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UPS for 400 Vac Grid, Installation Guide, doc. rel. 3.0
7.
Procedure: Maintenance Bypass Mode
In maintenance Bypass mode, the UPS does not to supply power to the load and UPS is isolated
from the mains power. This enables a technician, after turning off ALL the input, output and
battery circuit breakers, to work safely on the UPS. The technician can perform full maintenance
procedures, load testing and even replace the unit without any interruption of power to the load.
This mode of operation is also commonly referred to as "wrap around maintenance bypass".
Verify 0V across ALL terminals before disconnecting the system.