IB01602008E For more information visit: www.eaton.com
Instructional Booklet
Effective: March 2014 Page 15
ATC-300 Breaker Based Transfer Switch
23. Plant Exerciser (PE)
This feature provides a means for automatic testing of the
engine generator set or standby power system. All pro-
grammed time delays will be performed during plant exer-
ciser operations.
23K. Plant Exerciser Selectable – Disabled/1/7/14/28 Day Inter-
val
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 protection
functions. If the Source 1 power supply fails, then the
ATC-300 will begin the sequence of operations necessary
to transfer the load circuit to the Source 2 power source.
All Feature 26 monitoring and protection functions are “fail-
safe” operations.
26A. All Phase Undervoltage Protection
This feature provides all phase undervoltage monitoring and
protection.
Adjustable Undervoltage:
Dropout: 50-97% of nominal
Pickup: (Dropout +2%) to 99% of nominal
26C. All Phase Overvoltage Protection
Provides all phase overvoltage monitoring and protection.
Adjustable Overvoltage:
Dropout: 105-120% of nominal
Pickup: 103% to (Dropout -2%) 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 controller for the connection of an external contact is
included.
26E. All Phase Underfrequency Protection
Provides all phase underfrequency monitoring and protec-
tion.
Adjustable Underfrequency:
Dropout: 90-97% of nominal
Pickup: (Dropout +1Hz) to 99% of nominal
26F. All Phase Overfrequency Protection
Provides all phase overfrequency monitoring and protection.
Adjustable Overfrequency:
Dropout: 103-110% of nominal
Pickup: 101% to (Dropout -1Hz) of nominal
26H. Phase Reversal Protection
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 phase reversal setpoint,
the source will be considered “Unavailable”.
For a 3-phase delta source, this feature should be turned off
via the PHASE REV setpoint.
26L. Source 1 3-Phase Voltage Unbalance
For a 3-phase wye source, this feature monitors phase volt-
age ratios. Voltage unbalance (%) is calculated as the dif-
ference between the maximum and minimum phase voltage,
divided by the minimum phase voltage. User-selectable set-
points are available for dropout and pickup unbalance set-
tings (minimum 2% differential). 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 sec-
onds 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 1, the
Unbalance Timer (TD UNBAL) starts timing. After TD
UNBAL times out, Source 1 is declared “failed”.
For a 3-phase delta source, this feature should be turned off
via the VOLT UNBAL setpoint.
29. Alternate Transfer Modes of Operation
Provides standard or optional transfer modes, mode selec-
tion devices, and operational methods for Transfer
Switches.
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 transition transfer switch
may prevent or reduce inrush currents due to out of phase
switching of inductive loads.
32A. Time Delay Neutral
This feature provides a time delay in the neutral position
during the transfer and re-transfer operations during 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
To Next Page
Loading...
