IB01602008E For more information visit: www.eaton.com
Instructional Booklet
Effective: March 2014 Page 13
ATC-300 Breaker Based Transfer Switch
3.5 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.
3.5.1 Standard Features
The following is a list of the standard features for the ATC-300
Controlled ATS.
1. Time Delay Normal to Emergency (TDNE)
This feature provides a time delay when transferring from the
Source 1 to the Source 2 power source. Timing begins
when Source 2 becomes available. It permits controlled
transfer of the load circuit to Source 2.
Adjustable 0 - 1800 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 Source 1.
Adjustable 0 - 120 Seconds
3. Time Delay Emergency to Normal (TDEN)
This feature provides a time delay of the re-transfer opera-
tion to permit stabilization of Source 1. Timing begins when
Source 1 becomes available. If Source 2 fails during timing,
then re-transfer is immediate overriding the time delay.
Adjustable 0 - 1800 Seconds
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.
Adjustable 0 - 1800 Seconds
5, Source 2 Monitoring and Protection
This feature provides monitoring and protection based on the
Source 2 voltage and/or frequency setpoints. All feature 5
functions are “failsafe” operations.
5B. 1-Phase Undervoltage and Underfrequency Protection
Adjustable Undervoltage:
Dropout: 50 - 97% of nominal
Pickup: (Dropout +2%) to 99% of nominal
Adjustable Underfrequency:
Dropout: 90 - 97% of nominal
Pickup: (Dropout +1Hz) to 99% of nominal
5C. 1-Phase Overvoltage/Overfrequency
Adjustable Overvoltage:
Dropout: 105 - 120% of nominal
Pickup: 103% to (Dropout –2%) of nominal
Adjustable Overfrequency:
Dropout: 103 - 110% of nominal
Pickup:101% to (Dropout -1Hz) of nominal
5D. 1-Phase Undervoltage
Adjustable Undervoltage:
Dropout: 50 - 97% of nominal
Pickup: (Dropout +2%) to 99% of nominal
5E. 1-Phase Overvoltage
Adjustable Overvoltage:
Dropout: 105 - 120% of nominal
Pickup: 103% of to (Dropout –2%) of nominal
5F. 3-Phase Undervoltage
Adjustable Undervoltage:
Dropout: 50 - 97% of nominal
Pickup: (Dropout +2%) to 99% of nominal
5G. 3-Phase Overvoltage
Adjustable Overvoltage:
Dropout: 105 - 120% of nominal
Pickup: 103% to (Dropout –2%) of nominal
5H. Phase Reversal
For a 3-phase wye source, this feature monitors the phase
sequence of the sources. If a source does not have the same
ABC or CBA sequence as the setpoint value, that source will
be considered “Unavailable.
For a 3-phase delta source, this feature should be turned off
via the PHASE REV setpoint.
5J. 3-Phase Undervoltage and Underfrequency Protection
Adjustable Undervoltage:
Dropout: 50 - 97% of nominal
Pickup: (Dropout +2%) to 99% of nominal
Adjustable Underfrequency:
Dropout : 90 - 97% of nominal
Pickup: (Dropout +1Hz) to 99% of nominal
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