IB01602009E For more information visit: www.eatonelectrical.com
Instruction Booklet
Effective: April 2004 Page 7
ATC-300 Automatic
Transfer Switch
Controller
26. Source 1 - Monitoring and Protection
This feature provides Source 1 monitoring and protec-
tion functions. If the Source 1 power supply fails, then
the ATC will begin the sequence of operations neces-
sary to transfer the load circuit to the Source 2 power
supply. All Feature 26 monitoring and protection func-
tions are “failsafe” operations.
26C. All Phase Overvoltage Protection
Provides all phase overvoltage monitoring and protec-
tion.
Adjustable Overvoltage:
Dropout: 105-120% of nominal
Pickup: (Dropout -2%) to 103% of nominal
26E. All Phase Underfrequency Protection
Provides all phase underfrequency monitoring and pro-
tection.
Adjustable Underfrequency:
Dropout: 90-97% of nominal
Pickup: (Dropout +1Hz) to 99% of nominal
26F. All Phase Overfrequency Protection
Provides all phase overfrequency monitoring and pro-
tection.
Adjustable Overfrequency:
Dropout: 103-110% of nominal
Pickup: (Dropout -1Hz) to 101% of nominal
26H. Phase Reversal Protection
For a 3-phase source, this feature monitors the phase
sequence of the sources. If a source does not have the
same ABC or CBA sequence as the phase reversal set-
point, the source will be considered “Unavailable”.
26L. Source 1 3-Phase Voltage Unbalance/Loss
For a 3-phase source, this feature monitors phase volt-
age ratios. Voltage unbalance (%) is calculated as the
difference between the maximum and minimum phase
voltage, divided by the minimum phase voltage. User-
selectable setpoints are available for dropout and
pickup unbalance settings (minimum 2% differential).
Dropout is adjustable from 5 to 20%. Pickup is adjust-
able from 3 to (Dropout –2%)). A setpoint for user-
selectable time delay from 10 to 30 seconds is pro-
vided. The factory default setpoints are: 5% dropout,
3% pickup, and 30 seconds time delay. A user-select-
able setpoint for enable and disable is also provided.
When an unbalance condition is detected on Source 1,
the Unbalance Timer (TD UNBAL) starts timing. After
TD UNBAL times out, Source 1 is declared “failed”.
SECTION 2: HARDWARE DESCRIPTION
2.1 General
The purpose of this section is to familiarize the reader with
the ATC-300 Controller hardware, its nomenclature, and to
list the unit’s specifications. The information presented is
divided into the following three parts:
■ Operator Panel;
■ Rear Access Area; and
■ Specification Summary.
2.2 Front (Operator) Panel
The front panel, depending on the installation, is normally
accessible from the outside of a panel or door. The front
panel provides a means to:
■ Alert the user to specific conditions;
■ Program the controller; and
■ Set and monitor the operating parameters.
The ATC-300 Controller front panel serves two primary func-
tions: output and input. The output function consists of:
■ A two-line, 16 character LCD display module
■ Five LED outputs
1 Unit Status
2 Source 1 Available
3 Source 1 Connected
4 Source 2 Available
5 Source 2 Connected
There are seven input functions accessible through the push-
buttons:
1 Help/Lamp Test
2 Engine Test
3 Step/Enter
4 Increase
5 Decrease
6 Alarm Reset
7 Bypass Time Delay
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