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Instruction Booklet
Page 8 Effective: April 2004
ATC-300 Automatic
Transfer Switch
Controller
Figure 1. The ATC-300 Controller Front Panel.
2.2.1 The Output Function Components
The Display
A 2-line, 16-character alphanumeric LCD Display module is
used to display all ATC-300 Controller monitored parameters,
setpoints, and messages in easy to read formats. The display
has a green high contrast background that allows clear visibil-
ity of any information displayed. The display is continuously
lit for clear visibility under poorly lit or no light conditions.
Six different displays can be presented via the LCD Display:
■ Status Display
■ Source 1 Display
■ Source 2 Display
■ Time/Date Display
■ History Display
■ Setpoints Display
As a default when there are no active commands or timers
being displayed, the display cycles through the following
information at three-second intervals. This is referred to as
the “Home” screen.
1. Line 1: Date (ex.: 01/20/04)
Line 2: Military Time (ex.: 15:35:30 [= 3:35:30 PM])
2. Line 1: Source 1
Line 2: Actual metered values on Source 1 (ex.: 480 Vac
60 Hz)
3. Line 1: Source 2
Line 2: Actual metered values on Source 2 (ex.: 480 Vac
60 Hz)
See Section 3 for more detailed information.
The LEDs
Unit Status
The green Unit Status LED blinks at a rate of once per second
while in the ATC-300 Controller is in the “Run” Mode. This
indicates that the ATC-300 has completed a self-diagnostic
and system diagnostic cycle. The self-diagnostic cycle
checks include the:
■ Microprocessor operation and
■ Memory operation.
The system diagnostic cycle checks include the:
■ Output relay operation;
■ Control input operation; and
■ Transfer switch operation.
The Unit Status LED blinks at an increased rate while the
ATC-300 Controller is in the “Program” Mode.
Source 1 Available
The white Source 1 Available LED illuminates if the Source 1
power source meets the criteria to be considered “available”.
That is, when it is within its undervoltage/overvoltage/under-
frequency/overfrequency/voltage unbalance/phase reversal (if
applicable) setpoint ranges for the nominal voltage and fre-
quency setting.
Source 1 Connected
The green Source 1 Connected LED illuminates when the
Source 1 switching device and its associated position indicat-
ing auxiliary contact are closed.
Source 2 Available
The amber Source 2 Available LED illuminates if the Source 2
power source meets the criteria to be considered “available”.
That is, when it is within its undervoltage/overvoltage/under-
frequency/overfrequency/voltage unbalance/phase reversal (if
applicable) setpoint ranges for the nominal voltage and fre-
quency setting.
Source 2 Connected
The red Source 2 Connected LED illuminates when the
Source 2 switching device and its associated position indicat-
ing auxiliary contact are closed.
2.2.2 The Input Function Components
The Pushbuttons and Combinations
Help/Lamp Test Pushbutton
The Help/Lamp Test pushbutton serves two functions. If the
Help/Lamp Test pushbutton is pressed when a message is
present on the LCD Display, a detailed description of the mes-
sage will appear. The detailed message description will scroll
across the bottom of the display. The detailed description
can be aborted by pressing Help/Lamp Test key a second
time.
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