From Manual Bypass Q2 (Option) To Normal Function Vfi - GE SG 225 User Manual

7.1.3 From Manual Bypass Q2 (option) to normal function VFI

NOTE !
UPS system has been turned OFF following the "Maintenance shutdown (Load on
Manual Bypass Q2)" procedure and the Load is still powered by Manual Bypass Q2
(option).
The Load must be transferred back to the UPS system.
Open the front door and make sure that:
The safety screens are fixed in their position.
•
The UPS Output Switch Q1 and the External Battery Switch or Fuses are open (Pos. O).
•
The Manual Bypass Switch Q2 (option) is closed (Pos. I).
•
LED Alarm is lit.
•
Initial status:
Load supplied from Manual Bypass Q2 (option).
1. If not already supplied (separate Utility Inputs), switch-ON the Utility power to the Rectifier
input.
2. Close the UPS Output Switch Q1 (Pos. I).
•
Load is now supplied parallel through Automatic Bypass and Manual Bypass Q2.
LED 8 (Automatic Bypass ON) and LED 9 (Manual Bypass Q2 ON) are lit.
•
Rectifier starts automatically, blinking LED 3 (Rectifier ON) indicates Soft-start.
•
At the end of Rectifier Soft-start the LED 3 (Rectifier ON) remains lit.
The Synoptic Diagram must display the status "LOAD
SUPPLIED BY AUTOMATIC BYPASS AND MANUAL BYPASS
Q2".
3. Connect the Battery to the UPS by closing (Pos. I) the External Battery Switch or Fuses.
LED 4b (Charging Battery) should be lit indicating battery charge.
ATTENTION !
Before performing this operation, the LED 3 (Rectifier ON) must remain lit, thus
indicating that the DC-Link has reached floating voltage (540Vdc)!
Modifications reserved
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User Manual SG Series 225 & 300 UL S2