LEGRAND BSK93, Operating Manual

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UPS user manual
Manuel de l’utilisateur de l’ASI
Utilizzo dell’UPS
62 OMP06263 REV. B
Alarm A55 PARALLEL CABLE DISCONNECTED
Description Parallel cable doesn't communicate.
Possible
causes  Parallel cable disconnected or damaged.
Solutions 1. Check the connection of cable
2. Contact our Technical Support Service.
Alarm A56 MAINS UNBALANCED
Description The rectifier input voltage is unbalanced.
Possible
causes  Problems on the LV or MV distribution network
 Defect of the measuring circuit
Solutions 1. Check the input voltage
2. Contact our Technical Support Service.
Alarm A57 INVERTER CONTACTOR FAILURE
Description The inverter conctactor is fault.
This alarm is only active when the contactor is installed an anabled
through eeprom manager.
Possible
causes  Aux contactor Fault.
 Wiring circuit Fault or PCB Fault.
Solutions 1. Check the auxiliary contact functions, check the interconnection
cables or PCB.
2. Contact our Technical Support Service.
Alarm A58 INVERTER CURRENT UNBALANCED
Description The inverter’s bridge currents are not balanced.
Possible
causes  Possible problems in the inverter bridge stage.

Anomaly of the system control.
Solutions 1. Contact our Technical Support Service.
Alarm A59 RELAY BACKFEED ON
Description The backfeed protection has been activated. Alarms present only in the
history log.
Possible
causes  Problems on the bypass static switch
Solutions 1. Check the static switch thyristors.
2. Contact our Technical Support Service.