GE Digital Energy LP 33 - Start-Up an Additional Unit in a Parallel System

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OPM_LPS_33E_10K_30K_4CN_V010.doc 69/82 Operating Manual LP 33 / 10-20-30 kVA
8.2.5 Start-up an additional unit in a parallel system
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 OFF (Pos. 0);
• The input fuses rectifier F1, F2, F3 and battery fuses F9, F10, F11 is removed.
This procedure must be performed when the load is supplied by the other units of the UPS 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 (exception made if the batteries are
included in the UPS cabinet).
1. Insert the rectifier input fuses F1, F2 and F3 of this unit.
EXECUTING SELF TEST
00000000000
2. Switch ON the mains power at the input distribution
panel.
As a result the UPS performs a self-test and the LCD will
show the following screen:
SELF TEST
SELF TEST OK!
In case the alarm “4410 - Mains bypass out of tolerance” persists, check
the phases rotation of the input mains.
3. Insert the battery fuses F9, F10 and F11 (insert the external battery fuses in case of
external battery) on this unit.
4. Switch ON the output switch Q1 (Pos. I) on this unit.
LP 33 20kVA P2
APPLICAT. ON UTILITY
Udc Voltage
Udcp=400V Udcn=400V
Verify, selecting the screen METERING/Udcp and Udcn,
that the booster voltage has reached about 400 VDC of this
unit.
5. Switch ON the inverter of this unit entering the screen:
MENU/COMMAND MENU/INVERTER ON
> INVERTER ON ٭
INVERTER OFF
LP 33 20kVA P2
APPLICATION ON UPS
When the inverter will be synchronised, the unit will be
automatically connected with the parallel busbar and the
load will be shared with the other units.
The main screen of each unit will display:
APPLICATION ON UPS