Modifications reserved
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OPM_LPS_33E_60K_M12_2GB_V010.doc
Operating Manual
LP 33 Series 60-80-100-120 kVA / S2
8.2.2 Parallel UPS shutdown with load transfer on manual bypass Q2
The purpose of this procedure is to supply the
load
directly by
mains
through
manual bypass Q2
.
This procedure is normally performed when the
System Parallel
must be completely switched OFF for
maintenance or service purpose, performed by an authorised
Service Centre
.
The
synoptic diagram
, on all UPS units, must display the status
“
LOAD SUPPLIED BY INVERTER
”
.
1. Disconnect the inverter by pressing
“
Inverter OFF
”
( O ) key and hold until the LED Inverter (7)
turns OFF on all UPS units.
The output will be supplied by the mains through all
automatic
bypass
.
LEDs Alarm
are lit and the
LEDs Operation
are Off.
The
synoptic diagram
, on all UPS units, must display the status
“
LOAD SUPPLIED BY AUTOMATIC BYPASS
”
.
2. Close the manual bypass switch Q2 (Pos. I) on all UPS units.
Load
is now supplied from
mains
in parallel from
automatic bypass
and
manual bypass Q2
of all UPS units.
The
synoptic diagram
, on all UPS units, must display the status
“
LOAD SUPPLIED BY AUTOMATIC BYPASS AND MANUAL BYPASS
Q2
”
.
3. Open the output switch Q1 (Pos. 0) on all UPS units.
The
load
is now supplied only through the
manual bypass Q2
.
The
synoptic diagram
, on all UPS units, must display the status
“
LOAD SUPPLIED BY MANUAL BYPASS Q2
”
.
4. Press “Total Off” key on all UPS units.
5.
Remove the external battery fuses on each unit
.
In case of GE battery cabinet:
−
Open fully and remove the cover of fuse-holder by using correctly the handle;
−
Remove the fuses from their place, re-install and close fully the cover of fuse-holder.
The
acoustical alarm
is activated, press
“MUTE”
key to reset it.
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