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OPM_SGS_USM_M40_M50_2US_V010.doc
User Manual
SG Series 400 & 500 UL S2
7.2.4 Separate a UPS Unit from the Parallel System (System Redundancy)
NOTE:
The
Load
is powered by the
UPS Redundant Parallel System
.
One UPS unit of the
Parallel System
has to be turned Off, while the
Load
is shared
between the other units supplying the parallel bus.
If
eBoost™
option is available, make sure that
eBoost™ Operation Mode
is disabled
before starting the shutdown procedure.
WARNING!
The control bus cable connecting
J52 (A)
and
J62 (B)
cannot be connected or
disconnected after the system has been powered on.
Initial status
:
Load supplied from all Inverters of the Redundant
Parallel System
.
1. Disconnect the Inverter by pressing the
“
Inverter OFF
”
( O ) key and hold until the LED 5
(Inverter available) turns OFF on the Unit to separate
.
With
redundant system
, pressing the key OFF the
Inverter
shuts down and it will stay OFF.
If by pressing the key
“O”
the
Load
is transferred to the
Utility
and the
Inverter
remains operating, it means
the system is not redundant.
In this case is not possible to switch-OFF one unit without transferring the
Load
on
Utility
.
•
Load
supplied from
Inverter(s)
of the other Unit(s) of the
Parallel System.
Synoptic Diagram of the unit to separate
Synoptic Diagram of other units
2. Open the UPS Output Switch Q1 (Pos. O) on the Unit to separate.
•
LED Alarm
is lit and the
LED Operation
is Off.
•
LED 6 (Inverter ON) and LED 7 (Q1 closed)
must be Off.
Synoptic Diagram of the unit to separate
Synoptic Diagram of other units
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