GE LP 33 Series - Reconnect a UPS Unit to a Parallel System

Modifications reserved Page 88/103
OPM_LPS_33E_60K_M12_2GB_V010.doc Operating Manual LP 33 Series 60-80-100-120 kVA / S2
8.2.5 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 mains 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 external battery fuses are removed.
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 mains voltage from the input distribution (both rectifier and bypass if separated)
on this UPS unit.
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 Centre.
2. Insert the external battery fuses on this unit.
In case of GE battery cabinet: insert the fuses in their place and close fully the cover of fuse-holder by
using correctly the handle.
3. Close output switch Q1 (Pos. I) on this UPS unit.
`Home\Meter
BOOSTER
f : 50.0 Hz
L1 : 397 V
L2 : 395 V
L3 : 393 V
Vp : 400 V
Vn : 400 V
Verify on this UPS unit, selecting the screen METERING/BOOSTER/Vp
and Vn, that the booster voltage has reached about 400 Vdc.
4. Insert the inverter by pressing “Inverter ON” ( I ) key on this UPS unit.
When the inverter will be synchronised, 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”.
END OF PROCEDURE