LEGRAND UPS, User Manual

Page: 54 / 164

UPS user manual
Manuel de l’utilisateur de l’ASI
Utilizzo dell’UPS
54 OMG38225 REV. B
Alarm A30 COMMON ALARM
Description Common alarm.
Possible
causes
At least one alarm is present.
Solutions 1. Check which alarms are present and carry out the indicated
procedures.
Alarm A31 MBCB BUS CLOSED
Description The manual bypass isolator is closed.
Possible
causes
Manual bypass isolator closed.
Solutions 1. Check the status of the manual bypass isolator.
2. Check the functionality of the auxiliary contact of the isolator.
3. If the alarm persists, contact our Technical Support Service.
Alarm
A32 EPO BUS CLOSED
Description The system is blocked due to the activation of the emergency power off
button.
Possible
causes
Activation of the (local or remote) emergency power off button.
Solutions 1. Release the emergency power off button and reset the alarm.
2. If the alarm persists, contact our Technical Support Service.
Alarm A33 ASYMMETRIC LOAD
Description The positive and negative voltages measured on the DC capacitors
towards the middle point are different.
Possible
causes
Possible failure on the measuring circuit.
Possible fault of DC capacitors.
Solutions 1. Reset the system.
2. If the alarm persists, contact our Technical Support Service.
Alarm A34 SERVICE REQUIRED
Description A UPS check is necessary.
Possible
causes
Possible UPS fault.
Solutions 1. If the alarm persists, contact our Technical Support Service.