Changing The Transformer Taps - HindlePower AT30 SERIES Operating And Service Instructions

INSTALLING THE AT30

1.6. CHANGING THE TRANSFORMER TAPS

AT30s are normally designed for a single ac input supply voltage. Verify
the ac voltage listed on the data nameplate decal, and the ..CAUTION..
tag attached to the ac input circuit breaker (CB1). The AT30 ac input
transformer (T1) is designed with a voltage tolerance of +10% to -12%.
If your particular site ac supply voltage does not match your AT30
ac input requirements, you may need to change the ac input circuit
breaker (and/or fuses) and the input surge suppressors.
addition, you must replace (or rewire) the ac input power isolation
transformer (T1) as described below.
Failure to use properly rated components may damage the AT30.
If your AT10.1 was supplied with the 480 Vac 60Hz ac input feature, the
transformer will only accept the listed voltage.
Do not attempt to rewire the 480Vac transformer. If a different ac
input voltage feature for the AT30 is desired, please contact your sales
representative for ordering replacement parts (T1, CB1, VR2-VR5).
If your AT30 was supplied with one of the following ac input voltage
features, the transformer is re-tappable:
• 208 or 240Vac 60Hz
• 220 or 240Vac 50/60Hz
• 380 or 416Vac 50/60Hz
• 550 or 600Vac 50/60Hz
Before you connect ac power to the AT30, inspect the primary wiring of
the ac input transformer (T1). Make sure it is "tapped" for the desired ac
input supply voltage.
Before starting work, disconnect and lock out all external ac and
dc power sources to the AT30. Merely turning off (opening) the
front panel ac and dc circuit breakers (CB1/CB2) is not sufficient
to eliminate live voltages inside the enclosure. Verify that no
voltages are present inside the AT30, using 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.
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