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IM05805022K
Instruction Booklet
Page
6
Effective: January 2012
ATC-300+ Automatic
Transfer Switch Controller
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. 3-Phase Undervoltage and Underfrequency Protection
Adjustable Undervoltage:
Dropout (Breaker Style): 50 - 97% of nominal
Dropout (Contactor Style): 78 - 97% of nominal
Pickup: (D2%) - 99% of nominal
Adjustable Underfrequency:
Dropout (Breaker Style): 90 - 97% of nominal
Dropout (Contactor Style): 90 - 97% of nominal
Pickup: (D1Hz) - 99% of nominal
26K. 3-Phase Overvoltage/Overfrequency
Adjustable Overvoltage:
Dropout (Breaker Style): 105 - 120% of nominal
Dropout (Contactor Style): 105 - 110% of nominal
Pickup: 103% - (Dropout - 2%) of nominal
Adjustable Overfrequency:
Dropout (Breaker Style): 103 - 110% of nominal
Dropout (Contactor Style): 103 - 105% of nominal
Pickup: 101% - (Dropout -1Hz) of nominal
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 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 set-
points 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 ATSs.
29J. Type of Operation (MANTR) Operation (new feature)
This feature provides for a seletion between an automatic
transfer and re-transfer mode or a manual pushbutton
re-transfer to Normal from the Emergency Source mode.
The factory default 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 systems
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 1 N.C. contact.
36.
Emergency Inhibit (new feature)
This feature enables the Emergency inhibit control input to
inhibit transfers to the Emergency Source. See Control
Inputs section for more information.
48F. RS-485 with Modbus Option
Provides communications for the ATC-300+ via Modbus
through an integrated RS-485 port. Registers are available
to read back status, voltages, frequencies, and historical
data. Registers are also available for transfer switch con-
trol. Setpoints may be read back and/or programmed via a
pass-through command. See the ATC-300+ Modbus Com-
munication Guide pn: 66A7787.
