Front panel
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JUD408312 Rev.B JSE410920 22/07/08
exceeding 200%)
Possible causes: 1) Problems on the load
2) Distribution problems downstream of the UPS
A12 STOP MAX CURRENT
= Inverter bridge stopped for max current
Possible causes: 1) Short circuits for more than 5 sec. at the UPS
output
2) Distribution problems downstream of the UPS
It is possible, after having verified the status of the UPS, to reset this alarm by
means of the front panel (see menu SPECIAL).
A13 INV OUT TOLERAN
= Inverter output voltage out of tolerance
Possible causes: 1) Intervention of the inverter current limitation for
excessive load (more than 200%)
2) Inverter failure
3) Inverter switched off (see alarm A12 or A25)
A14 BYPASS WR SEQUEN
= Bypass phase rotation not correct (3 ph. output
only)
A15 BYPASS FAULT
= Emergency line not available for the bypass
Possible causes: 1) Emergency mains failure
2) Distribution problems upstream of the UPS
3) SBCB open
4) Wrong input phase rotation (alarm A14)
A16 BYPASS Æ LOAD
= Load fed by bypass
Possible causes: 1) Inverter overload
2) Thermal image intervention
3) Forced commutation due to the bypass switch
operation (alarm A22)
4) Inverter failure
5) Load retransfer blocked on bypass (alarm A17)
A17 RETRANSFER BLOCK
= Retransfer between bypass and inverter blocked,
load on bypass
Possible causes: 1) Excessive repeated overloads on inverter
It is possible, after having verified that the load is correct, to reset the UPS, and
switch back the load to the inverter (see menu SPECIAL).
A18 MBYP CLOSE
= Manual bypass breaker closed (the inverter is
shutdown)
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