Modifications reserved Page 61/66
OPM_LPS_3UO_80K_M10_1US_V010.doc User Manual LP33 Series 80 & 100 UL S1
7.2.6 Complete Parallel System shutdown
As a result of this procedure the Parallel System is completely switched OFF and not powered.
NOTE !
Follow this procedure only in case the Parallel System and the load must be
completely powered-down.
1. Press “Load Off” key on anyone of the parallel units.
2. Open the output switch Q1 (Pos. 0) on all UPS units.
3. Switch OFF (Pos. 0) the “Battery Breaker” from battery cabinets of all the units.
The acoustical alarm is activated, press “MUTE” key to reset it.
4. 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 5, 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.
5.
Disconnect the inverter, on all UPS units, by pressing “Inverter OFF” ( O ) key and hold until the
LED Inverter (7) turns OFF.
6. Switch OFF (Pos. 0) the utility power, on all UPS units, at the AC input distribution panel.
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 “4 - 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.
Apart from the front door, do not open any other part of the UPS.
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