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OPM_SGS_USM_10K_40K_0US_V010.doc 66/88 Operating Manual
SG Series
10, 20, 30 & 40 kVA
7.4 PROCEDURES FOR PARALLEL SYSTEM WITH COMMON BATTERY
ONLY FOR UPS WITH EXTERNAL BATTERY.
7.4.1 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. Connect the Battery to all Units by closing the external Battery Switch(es) or
Fuses.
3. Close Q1 (Pos. I) on all Units
.
• Rectifiers start automatically, blinking LED indicates Soft-start.
•
At the end of Rectifier Soft-start, the LED remains lit.
• When closing Q1 on the last Unit of the parallel system, the Bypass of all Units
connects to the Load.
• LED’s service check turn OFF.
First operated unit All other units of the system
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