Complete Parallel System Shutdown - GE 8 Series Operating Manual

8.2.6 Complete Parallel System shutdown

NOTE !
Follow this procedure only in case the UPS Parallel System and the load must be
completely powered-down.
Initial situation:
The load is powered by SitePro Parallel System supplying the parallel bus.
With the UPS Parallel System in normal operation and the inverters supplying the load, the switches Q1
and Q4 are closed (Pos. I), Q2 are open (Pos. 0), and the battery fuses F8 – F9 are inserted.
The synoptic diagram, on all UPS units, must display the status
"load supplied by inverter".
1. Disconnect the inverter by pressing "Inverter OFF" ( O ) key and hold until the LED Inverter (5)
turns OFF on all UPS units.
At no redundancy, the system will transfer to mains supply.
LEDs Alarms are lit and the LEDs Operation are Off.
The synoptic diagram, on all UPS units, must display the status
"LOAD SUPPLIED BY AUTOMATIC BYPASS".
2 Press "Load Off" key on anyone of the parallel units.
The output contactor K6 on each unit open, and the UPS Parallel System output will be powered down.
3. Open the input rectifier switch Q4 (Pos. 0) on all UPS units.
LED Alarm blinks and the acoustical alarm is activated, press "MUTE" key to reset it.
LED Alarm remains lit.
4. Open the output switch Q1 (Pos. 0) on all UPS units.
5. Disconnect the battery removing the battery fuses F8 – F9 on all UPS units.
The electronic boards and the control panel are still powered from AC power supply through the plug X8 on
the "P1 - Power Interface" (Warning! This board will remain powered from the mains throughout this
procedure!).
The acoustical alarm is activated, press "MUTE" key to reset it.
6. Disconnect the mains, on all UPS units, from the input distribution only when the DC-Link
voltage results to be below 20 Vdc (see screen METER / BATTERY / V).
The UPS Parallel System is now voltage free, except for battery voltage in case the battery is integrated in
the UPS cabinet.
All the LEDs and the LCD display on the panels must be OFF.
NOTE !
Follow this procedure only in case the UPS system and the load must be completely
powered-down.
Modifications reserved
OPM_SPE_XXX_10K_40K_8GB_V020.doc
Page 83/99
Operating Manual SitePro 10-15-20-30-40 kVA / S8