4
2.2
Changing Transformer Taps
–
Rectifier AC Input
NOTE:
This procedure refers
only
to AUPS systems that accept three input voltages of 120, 240, and 208 VAC
at the Rectifier AC Input [Voltage code: ABD].
Before wiring AC power to the AUPS, check the wiring of the power transformer PT, to be sure it is connected
for the correct AC input voltage. The AUPS accepts standard input voltages of 120, 208, or 240 VAC by
changing the connections to the input terminals. No other changes are required.
NOTE:
The AUPS is wired at the factory for 240 VAC, except on special request.
2.2.1 Changing Transformer Taps Procedure
–
Rectifier AC Input
Before changing the PT taps, be sure that all AC supplies and DC battery to the AUPS are turned off and locked
out. Verify that no voltage is present by using a voltmeter at all input and output terminals. Turning off the AC
and DC circuit breakers on the AUPS
does NOT
eliminate live voltages inside the enclosure. Additionally, de-
energize any external wiring to the alarm relay contacts.
Verify that all voltages within the enclosure are de-energized and locked out. Change the connections to the
input terminals as shown in the table and figure below.
For 120 VAC Input Voltage:
1.
Connect jumper across
TS-3
terminals
#1
&
#2
2.
Connect jumper across
TS-4
terminals
D
&
#3
3.
Connect jumper across
TS-4
terminals
E
&
#1
Note that
AC input 1
connects to terminal
L1
Note that
AC input 2
connects to terminal
L3
For 208 VAC Input Voltage:
1.
Connect jumper across
TS-3
terminals
#2
&
#3
2.
Connect jumper across
TS-4
terminals
D
&
#2
3.
Connect jumper across
TS-4
terminals
E
&
#3
Note that
AC input 1
connects to terminal
L1
Note that
AC input 2
connects to terminal
L2
For 240 VAC Input Voltage:
1.
Connect jumper across
TS-3
terminals
#2
&
#3
2.
Connect jumper across
TS-4
terminals
D
&
#1
3.
Connect jumper across
TS-4
terminals
E
&
#3
Note that
AC input 1
connects to terminal
L1
Note that
AC input 2
connects to terminal
L2
VAC
Input
TB1
Use
TS-3
Jumper
Connection
TS-4
D E
120
L1-L3
1-2
3
1
208
L1-L2
2-3
2
3
240
1
3
Table 3
–
Input Terminal Connections
Figure 2
–
Input Terminals Connection
Schematic (240VAC Input Shown)
Summary of Contents for 7.5K-A1-BD3-125V100A
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