6
2.2 Changing
Transformer
Taps
NOTE: This procedure refers
only
to A75D(E) battery chargers that are
rated for 6 to 25 ADC
. A75D(E)
battery chargers that are
rated for 30 to 100 ADC
do not include transformer taps.
Before wiring AC power to the A75D(E), check the wiring of the power transformer PT, to be sure it is
connected for the correct AC input voltage. The A75D(E) 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 A75D(E) is wired at the factory for 240 VAC, except on special request..
Before changing the PT taps, be sure that AC supply and DC loads to the A75D(E) 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 A75D(E)
does NOT
eliminate live voltages inside the enclosure. Also 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 on the following page.
NOTE: An A75D(E) battery charger rated for 480 VAC or 600 VAC input uses a special transformer that has no
taps. The 480 VAC and 600 VAC transformers cannot be used for any other input voltage.
Changing Transformer Taps Procedure
Before beginning any work inside the charger enclosure ensure that all incoming AC supply and DC load wires
are de-energized. Verify that no voltage is present inside the case by using a voltmeter at all input and output
terminals.
For 120 VAC Input Voltage:
1.
Connect wire marked
A
to terminal
5
2.
Connect wire marked
B
to terminal
7
3.
Connect wire marked
C
to terminal
3
Note that
AC input 1
connects to terminal
1(L1)
Note that
AC input 2
connects to terminal
4(N)
For 208 VAC Input Voltage:
1.
Connect wire marked
A
to terminal
6
2.
Connect wire marked
B
to terminal
5
3.
Connect wire marked
C
to terminal
2
Note that
AC in 1
connects to terminal
1(L1)
Note that
AC in 2
connects to terminal
3(L2)
For 240 VAC Input Voltage:
1.
Connect wire marked
A
to terminal
7
2.
Connect wire marked
B
to terminal
5
3.
Connect wire marked
C
to terminal
2
Note that
AC in 1
connects to terminal
1(L1)
Note that
AC in 2
connects to terminal
3(L2)
ACin1 ACin2 A B C
INPUT
VAC
120
1 (L1)
4 (N)
5
7
3
208
1 (L1) 3 (L2)
6
5
2
240
1 (L1) 3 (L2)
7
5
2
Table 5 - Input Terminal Connections
Figure 6 - Input Terminals
Connection Schematic
