Modifications reserved Page 52/86
OPM_SGS_USM_M40_M50_1US_V020.doc Operating Manual SG Series 400 & 500 kVA
7.3 PROCEDURES FOR PARALLEL SYSTEM
7.3.1 Parallel System start-up
Verify on all Units, with open front door: Switches Q1 and Q2 must be open (Pos. O).
1. Connect the Utility power on all UPS’s.
(In case of separate inputs for Rectifier and Bypass, connect both).
• Power supply starts up. Indicated with flashing alarm and buzzer sounds.
• LED’s as indicated will be lit.
•
Press mute, to reset alarm and buzzer.
First operated unit All other units of the system
2. Close Q1 (Pos. I) on all Units.
• When closing Q1 on the last unit of the parallel system, the Bypass of all Units
connects to the Load.
• Rectifiers start automatically, blinking LED indicates Soft-start.
• At the end of Rectifier Soft-start, the LED remains lit.
• LED’s service check turn OFF.
First operated unit All other units of the system
Proceed with step 3 only when the
LED 3 remains constantly lit on all
units of the parallel system.
3. Connect the Battery to all Units by
closing the external Battery Breaker
Release in sequence.
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LED 3
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