Modifications reserved
Page 49/79
OPM_SGS_USM_M40_M50_2US_V010.doc
User Manual
SG Series 400 & 500 UL S2
7.1.2 UPS shutdown with Load transfer on Manual Bypass Q2 (option)
NOTE !
Not following this procedure can cause protected loads to shut down!
Never close or open either
UPS Output Switch Q1
and
Manual Bypass switch Q2
(option) with the
Inverter
running!
Initial situation: the
Load
is powered by the
Inverter
.
If
eBoost™
option is available, make sure that
eBoost™ Operation Mode
is
disabled before starting this procedure.
The complete UPS system has to be turned OFF, while providing the
Load
power
by
Utility
through the
Manual Bypass Q2
(option).
With the UPS in normal operation and the
inverter
supplying the
Load
, the
UPS Output Switch Q1
is
closed (Pos. I)
and the
Manual Bypass Switch Q2 (option)
is open (Pos. O)
.
The
External
Battery Switch or Fuses
are closed (Pos. I)
.
The
Synoptic Diagram
must display the status
“
LOAD
SUPPLIED BY INVERTER
”
.
1. Disconnect the Inverter by pressing the
“
Inverter OFF
”
( O ) key and hold until the LED 5
(Inverter available) turns OFF.
•
Load
is transferred to
Utility
by
Automatic Bypass
.
•
Inverter
shuts down.
LED 5 (Inverter available)
must be OFF.
•
LED Alarm
is lit and the
LED Operation
is Off.
The
Synoptic Diagram
must display the status
“
LOAD
SUPPLIED BY AUTOMATIC BYPASS
”
.
2. Close the Manual Bypass Switch Q2 (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.
The
Synoptic Diagram
must display the status
“
LOAD
SUPPLIED BY AUTOMATIC BYPASS AND MANUAL BYPASS
Q2
”
.
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