Modifications reserved
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OPM_SGS_USM_M75_M75_2US_V010.doc
User Manual
SG Series 750 UL S2 & SG Series 750 T12 UL S2
7.2.5 Reconnect a UPS unit to a Parallel System
Initial situation:
The
Load
is still powered by the other units supplying the
Parallel Bus
.
This UPS unit will be powered on and connected to the
Parallel Bus
in order to share
the
Load
with each other's.
If
eBoost™
option is available, make sure that
eBoost™ Operation Mode
is disabled
before starting the shutdown procedure.
WARNING !
The
High Speed Bus Cable Connecting J52
(A) and
J62
(B) in any case cannot be
connected or disconnected after the system has been powered ON.
The
Bus Terminals
must be properly connected before powering the additional unit.
Open the front door, of the Unit to reconnect, and make sure that:
•
All the
connections
to the input/output bus bars of the UPS have been made correctly
•
The
protection panels
are fastened in their correct position
•
The
UPS Output Switch Q1
,
Input Circuit Breaker CB4
and
Battery Circuit Breaker
are open (Pos. O).
1. Switch-ON the Utility Voltage, on the Unit to reconnect, from the input distribution (both
Rectifier and bypass if separated).
At this stage the electronic power supply is switched ON.
Overall test results
Test1 OK
Test7 OK
Test2 OK
Test8 OK
Test3 OK
Test9 OK
Test4 OK
Test10 OK
Test5 OK
Test11 OK
Test6 OK
The UPS performs a
SELFTEST
.
A successful termination of the tests will be indicated with
Overall test results
“OK”
.
Commissioning cannot be continued should one or more tests
result to be negative.
Please contact in this case your
Service Center
.
With
“Overall test results - OK”
the
Synoptic Diagram
is displayed.
LED 1 (Utility Rectifier OK)
and
LED 2 (Utility Bypass OK)
must be ON.
The buzzer sounds,
press the
“MUTE”
key to reset
acoustical alarm
.
LED Alarm
remains lit.
2. Close the UPS Output Switch Q1 (Pos. I) on the Unit to reconnect
.
Input Circuit Breaker CB4
closes and
Rectifier
starts automatically.
Rectifier
starts automatically, blinking
LED 3 (Rectifier ON)
indicates Soft-start.
At the end of
Rectifier
Soft-start the
LED 3 (Rectifier ON)
remains lit.
3. Connect the Battery on the Unit to reconnect.
LED 4b
(Charging Battery)
should be lit indicating
battery charge
.
ATTENTION !
Before performing this operation, the
LED 3 (Rectifier ON)
must remain lit, thus
indicating that the DC-Link has reached floating voltage (540Vdc)!
4. Insert the Inverter by pressing the “Inverter ON” ( I ) key on the Unit to reconnect.
The
Inverter
will start up.
LED 5 (Inverter available)
must be blinking
In a short time, when the
Inverter voltage
is confirmed, the
LED 5 (Inverter available)
will stop blinking and
stay fixed lit.
The
Load
will be automatically shared between the
Parallel Units
and this
Inverter
.
LED Alarm
turn Off.
LED Operation
must be lit.
Verify on display screen that the load should be equally
shared between the parallel units.
The
Synoptic Diagram
, on all UPS units, must display the status
“
LOAD SUPPLIED BY INVERTER
”
.
END OF PROCEDURE
