23
BYPASS FOR MAINTENANCE SWMB
Series of operations to be carried out to place the UPS in maintenance by-pass to carry out maintenance operations on
equipment while maintaining the fed load:
Status I
NORMAL OPERATION
Status II
SWMB switch closed (the control logic automatically disables the inverter)
Status III
All machine switches open.Only the SWMB switch is kept closed (by-pass maintenance line).The signal panel remains
off.
With the load powered through the maintenance line (during maintenance) any disturbance such as a blackout on
the power line of the UPS would have repercussions on the powered equipment (under this condition the operation
batteries are dis-activated
When the maintenance operations are concluded restart the UPS: close SWIN, SWBY, SWOUT and then open
SWMB. The UPS will return to NORMAL OPERATION
.
SWOUT
SWIN
SWMB
INVERTER
BY
PA
SS
RADDRIZZATORE
RECTIFIER
RETE/MAINS
BATTERIA/BATTERY
CARICO/LOAD
SWBY
FB +/-
SWOUT
SWIN
SWMB
INVERTER
BYPASS
SWBY
RADDRIZZATORE
RECTIFIER
RETE/MAINS
CARICO/LOAD
BATTERIA/BATTERY
FB +/-
SWOUT
SWIN
SWMB
INVERTER
BYPASS
SWBY
BATTERIA/BATTERY
RETE/MAINS
CARICO/LOAD
RADDRIZZATORE
RECTIFIER
FB +/-