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IM05805022K
Instruction Booklet
Page
4
Effective: January 2012
ATC-300+ Automatic
Transfer Switch Controller
1.5.2 Standard and Optional Features
A variety of programmable features are available with the ATC
300 Controller to meet a wide variety of application requirements.
Individual features or feature combinations provide the intelli-
gence required to tailor ATSs to individual needs.
The specific variable setpoints associated with standard and fac-
tory activated features are stored in nonvolatile memory. Acti-
vated feature setpoints are available for customer adjustment.
1.5.2.1 Standard Features
The following is a list of the standard features of the ATC-300+
Controller.
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 operation
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.
5H. Phase Reversal
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”.
5J. 3-Phase Undervoltage and Underfrequency Protection
Adjustable Undervoltage:
Dropout (Breaker Style): 50 - 97% of nominal
Dropout (Contactor Style): 78 - 97% of nominal
Pickup: (D2%) - 99% of nominal
Adjustable Underfrequency:
Dropout (Breaker Style): 90 - 97% of nominal
Dropout (Contactor Style): 90 - 97% of nominal
Pickup: (D1Hz) - 99% of nominal
5K. 3-Phase Overvoltage/Overfrequency
Adjustable Overvoltage:
Dropout (Breaker Style): 105 - 120% of nominal
Dropout (Contactor Style): 105 - 110% of nominal
Pickup: 103% - (Dropout -2%) of nominal
Adjustable Overfrequency:
Dropout (Breaker Style): 103 - 110% of nominal
Dropout (Contactor Style): 103 - 105% of nominal
Pickup: 101% - (Dropout -1Hz) of nominal
5L. 3-Phase Voltage Unbalance
This feature monitors phase voltage ratios. Voltage unbal-
ance (%) is calculated as the difference between the maxi-
mum and minimum phase voltage, divided by the minimum
phase voltage. User-selectable setpoints are available for
dropout and pickup unbalance settings (minimum 2% differ-
ential). Dropout is adjustable from 5 to 20%. Pickup is
adjustable from 3 to (Dropout –2%). A setpoint for user-
selectable time delay from 10 to 30 seconds is provided.
The factory default setpoints are: 5% dropout, 3% pickup,
and 30 seconds time delay. A user-selectable setpoint for
enable and disable is also provided.
When an unbalance condition is detected on Source 2, the
Unbalance Timer (TD UNBAL) starts timing. After TD
UNBAL times out, Source 2 is declared “failed”.
