Reconnect A Ups Unit To A Parallel System - GE LP 33U Series Operating Manual

7.2.5 Reconnect a UPS unit to a Parallel System

WARNING !
Before connecting hazardous voltages, make sure that:
• The connection to the electrical system has been performed by qualified personnel;
• The equipment frame has been correctly grounded to the main earth;
• Make sure that utility input protection is removed;
• All the panels removed to allow the UPS connection have been correctly reinstalled;
• The UPS switches Q1 and Q2 are open (Pos. 0);
• The "battery breaker" Q3 is OFF.
This procedure must be performed when the load is supplied by the other units of the UPS Parallel
System and an additional unit must be switched ON and connected to the parallel bus in order to share
the load with each other.
This unit must be completely switched OFF and not powered.
1. Switch-ON the utility voltage from the input distribution (both rectifier and bypass if separated)
on this UPS unit.
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.
2. Close output switch Q1 (Pos. I) on this UPS unit.
Verify on this UPS unit, selecting the screen METERING/BOOSTER/Vp
and Vn, that the booster voltage has reached about 215 Vdc.
3. Insert the inverter by pressing "Inverter ON" ( I ) key on this UPS unit.
When the inverter will be synchronized, the unit will be
automatically connected with the parallel bus bar and the load will
be shared with the other units.
LED Alarm turn Off and the LED Operation must be lit.
The synoptic diagram, on all UPS units, must display the status
"LOAD SUPPLIED BY INVERTER".
Modifications reserved
OPM_LPS_3UO_50K_60K_1US_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
Home\Meter
BOOSTER
f :
L1 :
L2 :
L3 :
Vp :
Vn :
Operating Manual LP 33U Series 30 & 40 kVA
60.0 Hz
120 V
120 V
120 V
215 V
215 V
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