3.8.5 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. 3.8.5-1 Interface to External Bypass for single unit
SG Series 225 & 300
has to be
interfaced to the
External Bypass
Auxiliary 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
.
3.8.6 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. 3.8.6-1 Connections to External Bypass switch in case of RPA Parallel System
Modifications reserved
Page 29/40
OPM_SGS_ISG_M22_M30_2US_V010.doc
Installation Guide
SG Series 225 & 300 UL S2
