LEGRAND VR61-18 Manuel De L'utilisateur page 51

Alarm A17
Description The load is blocked on the bypass line.
➢ Very frequent changeovers due to load in-rush currents.
Possible
causes
➢ 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
Description The manual bypass isolator is closed.
➢ Manual bypass isolator closed.
Possible
causes
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
Description The output isolator is open.
➢ Output isolator open.
Possible
causes
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
Description The current sensor has detected an overload at the output. If the alarm
persists, the thermal image protection will be activated (alarm A21).
➢ Output overload.
Possible
causes
➢ Measuring circuit failure.
Solutions 1. Check the loads connected to the UPS output.
2. Contact our Technical Support Service.
Manuel de l'utilisateur de l'ASI
RETRANSFER BLOCK
MBCB CLOSED
OCB OPEN
OVERLOAD
UPS user manual
Utilizzo dell'UPS
OMP06145 REV. D 51