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

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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,
exception made if the battery is included in the same cabinet.
NOTE !
This procedure involves all equipment powered by parallel system, to be shut
down.
1. Perform the command total off on each unit.
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 minimum voltage of 5 VDC (about 30 seconds).
5. Switch OFF the inverter on each unit entering the
screen: MENU/COMMAND MENU/INVERTER OFF
Attention: to switch OFF permanently the inverter the key
Enter must be pressed 2 times.
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.
OPM_LPS_33E_10K_30K_4CN_V010.doc
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Inverter:
U2= 7V
Udcp= 5V
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Operating Manual LP 33 / 10-20-30 kVA
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GE
INVERTER ON ‫٭‬
INVERTER OFF
U1= 7V
U3= 7V
Udc Voltage
Udcn= 5V
INVERTER ON
INVERTER OFF ‫٭‬