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INSTALLING THE AT10.1
10
1.6. CHANGING TRANSFORMER TAPS
Before you wire ac power to the AT10.1, check the wiring of the main
transformer T1, to be sure it is connected for your ac input voltage. The
AT10.1 accepts standard input voltages of 120, 208 or 240 Vac by
changing jumpers on T1. No other changes are required. The AT10.1 is
wired at the factory for 240 Vac, except on special order. Models for 220,
380 or 416 Vac at 50/60 Hz are available on special order.
EXCEPTION: An AT10.1 battery charger rated for 480 Vac input uses a
special transformer that has no taps or jumpers. The 480 Vac
transformer cannot be used for any other input voltage.
Before changing the T1 taps, be sure that ac and dc supplies to the AT10.1
are turned off and locked out. Verify that no voltage is present by using a
voltmeter at terminals TB1-L1 and TB1-L2 (ac), TB1(+) and TB1(-) (dc)
and remote sense terminals (dc). Note that turning off the ac and dc circuit
breakers on the AT10.1 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. See section 3.5 for necessary steps to follow when accessing internal
components within the AT10.1. Change the jumpers on T1 as shown in
the table on the next page. All transformers have (2) jumpers; always use
both as specified in the table. The transformers used in the small enclosure
(586) use piggyback quick-connect terminals. The transformers in the
larger enclosure (594) use 10-32 stud terminals.
Models designed for 220 Vac, 50/60 Hz have no jumpers, and can be used
only for that voltage. Models designed for 380 or 416 Vac also have no
jumpers, and can be operated on either voltage.
NOTE: This procedure refers only to Group I AT10.1 battery chargers
(rated 6-25 Adc). A different procedure exists for Group II AT10.1
battery chargers (rated 30-100 Adc). Please refer to the Operating and
Service Instructions specific to the Group II AT10.1 battery charger for
changing the transformer taps on these larger units. Otherwise, damage
to your charger and equipment may occur.