Modifications reserved Page 63/79
OPM_SGS_USM_M22_M30_2US_V010.doc User Manual SG Series 225 & 300 UL S2
7.2.3 From Manual Bypass Q2 (option) to normal function VFI
NOTE !
UPS Parallel System has been turned OFF following the “Maintenance shutdown
(Load on Manual Bypass Q2)” procedure and the Load is still powered by all Manual
Bypass Q2 (option).
The Load must be transferred back to the UPS Parallel System.
Open the front door on all UPS units and make sure that:
• The safety screens are fixed in their position.
• The UPS Output Switches Q1 and the External Battery Switch or Fuses are open (Pos. O).
• The Manual Bypass Switches Q2 (option) are closed (Pos. I).
• LED Alarm are lit.
Initial status:
Load supplied from all Manual Bypass Q2 of the Parallel
System.
All Manual Bypass Switches Q2 of the Parallel System
are closed.
1. If not already supplied (separate utility inputs), switch-ON the utility power to the rectifier
input on all UPS units.
2. Close the UPS output switch Q1 (Pos. I) on first Unit.
•
Rectifier starts automatically, blinking LED 3 (Rectifier ON) indicates Soft-start.
• At the end of Rectifier Soft-start, LED 3 (Rectifier ON) remains lit.
Synoptic diagram of first unit Synoptic diagram of other units
3. Connect the Battery on first Unit by closing (Pos. I) its 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)!
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