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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.
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".
Modifications reserved
OPM_SGS_USM_M75_M75_2US_V010.doc
END OF PROCEDURE
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
User Manual SG Series 750 UL S2 & SG Series 750 T12 UL S2
Page 62/71
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