GE LP 33 Manual De Usuario

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OPM_LPS_3UO_30K_40K_0US_V010.doc

Operating Manual LP 33 Series 30 & 40 kVA

7.2.6

Complete shutdown of a parallel system

As a result of this procedure the parallel system is completely switched OFF and not powered.

NOTE !

This procedure involves all equipment powered by parallel system, to be shut down.

1. Perform the command total off on any one of the units.

2. Switch OFF the output switch Q1 (Pos. 0) on each unit.

3. Remove

the battery fuses F5, F6, F7 (and eventual external fuses in case of external battery) on

each unit.

4. In order to discharge the DC link capacitors, start once more

the inverter on each unit through the screen:
MENU/COMMAND MENU/INVERTER ON

COMMAND MENU

INVERTER ON *
INVERTER OFF

Remark: command

INVERTER ON will be enabled only when

the inverter voltage of each phase decreases

below 7 VAC (about 30 seconds).

INVERTER: U1=

U2= 7V U3= 7V
Frequency = 60.0Hz

Synchronized

Before proceeding to step 5, check on the display panel that

the DC link voltage (both polarities) Udcp and Udcn has reached
the minimum voltage of 5 VDC (about 30 seconds).

Udcp= 5V Udcn=

Ubp=0V

Ubn=0V O

Charge level = 0%
Autonomy =

0min

5. Switch OFF the inverter on each unit entering the screen:

MENU/COMMAND MENU/INVERTER OFF

MENU COMANDI

INVERTER ON
INVERTER OFF *

6. Switch OFF the mains power of each unit at the AC input distribution panel.

END OF PROCEDURE

CAUTION !

If the above procedure is not completely performed, it could cause

serious damages to the UPS.

WARNING !

In case the procedure described on step “4 - discharge DC link capacitors” cannot
be completely performed, the DC capacitors could be charged with dangerous

voltage for about 15 minutes.
Wait until capacitors are completely discharged before starting the UPS again.
Apart from the front door, do not open any other part of the UPS.