Operating instructions

Operating Instructions 29
.
Table 1 Alarm Messages
Alarm Message Description/Cause Action
Source1 Fail Input Source 1 voltages are above or below acceptable thresholds. F, L, D, A
Source2 Fail Input Source 2 voltages are above or below acceptable thresholds. F, L, D, A
OF/UF Source frequencies are above or below user-adjustable thresholds. A
Shorted SCR1 One or more of the SCRs in STS1 have failed shorted. F, L, D, A
Shorted SCR2 One or more of the SCRs in STS2 have failed shorted. F, L, D, A
Open SCR1 One or more of the SCRs or fuses in STS1 have failed open. F, L, D, A
Open SCR2 One or more of the SCRs or fuses in STS2 have failed opened. F, L, D, A
Overload The RMS load current has exceeded rated switch current for >5
seconds.
F, L, D, A
Peak I1 OVLD The peak current through STS1 has exceeded the overload
threshold that inhibits source transfer.
F, L, D, A
Peak I2 OVLD The peak current through STS2 has exceeded the overload
threshold that inhibits source transfer.
F, L, D, A
Transfer Inhibit Uninterrupted transfer is inhibited due to input source failure,
sources out of sync, switch failure, or unit in bypass.
A
Out of Sync The input sources are not synchronized within the user-adjustable
phase difference (synchronization window).
A
Source1 CB1 Open Input breaker CB1 is not closed. A
Source2 CB2 Open Input breaker CB2 is not closed. A
Output CB3 Open Output breaker CB3 is not closed. A
Bypass CB4 Closed Bypass breaker CB4 is closed. A
Bypass CB5 Closed Bypass breaker CB5 is closed. A
Auto Rexfer Failed The switch has failed to transfer back to the preferred source after
the preferred source has been restored.
A
Power Supply Fault One or more of the redundant control power supplies has failed. D, A
Control Fuse Open One or more of the control power fuses has opened. F, L, D, A
Logic Failure The system has detected a control logic failure. D, A
Equip. Over Temp The system heat sink temperature has exceeded the design limits. A
Fan Failure One or more of the redundant cooling fans has failed. D, A
Auto Retransfer Primed The automatic transfer sequence back to the preferred source after
source failure has been initiated.
(status
message)
Auto Retransfer Disabled The feature of automatic transfer back to the preferred source after
source failure has been disabled (turned Off).
(status
message)
History Stored The History Status buffer has been frozen by the occurrence of one
of the designated alarms. (Press and hold Alarm Reset switch for 5
seconds to clear History Status buffer).
(status
message)