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Instruction Booklet
Effective: April 2004 Page 5
ATC-300 Automatic
Transfer Switch
Controller
12C. Source 1 - Source Connected
This feature provides a green LED that, when lit, indi-
cates the load is connected to Source 1.
12D. Source 2 - Source Connected
This feature provides a red LED that, when lit, indi-
cates the load is connected to Source 2.
Power Source Availability
Provides LEDs to indicate if a power source is avail-
able. LEDs may be integral or separate from the con-
troller.
12G. Source 1 - Available
This feature provides a white LED that, when lit, indi-
cates Source 1 is available.
12H. Source 2 - Available
This feature provides an amber LED that, when lit, indi-
cates Source 2 is available.
15. Switch Position Indication Contact
This feature provides a contact that indicates if the
power-switching device is in the “Open” or “Closed”
position.
15E. Source 1 Position Indication Contact
This feature provides 1 Dry Form “C” contact that indi-
cates the position of the Source 1 power-switching
device.
15F. Source 2 Position Indication Contact
This feature provides 1 Dry Form “C” contact that indi-
cates the position of the Source 2 power-switching
device.
23. Plant Exerciser (PE)
This feature provides a means for automatic testing of
the engine/generator set or standby power system. All
programmed time delays will be performed during plant
exerciser operations.
23K. Plant Exerciser Selectable – Disabled/1/7/14/28 Day
Interval
This feature provides for automatic test operation of
the generator. Available test cycles are daily, 7, 14,
or 28 days with duration equal to the programmed
engine test time.
Programmable setpoints allow for selection of three
test cycles:
■ Engine Start/Run Only (No Load);
■ Exercise with Load Transfer; or Disabled
■ This is a “Failsafe” operation.
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-300 will begin the sequence of opera-
tions necessary to transfer the load circuit to the
Source 2 power source. All Feature 26 monitoring and
protection functions are “failsafe” operations.
26A. All Phase Undervoltage Protection
This feature provides all phase undervoltage monitor-
ing and protection.
Adjustable Undervoltage:
Dropout: 50-97% of nominal
Pickup: (Dropout +2%) to 99% of nominal
26D. Go to Source 2
This feature provides the capability for an external
contact opening to initiate a load power transfer to the
Source 2 power source. This includes starting the
engine/generator, performing the programmed time
delays, and the transfer operation. Re-transfer will
occur when the external contact is closed or under a
“failsafe” condition. A connection point on the con-
troller for the connection of an external contact is
included.
29. Alternate Transfer Modes of Operation
Provides standard or optional transfer modes, mode
selection devices, and operational methods for ATSs.
29A. Automatic Operation
Provides fully automatic transfer, re-transfer, and
engine/generator startup and shutdown operations.
32. Delayed Transition Transfer Modes for Open Transition
Transfer Switches
This feature provides delayed transition transfer
modes for an open transition transfer switch. Often
used in systems with inductive loads, a delayed transi-
tion transfer switch may prevent or reduce in-rush cur-
rents due to out of phase switching of inductive loads.
32A. Time Delay Neutral
This feature provides a time delay in the neutral posi-
tion during the transfer and re-transfer operations dur-
ing which both Source 1 and Source 2 are
disconnected from the load circuit. The time delay is
programmable and is the same for both transfer and
re-transfer operations.
Adjustable 0 - 120 Seconds
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