6.4.7 UPS and Critical Load
Shutdown
To
perform maintenance
or
service
on the critical load, shut down
power
to the
load:
1. Turn off all
equipment
that is being
powered
by the UPS parallel
sy
stem.
2. Transfer the UPSs to
bypass
by
performing
the
procedure
in
paragraph
6.4.3.
3.
Perform
the LOAD OFF
procedure
in
paragraph
6.4.10.
The
output
and
bypass backfeed contactors open,
and the
power module
is
turned
of
f
.
4.
Perform
the
battery charger
off
procedure
in
paragraph
6.4.8 for each
UPS
.
The input and
battery
relay
open.
W
ARNING
Power
is
present
inside the UPS
cabinets
after the
upstream
input
feeder
circuit
breakers are
opened because
of the installed
external battery cabinet.
5. Open all input
switc
hes.
6. Open all of the
maintenance bypass switc
hes.
7. O p e n t h e
output switc
h.
8. Open all of the
MOBs.
9. Open all of the UPSs input and
bypass feeder
circuit
break
ers.
10.Open all
external battery break
ers
6.4.8
Charger
Control
To turn an individual UPS
battery charger on:
1.
Select
the CONTROLS symbol on the main
menu
bar on the UPS requiring the
charger
to be
turned
on.
T
he
System
Control
screen
is
displa
y
ed.
2.
Select
Battery on the
System
Control
screen
3. On the Battery
System
Control
screen, select
the RESTING
CHARGING
command,
then
press the
RETURN
pushbut
ton.
To turn an individual UPS
battery charger
of
f:
1.
Select
the CONTROLS symbol on the main
menu
bar on the UPS requiring the
charger
to be
turned
off.
T
he
System
Control
screen
is
displa
y
ed.
2.
Select
Battery on the
System
Control
screen.
3. On the Battery
System
Control
screen, select
the CHARGING RESTING
command,
then
press the
RETURN
pushbut
ton.
Eaton 93E MK2 UPS (10-40kVA, 380/400/415V) Installation and Operation
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