Modifications reserved
Page 62/79
OPM_SGS_USM_M40_M50_2US_V010.doc
User Manual
SG Series 400 & 500 UL S2
3. Open the UPS Output Switch Q1 (Pos. O) and then press the
“
Load Off
”
key on all Units.
•
The
Load
is now supplied only through the
Manual Bypass Q2
of all
Units
.
•
LED 8 (Automatic Bypass ON)
turns OFF and
LED 9
(Manual Bypass Q2 ON)
stays lit.
•
All
Rectifiers
are shutdown and all output and input
Contactors
are opened.
The
Synoptic Diagram
, on all UPS units, must display the status
“
LOAD SUPPLIED BY MANUAL BYPASS Q2
”
.
Synoptic Diagram of first unit
Synoptic Diagram of other units
4. Disconnect the Battery from on all Units 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 all
Manual Bypass Q2 (option) of the Parallel
System
.
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.