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O & M Manual for the RLC1
Automatic Transfer Switch
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 7).
Figure 7. 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 full scale
• Tolerance for frequency sensing function: ±0.3 Hz of setting
3.4 RLC1 ATS 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.
IB01602016E
2.
3.
4.
5.
5J. All Phase Undervoltage and Underfrequency Protection
5N.
6.
6B. Test Pushbutton
For more information visit: www.eaton.com
Instructional Booklet
Effective: March 2014
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.
Time Delay Emergency to Normal (TDEN)
This feature provides a time delay of the re-transfer opera-
tion 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.
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 5 Minutes
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.
Undervoltage:
Dropout: 80% of nominal
Pickup: 90% of nominal
Underfrequency:
Dropout: 90% of nominal
Pickup: 95% of nominal
All Phase Overfrequency
Overfrequency:
Dropout: 115% of nominal
Pickup: 110% of nominal
Test Operators
Eaton ATSs are provided with a Test Pushbutton that simu-
lates a loss of the Utility power source as standard (Feature
6B). All programmed time delays (TDNE, TDEN, etc.) will be
performed as part of the Test. Engine run time of the Test is
equal to the Generator Test (Feature 23) programmed set-
point. All Tests are Failsafe protected.
Programmable setpoints include:
1. Load or No Load Testing, or Off
2. Engine run time equal to the Generator Test
(Feature 23) setting
Page 7
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