4
Changing Transformer Taps Procedure
NOTE: This procedure refers
only
to ITSM Isolation Transformers that accept multiple input or multiple output
voltages. Single input and output Isolation Transformers do not include taps.
Before wiring AC power, check the taps, to be sure the Isolation Transformer is set for the correct AC input and
output voltage. Before changing the taps, be sure that AC supply is turned off and locked out. Verify that no
voltage is present by using a voltmeter at all input and output terminals.
Change the connections to the input and output terminals for transformers with 120/240/208 VAC input and
120/240/208 VAC output as shown:
120 VAC Input Voltage
a. Connect jumper
JP1
from pin
1
to pin
3
of
TB1
terminal
b. Connect jumper
JP2
from pin
2
to pin
5
of
TB1
terminal
c. Connect power line
L1
to pin
1
of
TB1
terminal
d. Connect power line
L2
(Neutral) to pin
5
of
TB1
terminal
208 VAC Input Voltage
a. Connect jumper
JP1
from pin
2
to pin
3
of
TB1
terminal
b. Connect jumper
JP2
from pin
2
to pin
3
of
TB1
terminal
c. Connect power line
L1
to pin
1
of
TB1
terminal
d. Connect power line
L2
to pin
4
of
TB1
terminal
240 VAC Input Voltage
a. Connect jumper
JP1
from pin
2
to pin
3
of
TB1
terminal
b. Connect jumper
JP2
from pin
2
to pin
3
of
TB1
terminal
c. Connect power line
L1
to pin
1
of
TB1
terminal
d. Connect power line
L2
to pin
5
of
TB1
terminal
120 VAC Output Voltage
a. Connect jumper
JP3
from pin
X1
to pin
X3
of
TB2
terminal
b. Connect jumper
JP4
from pin
X2
to pin
X5
of
TB2
terminal
c. Connect equipment line
L1
to pin
X1
of
TB2
terminal
d. Connect equipment line
L2
(Neutral) to pin
X5
of
TB2
terminal
208 VAC Output Voltage
a. Connect jumper
JP3
from pin
X2
to pin
X3
of
TB2
terminal
b. Connect jumper
JP4
from pin
X2
to pin
X3
of
TB2
terminal
c. Connect equipment line
L1
to pin
X1
of
TB2
terminal
d. Connect equipment line
L2
to pin
X4
of
TB2
terminal
240 VAC Output Voltage
a. Connect jumper
JP3
from pin
X2
to pin
X3
of
TB2
terminal
b. Connect jumper
JP4
from pin
X2
to pin
X3
of
TB2
terminal
c. Connect equipment line
L1
to pin
X1
of
TB2
terminal
d. Connect equipment line
L2
to pin
X5
of
TB2
terminal
