IB140036EN
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Instruction Booklet
Effective: October 2014
Page
19
O&M Manual for 40-1200A (480/600 Vac) ATC-900 3-Position,
Open/Closed Transition Contactor Based Transfer Switch
4.7 Voltage Selection Adjustments
Certain devices, such as the Voltage Selection Panel, sensing
relays, and timers, need to be set and/or calibrated prior to plac-
ing the ATS equipment in service. Adjustments for logic devices
are described in the separate instructional document dedicated to
the specific logic being used. Voltage selection adjustments are
described in this section.
CAUTION
BE SURE THAT THE CORRECT VOLTAGE IS SELECTED TO MATCH
THE SYSTEM VOLTAGE. AN IMPROPER SELECTION AND/OR CON-
NECTION COULD RESULT IN EQUIPMENT DAMAGE.
4.7.1 North American Market
Voltage Selection
Panels (120,
208, 240, 480, 600 V, - 60 Hz)
The North American market voltage selection panel consists of
multi-tap transformers, contained in a steel case mounted in the
transfer switch enclosure (Figure 14). The cover has two connec-
tors on it, with the one on the right being selectable depending
on the voltage applied to S1 and S2. The transformer unit is eas-
ily removed by removing the two front screws and disconnecting
the two plugs. The rear of the transformer enclosure has two
flanges that are inserted into two slots. The voltage is selected
by simply removing the plug from the default selected voltage on
the cover plate and installing the plug to the desired available
voltage. Plugs are provided for 120 to 600 Vac to satisfy any
required North American market application voltage. The factory
default position is 480 Vac or 600 Vac. There is a similar selec-
tion panel for international voltages.
DANGER
WHEN CHANGING THE VOLTAGE SELECTION, THE POWER MUST BE
REMOVED FROM THE TRANSFER SWITCH. ALWAYS VERIFY THAT
NO VOLTAGE IS PRESENT ON EQUIPMENT PRIOR TO SERVICING.
FAILURE TO FOLLOW THIS WARNING COULD LEAD TO DEATH OR
SEVERE INJURY. WHILE ENERGIZED, AN ARC FLASH AND SHOCK
HAZARD EXISTS. CONSULT NFPA 70E AND OSHA GUIDELINES FOR
OPERATOR SAFETY PRIOR TO SERVICING, INSPECTING OR OPERAT-
ING EQUIPMENT.
Figure 14. North American Market Voltage Selection Terminals
(Shown Connected to the 208 Vac Plug).
