OPM_LPS_33E_10K_30K_4CN_V010.doc 62/82 Operating Manual LP 33 / 10-20-30 kVA
8.1.4 Complete shutdown
As a result of this procedure the UPS 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 UPS, to be shut down.
1. Perform the command total off.
2. Switch OFF the output switch Q1 (Pos. 0).
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).
> INVERTER ON ٭
INVERTER OFF
4. In order to discharge the DC link capacitors, start once
more the inverter through the screen:
MENU/COMMAND MENU/INVERTER ON
Inverter: U1= 7V
U2= 7V U3= 7V
Remark: command INVERTER ON will be enabled only
when the inverter voltage of each phase
decreases below 7 VAC (about 30 seconds).
Udc Voltage
Udcp= 5V Udcn= 5V
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).
INVERTER ON
> INVERTER OFF ٭
5. Switch OFF the inverter by entering the screen:
MENU/COMMAND MENU/INVERTER OFF
Attention: to switch OFF permanently the inverter the ke
Enter must be pressed 2 times.
6. Switch OFF the mains power 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.
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