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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= 7V
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= 5V
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.