Modifications reserved Page 50/79
OPM_SGS_USM_M22_M30_2US_V010.doc User Manual SG Series 225 & 300 UL S2
3. Open the UPS Output Switch Q1 (Pos. O) and then press the “Load Off” button.
•
The load is now supplied only through the Manual Bypass Q2.
• Rectifier shuts down and all output and input Contactors are opened.
• Press the “MUTE” key to reset the alarm buzzer.
The Synoptic Diagram must display the status “LOAD
SUPPLIED BY MANUAL BYPASS Q2”.
4. Disconnect the Battery from the UPS by opening (Pos. O) the External Battery Switch or Fuses.
•
Wait 5 minutes for DC-Link Capacitors discharge.
The Load is now powered from the Utility through Manual Bypass Q2 (option).
END OF PROCEDURE
WARNING!
It will take a minimum of 5 minutes for the DC capacitors to discharge.
Open only the front door, do not open any other part of the UPS.
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