IB01602017E
For more information visit: www.eaton.com
Instructional Booklet
Effective: July 2010
Page
7
ATC-100 Contactor Based Transfer Switch
Figure 5. Typical Power Panel for 400 A Model.
3.3 ATC-100 Logic Panel
The ATC-100 is a microprocessor-based transfer switch logic con-
trol package. The hardware and software of the controller contain
the intelligence/supervisory circuits that constantly monitor the
condition of the power sources. It provides the intelligence neces-
sary for the operation of the ATS (Figure 6).
Figure 6. ATC-100 Logic Control Panel.
The ATC-100 controller has an operating temperature of
-20 to 70°C (-4 to 158°F).
The controller circuit board is protected by an insulating conformal
coating.
The specifications, under normal operating conditions, are as fol-
lows:
•
Tolerance for voltage sensing function: ±1% of setting
•
Tolerance for frequency sensing function: ±0.3 Hz of setting
3.4 Features
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.
3.4.1 Standard Features
The following is a list of the standard features for the ATC-100
Controlled ATS.
1.
Time Delay Normal to Emergency (TDNE)
This feature provides a time delay when transferring from the
Utility to the Generator power source. Timing begins when
the Generator becomes available. It permits controlled trans-
fer of the load circuit to the Generator.
Jumper selectable at 2 seconds or 15 seconds.
2.
Time Delay on Engine Starting (TDES)
This feature provides a time delay of the signal to initiate the
engine/generator start cycle in order to override momentary
power outages or voltage fluctuations of Utility.
Fixed at 3 Seconds.
3. Time Delay Emergency to Normal (TDEN)
This feature provides a time delay of the re-transfer operation
to permit stabilization of Utility. Timing begins when the
Utility becomes available. If the Generator fails during tim-
ing, then re-transfer is immediate overriding the time delay.
Fixed at 5 Minutes.
4.
Time Delay for Engine Cool-down (TDEC)
This feature provides a time delay of the signal to initiate the
engine/generator stop cycle after the re-transfer operation.
This allows the engine/generator to cool down by running
unloaded. Timing begins on completion of the re-transfer
cycle.
Fixed at 1 Minute
5.
Generator Monitoring and Protection
This feature provides monitoring and protection based on the
Generator voltage and/or frequency setpoints. All feature 5
functions are Failsafe operations.
5J. All Phase Undervoltage and Underfrequency Protection
Undervoltage:
Dropout: 80% of nominal
Pickup: 90% of nominal
Underfrequency:
Dropout: 90% of nominal
Pickup: 95% of nominal
5N.
All Phase Overfrequency
Overfrequency:
Dropout: 115% of nominal
Pickup: 110% of nominal
