OPM_LPS_33E_10K_30K_4CN_V010.doc 65/82 Operating Manual LP 33 / 10-20-30 kVA
8.2.2 Parallel UPS shutdown with load transfer on manual bypass (Q2)
The purpose of this procedure is to supply the load directly by mains through manual bypass Q2.
This procedure is normally performed when the UPS must be completely switched OFF for
maintenance or service purpose, performed by an authorised Service Centre.
INVERTER ON
> INVERTER OFF ٭
1. 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.
The output will be supplied by the mains through all
automatic bypass.
LP 33 20kVA P1
APPLICAT. ON UTILITY
2. Switch ON the maintenance bypass Q2 (I) on each unit.
LP 33 20kVA P1
APPL. ON MANUAL DEV.
3. Switch OFF the output switch Q1 (0) on each unit.
4. Perform the command total off on each unit.
5. 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.
> INVERTER ON ٭
INVERTER OFF
6. In order to discharge the DC link capacitors, start once
more the inverter on each unit 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).
Before proceeding to step 7, 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).
Udc Voltage
Udcp= 5V Udcn= 5V
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