STS/MBS Operation
Copyright © 2008-2010 Eaton Corporation. All Rights Reserved.
IPN 997-00012-68D February 2010
61
MBS Position Function Power Source
Mains Bypass
(MBP)
Load is powered through
the MBS by the Mains AC.
STS can now be removed
from the system.
Mains AC power
the load via MBS
contact 1.
Mains Static
Switch (MSS)
Mains AC powers the load.
The inverters are ON, but
do not provide any load
power. Inverter tests can
be made.
Mains AC power
the load.
Normal
Operation
(NORM)
Usually, the system
operates with MBS in this
position. Only in this
position does the transfer
action between Mains AC
and inverter take place.
The system output
power is from
either Mains AC
or Inverter
according to the
programmable
priority.
Inverter Static
Switch (ISS)
Mains AC is disconnected
from the system. This is
achieved by opening the
Backfeed contactor.
Inverter powers
the load.
Inverter Bypass
(IBP)
Load is powered through
the MBS by the inverters.
STS can now be removed
from the system.
Inverter powers
the load via MBS
contact 2.
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