Complete Shutdown Of A Parallel System - GE LP 33 Series Operating Manual

8.2.6

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 rectifier-input fuses F1, F2, F3 and the battery fuses F9, F10, F11 (remove the
external battery 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
Remark: command INVERTER ON will be enabled only when
the inverter voltage of each phase decreases
below 7 VAC (about 30 seconds).
Before proceeding to step 5, check on the display panel that
the DC link voltage (both polarities) Udcp and Udcn has reached
the max. voltage of 5 VDC (about 30 seconds).
5. Switch OFF the inverter on each unit entering the screen:
MENU/COMMAND MENU/INVERTER OFF
6. Switch OFF the mains power of each unit at the AC input distribution panel.
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.
Modifications reserved
OPM_LPS_33E_10K_30K_4GB_V030.doc
END OF PROCEDURE
COMMAND MENU
INVERTER ON
INVERTER OFF
INVERTER: U1= 7V
U2= 7V U3= 7V
Frequency = 50.0Hz
Synchronized
Udcp= 5V Udcn= 5V
Ubp=0V Ubn=0V
Charge level = 0%
Autonomy = 0min
COMMAND MENU
INVERTER ON
INVERTER OFF
Operating Manual LP 33 Series / 10-20-30 kVA
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