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7.2.7 Restore to normal operation after "Load Off"
NOTE !
Make sure the all Units of the Parallel System to be status of the activation of "Load
Off", i. e. UPS Output Switches Q1 closed (Pos. I), External Maintenance Bypass
Switches (option) open (Pos. O) and Battery Circuit Breakers connected (Pos. I).
If eBoost™ option is available, make sure that eBoost™ Operation Mode is disabled
before starting the shutdown procedure.
View of the synoptic diagram, on all UPS units, after
pressing the "Load Off" key.
• All Contactors are open.
• Rectifier, Inverter and Static-Switch shutdown.
• LED Alarm is lit.
1.
Reset "Load Off" of the Parallel System.
Restore the command "Load Off" by entering the
screen: COMMANDS / RESET TOTAL OFF
The Load is supplied by the Utility through the Automatic
Bypass of all Units.
Rectifiers start automatically, blinking LED 3 (Rectifier ON)
indicates Soft-start.
At the end of Rectifier Soft-start, the LED 3 (Rectifier ON)
remains lit. LED Alarm is lit.
The Synoptic Diagram, on all UPS units, must display the
status "LOAD SUPPLIED BY AUTOMATIC BYPASS".
3
Insert the Inverter by pressing the "Inverter ON" ( I ) key on first unit.
Soft-start of Inverter, indicated with blinking LED 5 (Inverter available).
At the end of Soft-start the LED 5 (Inverter available) remains lit.
In case of sufficient output power, the output will transfer to Inverter.
LED Alarm turn Off and the LED Operation must be lit.
The Synoptic Diagram, on first unit, must display the
status "LOAD SUPPLIED BY INVERTER".
4.
Insert the Inverter by pressing the "Inverter ON" ( I ) key on all other units.
(Do not start the next Inverter until the sequence of the previous ends)
Soft-start of Inverter, indicated with blinking LED 5 (Inverter available).
At the end of Soft-start the LED 5 (Inverter available) remains lit.
As soon as the output power of the Inverters is sufficient
to supply the Load, the output of the units with running
Inverter will transfer to Inverter.
LED Alarm turn Off and the LED Operation must be lit.
The Synoptic Diagram
the status "LOAD SUPPLIED BY INVERTER".
Modifications reserved
OPM_SGS_USM_M75_M75_2US_V010.doc
, on all UPS units, must display
END OF PROCEDURE
Home\Commands
COMMANDS
RESET TOTAL OFF
REQUEST TOTAL OFF
User Manual SG Series 750 UL S2 & SG Series 750 T12 UL S2
Page 64/71
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