Modifications reserved Page 57/66
OPM_LPS_3UO_80K_M10_1US_V010.doc User Manual LP33 Series 80 & 100 UL S1
6. In order to discharge the DC link capacitors, insert the inverter by pressing “Inverter ON”
on all UPS units.
`Home\Meter
INVERTER
f : 60.0 Hz
L1 : 7 V
L2 : 7 V
L3 : 7 V
T : OK
SYNCHRONIZED
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 : 60.0 Hz
L1 : 120 V
L2 : 120 V
L3 : 120 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 utility 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 a minimum of 5 minutes.
Wait until capacitors are completely discharged before starting the UPS again.
The UPS cabinet contains parts electrically live.
Apart from the front door, do not open any other part of the UPS.
NOTE !
With separate utility inputs, it’s possible to disconnect utility rectifier.
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