IB01602078E
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Instruction Booklet
Effective: September 2011
Page
11
40-400A (480/600Vac) ATC-300+ 3-Postion
Contactor Based Transfer Switch
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
Automatic Transfer Controller will begin the sequence of
operations necessary to transfer the load circuit to the
Source 2 power supply. All Feature 26 monitoring and
protection functions are Failsafe operations.
26D. Go to Source 2
This feature provides the capability for an external contact
opening to initiate a load circuit 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 con-
tact is closed or under a Failsafe condition.
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 set-
point, the source will be considered “Unavailable”.
For a 3-phase delta source, this feature should be turned
off via the PHASE REV setpoint.
26J. All Phase Undervoltage and Underfrequency Protection
Adjustable Undervoltage:
Dropout: 78 - 97% of nominal
Pickup: (D2%) to 99% of nominal
Adjustable Underfrequency:
Dropout: 90 - 97% of nominal
Pickup: (D1Hz) to 99% of nominal
26K. All Phase Overvoltage/Overfrequency
Adjustable Overvoltage:
Dropout: 105 - 110% of nominal
Pickup:103% to (Dropout –2%) of nominal
Adjustable Overfrequency:
Dropout: 103 - 105% of nominal
Pickup: 101% to (Dropout -1Hz) of nominal
26L. Source 1 3-Phase Voltage Unbalance
.For a 3-phase wye source, this feature monitors phase
voltage ratios. Voltage unbalance (%) is calculated as the
difference between the maximum and minimum phase
voltage, divided by the minimum phase voltage. User-
selectable setpoints are available for dropout and pickup
unbalance settings (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 seconds is provided. The factory default
setpoints are: 5% dropout, 3% pickup, and 30 seconds
time delay. A user-selectable setpoint for enable and dis-
able 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 ATSs.
29J. Type of Operation (MANTR) Operation (new feature)
This feature provides for a selection between an automatic
transfer and re-transfer mode or a manual pushbutton re-
transfer to Normal from the Emergency Source mode. If
this option is not selected the factory default selection is
automatic.
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 sys-
tems with inductive loads, a delayed transition transfer
switch may prevent or reduce in-rush 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
35.
Pre-Transfer Signal
This feature provides a signal to a remote device prior to a
re-transfer operation. It provides one Form “C” contact
(NO/NC) for interface with other equipment (typically ele-
vator controls). The contacts close/open on a timed basis
prior to transfer in either direction. After TDNE/TDEN
times out, this relay closes and the Pre-transfer Timer
(TPRE) starts timing. After the TPRE times out, the trans-
fer proceeds by starting the TDN timer if enabled. The
pre-transfer relay opens after the transfer is complete.
Adjustable 0 - 120 Seconds
35A. Pre-Transfer Signal with 1 N.O. and 1 N.C. Contacts
This feature provides pre-transfer signal and includes 1
N.O. and 1N.C. contacts.
