Modifications reserved Page 65/79
OPM_SGS_USM_M22_M30_2US_V010.doc User Manual SG Series 225 & 300 UL S2
7.2.4 Separate a UPS Unit from the Parallel System (System Redundancy)
NOTE:
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.
Initial status:
Load supplied from all Inverters of the Redundant
Parallel System.
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.
Synoptic Diagram of the unit to separate Synoptic Diagram of other units
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.
Synoptic Diagram of the unit to separate Synoptic Diagram of other units
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