GE Industrial Solutions LP 33U Series 10 & 20 kVA Operating Manual - Manual (Page 58)

Modifications reserved Page 58/63
OPM_LPS_3UO_10K_20K_1US_V010.doc Operating Manual LP 33U Series 10 & 20 kVA / 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 “Total Off” key on anyone of the parallel units.
2. Open the output switch Q1 (Pos. 0) on all UPS units.
3. Remove the “rectifier input fuses - F1, F2, F3” and the “battery fuses - F9, F10, F11 / F13, F14, F15”
(remove the external battery fuses in case of external battery) on all UPS 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” ( I ) key
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 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.