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Relay functions are described below:
Relay
Function
ACFR (AC failure relay)
Contacts change position if the rms value or frequency of the mains
voltage is beyond their limits.
BYPR (Bypass relay)
Contacts change position if the UPS is working in the bypass mode
BUVR (Battery under voltage
relay)
Contacts change position if the battery voltages are critically low to
feed the load and the load power is about to be interrupted
SBFR (secure bus failure relay)
Contacts change position, if the output voltage disappears
