UPSB125 Uninterruptible Power Supply UPS Battery

Troubleshooting

Usage:

The UPS provides the following tools to aid in troubleshooting the unit:

General alarms and messages that are related to specific events of the UPS are shown on the display.
Detailed status and fault messages that are associated with operation of the UPS can be accessed by using the UPS Tuner interface.

Before the UPS is taken out of service, gather information from the following sources:

Status logs
Fault logs
Personalization
Measurements logs
Board Status logs

General Operation

Table 1 lists the possible causes or corrective actions for problems that are associated with the general operation of the UPS.

Show/hide table

Table 1
Problem	Possible Causes or Corrective Actions
Input switch "Q1" trips	Faulty CSNEN/CSNON module including the SCR Faulty phase rotation Faulty component or device Faulty Q1 switch
Rectifier does not start (PFC fault)	Input source out of tolerance Open input power fuse Faulty CSNEN/CSNON module including the SCR Faulty DCHEN/DCHON Faulty MIZN PCA DC capacitor is shorted
DC regulation is unstable	Faulty input SCR Faulty CSNEN/CSNON module Faulty DCHEN/DCHON Loose ribbon cable or control harness Faulty TA1, TA2, TA3 Faulty MIZN PCA
High AC ripple on the DC bus	Open or faulty batteries Open or faulty DC capacitors Faulty DCHEN/DCHON DC regulation is unstable. See the problem above.
Inverter does not start	Faulty MUTEN/MUTON module Open inverter output fuse Faulty MIZN PCA Faulty CSIEN/CSION module including the SCR Faulty LEM TA4, TA5, TA6 Faulty output AC capacitor C4, C5, C6
Inverter starts, inverter voltage = 0, no current limitation	Faulty CSIEN or CSION PCA Faulty MIZN PCA
Inverter starts, inverter voltage = 0, inverter goes into current limitation	Faulty CSIEN or CSION PCA including SCR Faulty MIZN PCA Faulty LEM: TA4, TA5, or TA6 Faulty output AC capacitor: C4, C5, or C6
"KA1" or "KA2" contactor does not close	KA1 or KA2 contactor coil is open or shorted Faulty Local or Remote EPO signal Faulty KCTN PCA Faulty ALIN PCA
"QF1" battery circuit breaker is not closed, display shows charger fault	Check wiring at SMB07 at DALIN and TB5. The QF1 auxiliary connection must be normally open. Faulty DCHEN or DCHON Faulty CHAN PCA
"QF1" battery circuit breaker tripped	Faulty DCHEN or DCHON Faulty CHAN PCA Load test batteries, check for open cell or shorted cell, and replace with new batteries. Check the batteries for ground faults.
"QF1" battery circuit breaker will not close	Check 24 VDC on DALIN at XMB07 to TB5 pin 1 and pin 3. Replace DALIN. If problem persists, replace ALIN PCA. Check that the UV coil is not open. Check that the "Breaker Magnetic trip" setting is set on "Maximum".
Battery temperature fault	Check the ambient temperature of the UPS room. Verify that the cooling fans are operational. Check connection XMD3 on the CHAN PCA. Check wiring from the ATIZ to the CHAN PCA. Faulty AITZ
No display, UPS is inoperable	Faulty ALIN PCA Faulty AGAN display assembly Faulty GDEN PCA
No display, UPS is operational	Faulty AGAN Display assembly Check that the contrast is set correctly. Check for a loose ribbon cable or a loose control harness. Faulty GDEN PCA
Display metered values inaccurate	Incorrect voltage or power applied to unit Faulty personalization Faulty wire harness on CSNEN, CSNON, CSIEN, or SCION Loose ribbon cable or control harness Faulty MIZN PCA Faulty TA1, TA2, or TA3 Faulty CT1, CT2, or CT3
Button on Display inoperative	Faulty AGAN display assembly
LED on Display Panel inoperative	Verify LED operation. Using LED lamps, test for a bad LED. Faulty AGAN display assembly
CAN communication relay fault	Faulty GDEN Faulty CAT5/RJ45 cable
CAN communication resynchronization fault	Faulty GDEN Faulty CAT5/RJ45 cable
External CAN communication fault	Faulty GDEN Faulty CAT5/RJ45 cable
Internal CAN communication fault	Faulty GDEN Faulty CAT5/RJ45 cable