16 EN
MASTERYS GP4 60-160 kVA - Ref.: IOMMASGPXX07-EN 05
Additional requirements for parallel confi guration
The UPS is designed for transient overvoltages in category II installations. If the UPS is part of a
parallel configuration and the total output rated current is > 400 A, additional external protection
must be provided.
The phase rotation of aux mains and output cables must be the same for each unit.
System shutdown switch
H
should always be installed in the external distribution cabinet and
recognised as an emergency shutdown switch (red handle). If this switch is far from the UPS or in
another room a remote shutdown button shall be installed near the UPS.
Before turning on an individual unit ensure that the relevant unit output switch
G
is closed.
Before opening unit output switch
G
ensure that the relevant unit is turned off.
If unit output switches
G
are present, it is advisable to connect a normally open early break
contact from the switch to the unit’s parallel board.
If an external maintenance bypass switch
F
is present, it is advisable to connect a normally
closed early make contact from the switch to the parallel board of the concentrator unit.
If a system shutdown switch
H
is present, it is advisable to connect a normally closed early
break contact from the switch to the parallel board of the concentrator unit.
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