APC Smart-UPS VT User Manual
Page 24
Operation – Operation Procedures
18
Smart-UPS® VT 10-40 kVA 400V, 208V, 200V – Operation
990-2282A-001
Total power off – isolating one UPS in a parallel system.
Parallel system – turning the isolated UPS into normal operation.
From the UPS: From the Main Menu screen
select Status and scroll down to Status of
actual redundancy: n+ in order to check that
the remaining UPS(s) will be able to carry the
load when one UPS is isolated.
From the UPS: Turn load
OFF
from the display
on the UPS to be isolated via Control–Turn
Load off–Yes, turn Load off.
From the external MBP: Check that the output
lamp
(Q002)
of the UPS to be isolated is lit.
From the external MBP: Turn the output
switch
(Q002)
connected to the UPS you want
to isolate to position “0”
(OFF).
From the external MBP: Turn the input switch
(Q001)
connected to the UPS you want to
isolate to position “0”
(OFF)
.
From the XR Enclosure(s) (if available): Set
the DC disconnect switch (if available) on the
XR Enclosure to the
OFF
position.
From the UPS: Disconnect the batteries in the
UPS which you want to isolate by pulling them
out to the red disconnect line.
From the XR Enclosure(s) (if available):
Disconnect the batteries by pulling them out to
the red disconnect line.
From the external MBP: Turn the input switch
(
Q1)
connected to the UPS you want to turn
into normal operation to position “1”
(ON)
.
From the UPS: Connect the batteries by
pulling them in.
From the XR Enclosure(s) (if available):
Connect the batteries by pulling them in.
From the XR Enclosure(s) (if available): Set
the DC disconnect switch (if available) on the
XR Enclosure to position
ON
.
From the external MBP: Turn the output
switch
(Q002)
connected to the UPS you want
to turn into normal operation to position “I”
(ON).
From the UPS: Turn load
ON
from the display
on the UPS you want to turn into normal
operation via Control–Turn Load on–Yes,
turn Load on.
From the UPS: Press
E
SC
two times to get back
to the Overview Screen.
From the UPS: On the Overview Screen, check
that the load percentage of the UPS units is
approximately the same.