Specifications

February 2007
16-46
For more information visit: www.eaton.com CA08101001E
Transfer Switches
16
Transfer Switch Equipment
Transfer Switch — Standard and Optional Features
Transfer Switch — Standard
and Optional Features for
Cutler-Hammer Transfer
Switches
Timers
1. Time Delay Normal to Emergency
(TDNE)
Provides a time delay to allow for the
generator to warm up before transfer-
ring the load from the Normal Source
to the Emergency Source. Timing
begins only after the Emergency Source
becomes available and deemed good
based on the programmable voltage
and frequency set points in the
controller.
2. Time Delay Engine Start (TDES)
Provides a time delay before initiating
the generator start cycle. This is to
account for momentary power outages
or voltage fluctuations of the Normal
Source. Provides a Form “C” contact
to the generator starter circuit.
3. Time Delay Emergency to Normal
(TDEN)
Provides a time delay of the re-transfer
operation to permit stabilization of the
Normal Source. Timing begins only
after the Normal Source becomes
available and deemed good based
on the programmable voltage and
frequency set points in the controller.
This function is fail-safe protected.
4. Time Delay Engine Cooldown
(TDEC)
Provides a time delay before initiating
the generator stop cycle after the
re-transfer operation. This allows the
generator to cool down by running
unloaded. Timing begins on comple-
tion of the re-transfer cycle.
7. Time Delay Emergency Fail (TDEF)
Provides a time delay that prevents
a connected emergency source from
being declared “Unavailable” based
on the customer’s set points. This is to
account for momentary generator fluc-
tuations. If the Source 2 remains in a
failed state, then 0.5 second after the
TDEF timer expires the transfer switch
will proceed with the programmed
sequence for re-transfer if Source 1
is available. This time delay is only
implemented when Source 2 is a
generator.
Note: This feature is also enabled when
large loads cause generator output to drop
below customer set points.
Plant Exerciser
23A. Plant Exerciser With Fail-safe
Provides a means for automatic testing
of the engine generator set or standby
power system. All programmed time
delays in the controller will be performed
during plant exerciser operations.
Programmable set points for test
intervals are start time, either disabled,
daily, 7, 14 or 28 days.
15-minute fixed engine test time.
Test may be performed with or without
load transfer. Test may be manually
cancelled during the operation. This
function is “fail-safe” protected.
23J. Plant Exerciser (PE) With Fail-safe
Provides a means for automatic testing
of the engine generator set or standby
power system. All programmed time
delays in the controller will be performed
during the plant exerciser operation.
Programmable set points for test
interval are Start Time, either disabled
or 7 days, and engine test time.
Test may be performed with or without
a load transfer. Test may be manually
cancelled during the operation. This is
a “fail-safe” operation.
23K. Plant Exerciser With Fail-safe
Provides a means for automatic testing
of the engine generator set or standby
power system. All programmed time
delays in the controller will be performed
during plant exerciser operations.
Programmable set points for test
intervals are start time, either disabled,
daily, 7, 14 or 28 days, engine test time.
Test may be performed with or without
load transfer. Test may be manually
cancelled during the operation. This
function is “fail-safe” protected.
Source 1 Sensing
26. Source 1 — Monitoring and
Protection
Provides Source 1 monitoring and pro-
tection functions. If Source 1 fails, then
the Automatic Transfer Controller will
begin the sequence of operations nec-
essary to transfer the load to Source 2.
All Feature 26 monitoring and protec-
tion functions are fail-safe operations.
26H. Three-Phase Rotation Protection
Provides three-phase reversal sensing
in order to protect against transferring
to an out-of-phase source. The controller
will treat the opposite source as
unavailable if the sources are out of
phase, based on programmable set
points in the controller.
26J. All-Phase Undervoltage/
Underfrequency Protection
Provides all-phase undervoltage/
underfrequency monitoring and
protection based on programmable
set points in the controller.
26K. All-Phase Overvoltage/
Overfrequency Protection
Provides all-phase overvoltage/over-
frequency monitoring and protection
based on programmable set points in
the controller.
26L. Three-Phase Voltage Unbalance/
Phase Loss
Provides phase loss detection from
blown fuses on the Source 1.
26M. Generator Utility Sensing
Allows for the switch to operate with
generators that have internal utility
sensing. This option comes as a kit
that needs to be field installed.
Source 2 Sensing
5. Source 2 — Monitoring and
Protection
Provides monitoring and protection
based on the Source 2 voltage and/or
frequency set points. All Feature 5
monitoring and protection functions
are fail-safe operations.
5J. All-Phase Undervoltage/
Underfrequency Protection
Provides Undervoltage/Underfrequency
monitoring and protection based on
programmable set points in the
controller.
5K. All-Phase Overvoltage/
Overfrequency Protection
Provides Over/Voltage/Overfrequency
monitoring and protection based
on programmable set points in the
controller.
5H. Three-Phase Rotation Protection
Provides three-phase reversal sensing
in order to protect against transferring
to an out-of-phase source. The controller
will treat the opposite source as
unavailable if the sources are out of
phase, based on programmable set
points in the controller.