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IB ATS-1005
Instructional Booklet
Page
6
Effective: March 2010
Instructions for Installation, Operation and Maintenance of the
Eaton ATC-600 Automatic Transfer Switch Controller
Optional Feature 32A: Time Delay Neutral (TDN)
This feature provides a time delay in the transfer switch Neutral
position when both breakers are open. This delay takes place
when the load is transferred in either direction to prevent exces-
sive in-rush currents due to out-of-phase switching of large motor
loads. This feature is not available with the Neutral Load Sense
Delay (TDNLD) feature.
Optional Feature 32B: Load Voltage Decay (LDCY)
This feature utilizes the load voltage measurements to sense back
EMF that is generated when the transfer switch is in the Neutral
position. It provides a delay in transfer in either direction if an
unacceptable level is sensed as established by a customer pro-
grammed level. The transfer will not take place until the back EMF
decays below the acceptable programmed level. This feature has a
separate setting of enabling or disabling the operation. If disabled,
the transfer switch will not delay in the Neutral position and will
transfer between the sources as fast as possible. This feature is
not available with the Time Delay Neutral (TDN) Feature 32A.
Optional Feature 32C: In-Phase/Load Voltage Decay
In-phase transition is a feature that will allow a transfer between
two live sources only when the phase difference between the two
sources is near zero. This is an open transition transfer that pre-
vents in-rush currents from exceeding normal starting currents in
the case where motor loads are being transferred.
Load Voltage Decay utilizes the load voltage measurements to
sense back EMF that is generated when the transfer switch is in
the Neutral position. It provides a delay in transfer in either direc-
tion if an unacceptable level is sensed as established by a cus-
tomer programmed level. The transfer will not take place until the
back EMF decays below the acceptable programmed level. This
feature has a separate setting of enabling or disabling the opera-
tion. If disabled, the transfer switch will not delay in the Neutral
position and will transfer between the sources as fast as possible.
This feature is not available with the Time Delay Neutral (TDN)
Feature 32A.
Optional Feature 32D: In-Phase/Time Delay Neutral
In-phase transition is a feature that will allow a transfer between
two live sources only when the phase difference between the two
sources is near zero. This is an open transition transfer that pre-
vents in-rush currents from exceeding normal starting currents in
the case where motor loads are being transferred.
Time Delay Neutral provides a time delay in the transfer switch
Neutral position when both breakers are open. This delay takes
place when the load is transferred in either direction to prevent
excessive in-rush currents due to out-of-phase switching of large
motor loads. This feature is not available with the Neutral Load
Sense Delay (TDNLD) feature.
Optional Feature 35: Pre-Transfer Signal (TPRE)
Typically associated with elevator controls, this feature provides
for the control of an addressable relay to remotely signal an eleva-
tor that a re-transfer is about to take place. A permissive report-
back signal from the elevator, telling the ATC-600 that the eleva-
tor has reached the floor and opened its doors, is also recognized
to facilitate faster transfer operation. Should the permissive signal
not be used or does not occur, the ATC-600 has a programmed
overriding pre-transfer delay timer that can be set from 0 to 5 min-
utes.
Optional Feature 36: Emergency Inhibit
This feature enables the Emergency Inhibit control input to inhibit
transfers to the Emergency Source. See Control Inputs section for
more information.
Optional Feature 37: Service Equipment
This factory programmed feature makes the transfer switch suit-
able for a service equipment rating by responding to a Go-To-Neu-
tral input.
Optional Feature 45: Load Sequencing Capability (TSEQ)
This feature provides the sequential closure of up to 10 remote
relays after a transfer. A customer programmed time delay is
available to delay closure between each of the relays.
Optional Feature 46: Potential Transformer (PT) Ratio
This feature allows external voltage transformers to be used on
the ATC-600’s source and load sense inputs. Once this option is
enabled, the PT Ratio setpoint can be adjusted in steps of 1,
between 2:1 and 500:1. Also when this option is enabled the
Nominal System Voltage setting will be fixed at 120 or 110 volts,
depending upon the Nominal System Frequency setting. If the
Nominal System Frequency setting is 60Hz then the Nominal Sys-
tem Voltage will be fixed at 120 volts and all voltage pick-up and
drop-out setpoints will be based upon the 120 volt level. The
same is true of a Nominal System Frequency of 50Hz whose Nom-
inal System Voltage will be fixed at 110 volts. The metering dis-
play will use the PT ratio value to calculate and display the load
and source voltages with up to three significant digits. There will
be four possible types of displays, as an example they could dis-
play 999K, 99.9K, 9.99K, or 999 volts.
48: Communication Modules
Provides communications modules for the ATC-600 and ATC-800
transfer switch controllers. These controllers are PowerNet and
Modbus compatible devices. A separately mounted communica-
tions module will enable the automatic transfer controller to be
remotely monitored controlled and programmed via the network.
48F: RS-232 and RS-485 with Modbus
Provides communications for the ATC-600 via RS-232 or Modbus
through an RS-485 port. Registers are available to read back sta-
tus, voltages, frequencies, and historical data. Registers are also
available for transfer switch control. Setpoints may be read back
and/or programmed via a pass-through command.
