Front panel
6
OM226131 Rev. A
intermittent
2) Mains variation speed not acceptable for the UPS (for
load protection reasons)
A13 INV OUT TOL
= Inverter output voltage out of tolerance
Possible causes: 1) Intervention of the inverter current limitation for
excessive load (more than 200%)
2) Inverter failure
A14 OVERLOAD
= Inverter overload (load exceeding 100%). The
thermal image protection is started
A15 BYP FAULT
= Emergency mains not available
Possible causes: 1) Emergency mains failure
2) Distribution problems upstream of the UPS
3) SBCB open
4) Wrong input phase rotation
A16 BYP FEED LOAD
= Load fed by bypass
Possible causes: 1) Inverter overload
2) Thermal image intervention
3) Forced commutation due to the bypass switch
operation
4) Inverter failure
A17 RETR BLOCK
= Re-transfer 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)
A19 OCB OPEN
= UPS output breaker open
A20 FANS FAILURE
= Optional
A21 HIGH TEMP
= High temperature on the inverter and/or rectifier
bridge
Possible causes: 1) Excessive load
2) Failure or malfunctioning of the cooling system