P5, P15, N15, P24, N24, AND DCOM, RESPECTIVELY) THIS ALARM IS RESPONSIBLE FOR CHECKING THE IOMA CARD POWER SUPPLY LIMIT.

I would like to remove those alarms,I got at least three different ones on three different mark5.

I checked most of the voltages all are very close to nominal values such as 15.3 for the 15 VDC and 24.3 for the 24 VDC as example, But obviously out of the detected range of the cards as I got this diagnostic alarms, sometimes they disappear then back again after few minutes but no apparent reason such as a motor or big load starting, unfortunately I cannot see any power supply adjustment on P/S cards!
Inlet Mark5 DC voltage is a steady 125VDC, no problem or no flustation <i>[moderator's note: I think he means fluctuation]</i> on this

Any way to get rid of those???

 

GE has PROM upgrades that would likely resolve many of these Diagnostic Alarms. But, at a cost, of course. Some of them were published in TILs (Technical Information Letters); some were not.

I also personally believe that sometimes as power supplies get older the voltage regulators begin to drift and fail. I also believe that dust, dirt and humidity can also lead to nuisance Diagnostic Alarms such as these. If there is any induced AC on the DC wiring (caused mostly by poor construction practices which failed to properly isolate AC and DC wiring in conduits and cable trays) can cause these kinds of Diagnostic Alarms.

Lastly, I have seen failed/failing battery charger output filter capacitors cause nuisance Diagnostic Alarms such as these. Sometimes, the battery charger output looks just fine (such as during steady state operation), but when there is a load on the battery (such as if the Emer. L.O. Pump is cycled during starting) the output can be quite ugly when viewed with an oscilloscope for the time when the charger is producing a lot of DC current.

If you're confident these alarms are nuisance alarms, then you should use the ALARM LOCK feature to lock them to prevent them from toggling and wasting alarm printer paper, filling up the Alarm Queue, and generally keeping operators from enjoying their well-deserved sleep. LOCKing an alarm (I believe both Process- and Diagnostic Alarms can be locked from their respective displays) will prevent it from printing, from filling up the queue, and from generally annoying operators who can annoy I&C technicians with their whining about nuisance alarms.