Exide Technologies Section 94.40 - Manual (Page 14)

INSTALLING THE AT30
10
1.6. CHANGING THE TRANSFORMER TAPS
IMPORTANT: AT30 battery chargers are designed for a single ac
input supply voltage. Note the ac voltage listing on the data
nameplate, and tag attached to the ac circuit breaker.
If your particular site ac supply voltage does not match your AT30
ac input requirements, you MUST change the ac input circuit
breaker (and/or fuses), and input surge suppressors. In addition,
you must replace or rewire the transformer as described below.
Failure to use properly rated components may damage the AT30.
NOTE: If your AT30 battery charger was supplied with 480Vac-60Hz
input, or 220Vac-50/60Hz input, the transformer will only accept the
listed voltage. Do not attempt to rewire these transformers. If a
different ac input voltage is desired for the AT30, please contact your
sales representative for ordering replacement parts.
Before you connect ac power to the AT30, check the wiring of the main
transformer (T1), to be sure it is connected for the desired ac input
voltage. The main transformer was wired at the factory for the input
voltage specified and listed on the data nameplate.
If your AT30 was supplied with 208/240 Vac - 60 Hz input, and you need
to change the factory-wired input voltage, you do so by changing jumpers
on the main transformer (T1).
If your AT30 was ordered with 380/416 Vac - 50/60 Hz, and you need to
change the factory-wired ac input voltage, consult the factory for special
instructions.
NOTE: Before starting work, disconnect and lock out all external ac
and dc power sources to the AT30. Note that just turning off the front
panel ac and dc circuit breakers is not sufficient to eliminate live
voltages inside the enclosure. Use a voltmeter at the ac terminals
TB1-L1, TB1-L2 & TB1-L3, the dc terminals TB1(+) & TB1(-), the dc
remote sense terminals, and any external wiring to alarm relay
contacts, to verify that no voltage is present inside the enclosure.