IB01602015E
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Instruction Booklet
Effective: August 2010
Page
11
ATC-300 2-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.
32F. In Phase Transition
Provides In-Phase transition, which is a feature that will
permit a transfer or re-transfer between 2 available
sources that have a phase angle difference of 8 degrees or
less. The In-Phase transition feature includes permissible
frequency difference and synchronization time setpoints.
In the event source 1 and source 2 fail to synchronize
within a specified amount of time, due to excessive phase
angle difference or frequency difference, then the transfer
will take place under delayed transition. Alarm relay will
energize and failure will be logged into the transfer history
as either “Sync Fail – Freq” or “Sync Fail – Phase”
depending on whether the frequency difference or the
phase difference was excessive. The adjustable frequency
difference is 0.0 to 3.0 Hz. If the synchronization does
not occur within a specified amount of time, the Alarm
relay will energize and the failure will be logged into the
Transfer History as either “Sync Fail - Freq” or “Sync Fail -
Phase” depending on whether the frequency difference or
the phase difference was excessive.
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.
42.
Seismic Withstand Capability
Provides transfer switch with seismic capability exceeding
the worst case Zone 4 required per both the Uniform
Building Code and the California Building Code.
