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3.9.5 Interface to External Bypass for single unit
If the UPS system is equipped with an External Maintenance Bypass Switch, connect the NO (Normally
Open) voltage free auxiliary contact from the External Bypass Switch to X4 - 1, 2 of P27 – IM0108 -
Interface for External Bypass inserted in the Connectivity Rack.
When this NO (Normally Open) contact closes, the Inverter Output Contactor K7 opens and the Load
transfer to Inverter will be inhibited.
Fig. 3.9.5-1 Interface to External Bypass for single unit
3.9.6 Connections to External Bypass switch in case of RPA Parallel System
In a parallel system, this connection must be made between each UPS to a
separate AUX contact of the External Maintenance Bypass Switch.
Fig. 3.9.6-1 Connections to External Bypass switch in case of RPA Parallel System
Modifications reserved
OPM_SGS_ISG_M75_M75_2US_V010.doc
SG Series 750 & SG Series 750
T12 has to be interfaced to the
External
Bypass
Contacts (NO) for safety reasons.
This will prevent contactor K7
from closing when the external
bypass breaker is on.
The connections shown in the
diagram are mandatory.
Installation Guide SG Series 750 UL S2 & SG Series 750 T12 UL S2
Auxiliary
Page 37/49
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