UPS user manual
Utilizzo dell’UPS
OMS02083 REV. A 43
Alarm
A17 RETRANSFER BLOCK
Description The load is blocked on the bypass line.
Possible
causes
Very frequent changeovers due to load in-rush currents.
Static switch problems.
Solutions 1. Reset the system.
2. Check the in-rush currents of the loads.
3. If the alarm persists, contact our Technical Support Service.
Alarm
A18 MBCB 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
A19 OCB OPEN
Description The output isolator is open.
Possible
causes
Output isolator open.
Solutions 1. Check the status of the output isolator.
2. Check the functionality of the auxiliary contact of the isolator.
3. If the alarm persists, contact our Technical Support Service.
Alarm
A20 OVERLOAD
Description The current sensor has detected an overload at the output. If the alarm
persists, the thermal image protection will be activated (alarm A21).
Possible
causes
Output overload.
Measuring circuit failure.
Solutions 1. Check the loads connected to the UPS output.
2. Contact our Technical Support Service.
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