GE Industrial Solutions SG Series 750 T12 UL S2 User Manual - Manual (Page 61)

Modifications reserved Page 61/71
OPM_SGS_USM_M75_M75_2US_V010.doc User Manual SG Series 750 UL S2 & SG Series 750 T12 UL S2
7.2.4 Separate a UPS unit from the Parallel System (System Redundancy)
INITIAL SITUATION:
The Load is powered by the UPS Redundant Parallel System.
One UPS unit of the Parallel System has to be turned Off, while the Load is shared
between the other units supplying the parallel bus.
If eBoost™ option is available, make sure that eBoost™ Operation Mode is disabled
before starting the shutdown procedure.
WARNING!
The control bus cable connecting J52 (A) and J62 (B) cannot be connected or
disconnected after the system has been powered ON.
1. Disconnect the Inverter by pressing the “Inverter OFF” ( O ) key and hold until the LED 5
(Inverter available) turns OFF on the Unit to separate.
With Redundant System, pressing the key OFF the Inverter shuts down and it will stay OFF.
(If by pressing the key “O” the Load is transferred to the Utility and the Inverter remains operating, it
means the system is not redundant.
In this case is not possible to switch-OFF one unit without transferring the Load on Utility).
Load supplied from Inverter(s) of the other Unit(s) of the Parallel System.
2. Open the UPS Output Switch Q1 (Pos. O) on the Unit to separate.
LED Alarm is lit and the LED Operation is Off.
LED 6 (Inverter ON) and LED 7 (Q1 closed) must be Off.
` Home\Commands
COMMANDS
RESET TOTAL OFF
REQUEST TOTAL OFF
3. Perform the command “Load Off” on the Unit to
separate only when the LED 7 (Q1 closed) is Off.
Perform the command “Load Off” by entering the screen
(see Section 7.5): COMMANDS / REQUEST TOTAL OFF
The rectifier shuts down.
V 
4. Disconnect the Battery from the UPS (only for UPS configuration without External Battery
Breaker).
` Home\Meter
BATTERY
V 15 V
I 5.0 A
T +25° C
Charge level 80 %
Autonomy 12 Min
Wait a minimum of 5 minutes for DC-Link
Capacitors to discharge.
Before you proceed with any kind of intervention on
the UPS, make sure the DC-Link voltage be less than
15Vdc.
5. Disconnect the Utility, only on this unit, from the input distribution only when the DC-Link
voltage results to be below 15Vdc.
END OF PROCEDURE
DANGER !
It will take 5 minutes for the DC capacitors to discharge.
Open only the front door, do not open any other part of the UPS.
NOTE !
For any further intervention contact your Service Center.