Modifications reserved Page 85/103
OPM_LPS_33E_60K_M12_2GB_V010.doc Operating Manual LP 33 Series 60-80-100-120 kVA / S2
6. In order to discharge the DC link capacitors, insert the inverter by pressing “Inverter ON”
on all UPS units.
`Home\Meter
INVERTER
f : 50.0 Hz
L1 : 7 V
L2 : 7 V
L3 : 7 V
T : OK
SYNCHRONISED
Remark:
Command INVERTER ON will be enabled only when the inverter
voltage of each phase decreases below 7 Vac (about 30 seconds).
`Home\ Meter
BOOSTER
f : 50.0 Hz
L1 : 397 V
L2 : 395 V
L3 : 393 V
Vp : 5 V
Vn : 5 V
Before proceeding to step 7, check on the display panel that the DC
link voltage (both polarities) Vp and Vn has reached the max.
voltage of 5 Vdc (about 30 seconds).
The acoustical alarm is activated, press “MUTE” key (from Home
screen) to reset it.
7.
Disconnect the inverter, on all UPS units, by pressing “Inverter OFF” ( O ) key and hold until the
LED Inverter (7) turns OFF.
The load is now powered directly by mains through all
MANUAL BYPASS Q2.
The synoptic diagram, on all UPS units, must display the
status “LOAD SUPPLIED BY MANUAL BYPASS Q2”.
END OF PROCEDURE
WARNING !
If the above procedure is not completely performed, it could cause
serious damages to the UPS.
In case the procedure described on step “6 - Discharge DC link capacitors” cannot
be completely performed, the DC capacitors could be charged with dangerous
voltage for min.5 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.
NOTE !
With separate mains inputs, it’s possible to disconnect mains rectifier.
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