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

INSTALLING THE AT30

1.6. CHANGING THE TRANSFORMER TAPS

...! CAUTION...
the ac input voltage listed on the data nameplate decal, and the tag
attached to the ac breaker (CB1). The power isolation transformer (T1) is
designed with an ac input voltage tolerance of +10% to -12%.
If available on-site ac supply voltage does not match the AT30 input
requirements, you may need to replace certain ac components. See
Section 3.6 on page 62 for ordering replacement parts. Failure to use
properly rated components may damage the AT30.
If your AT30 was supplied with one of the following ac input voltage
features, the transformer (T1) is re-tappable:
• 208 or 240 Vac 60Hz
• 220 or 240 Vac 50/60Hz
• 380 or 416 Vac 50/60Hz
• 550 or 600 Vac 60Hz
If the AT30 was supplied with the 480 Vac 60Hz ac input feature, the
transformer will only accept the listed voltage. Do not attempt to re-tap
this transformer. If the transformer is not re-tappable, a full ac feature
change is needed. Contact your sales representative for ordering all
voltage and current-specific ac replacement parts (T1, CB1 & VR2-VR5).
. .! WARNING
the AT30. Lock out ac and dc power supplies. Merely turning off
(opening) the AT30 internal circuit breakers does not eliminate live
voltages inside the enclosure. Allow filter capacitors (C1/C2) to bleed
off. De-energize any external wiring to the AT30 alarm relay contacts
(TB3/TB4). Verify no internal voltages are present before proceeding.
AT30s are designed and manufactured from the factory to accept a single
ac input supply voltage. Transformer re-taps for 208/240, 220/240,
380/416, or 550/600 Vac do not require additional changes. For a more
detailed description of this procedure, or for ac voltage changes not listed,
refer to Service Instruction (JD5026-03).
AT30 isolation transformers featured bolted connections, protected with
heat shrink insulation, which may need to be removed.
NOTICE
Series battery chargers. Refer to similar procedures for single-phase
input AT10.1 Series chargers. See Section 1.6 in O&SI (JA0102-01) for
Group I models, or O&SI (JA0102-02) for Group II models. Otherwise,
damage to the AT30 and site equipment may occur.
10
Before connecting external power to the AT30, verify
.
Before changing the transformer (T1) taps, shut down
This procedure refers only to three-phase input AT30