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.
IB140036EN
For more information visit: www.eaton.com
Instruction Booklet
Effective: October 2014
Page
9
O&M Manual for 40-1200A (480/600 Vac) ATC-900 3-Position,
Open/Closed Transition Contactor Based Transfer Switch
Figure 7.North American Market Voltage Selection Terminals
(Shown Connected to the 208 Vac Plug).
3.4 ATC-900 Logic Panel
The ATC-900 is a microprocessor-based transfer switch logic
control package. The hardware and software of the controller
contain the intelligence/supervisory circuits that constantly moni-
tor the condition of the power sources. It provides the intelli-
gence necessary for the operation of the ATS (Figure 8). It has
user friendly menus and a color TFT display for easy verification
and feature user settings.
Figure 8. ATC-900 Logic Control Panel.
The ATC-900 controller has an operating temperature of
-20 to 70°C (-4 to 158°F).
The controller circuit board is protected by an insulating confor-
mal coating.
The specifications, under normal operating conditions, are as fol-
lows:
■
Tolerance for voltage sensing function: ±1% of full scale.
■
Tolerance for frequency sensing function: ±0.3 Hz of setting.
Please see the ATC-900 controller's Instruction Booklet for new
features and instructions.
3.5 Features and Glossary of Terms
A variety of standard and optional features are available for Eaton
ATSs.
All features or combinations of features may not be avail-
able on specific ATSs
. All features and/or accessories are Under-
writers Laboratories (UL) listed unless noted.
3.5.1 Operational Simplicity
From installation, to programming, to usage, the ATC-900 was
designed with operational simplicity in mind. Only one style
needs to be considered, regardless of input/output requirements
or system voltages and frequencies. ATC-900 provides the func-
tionality of numerous other devices combined in one package
that mounts in less than 7 by 11 inches of panel space.
The user friendly front panel interface simplifies routine opera-
tion, programming, data presentation and setting adjustments. A
large color display provides flexibility and ease of use. The opera-
tion of front panel membrane pushbuttons moves the ATC-900
display from function to function or step to step within menus. A
