IB ATS-C103
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Instructional Booklet
Effective: March 2012
Page
7
Instructions for Installation, Operation and Maintenance of the
Eaton ATC-800 Closed/Open Transition Transfer Switch Controller
Optional Feature 47C: Closed/In-phase Transition/Time Delay
Neutral Load Sense
Closed Transition is a feature that will temporarily parallel two live
sources in a make-before-break scheme when performing a trans-
fer. This achieves a transfer between sources with no power
interruption. Both sources must be synchronized in frequency,
phase, and voltage before the transfer is initiated.
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 Load Voltage Decay utilizes the load voltage measure-
ments 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 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 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
Optional Feature 32A.
Optional Feature 47D: Closed Transition Only
Closed Transition is a feature that will temporarily parallel two live
sources in a make-before-break scheme when performing a trans-
fer. This achieves a transfer between sources with no power
interruption. Both sources must be synchronized in frequency,
phase, and voltage before the transfer is initiated.
If the logic is forced into a fail safe mode (i.e. loss of connected
source), the logic will perform a load voltage decay open transfer.
Optional Feature 47E: Closed/In-Phase Transition/Time Delay
Neutral
Closed Transition is a feature that will temporarily parallel two live
sources in a make-before-break scheme when performing a trans-
fer. This achieves a transfer between sources with no power
interruption. Both sources must be synchronized in frequency,
phase, and voltage before the transfer is initiated.
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.
Optional Feature 48: Communication Modules
Provides communications modules for the ATC-800 transfer
switch controllers. These controllers are PowerNet and Modbus
compatible devices. A separately mounted communications mod-
ule will enable the automatic transfer controller to be remotely
monitored controlled and programmed via the network.
Optional Feature 48F: RS-232 and RS-485 with Modbus
Provides communications for the ATC-800 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.
Section 2: Hardware Description
2.1 General
The purpose of this section is to familiarize the reader with ATC-
800 hardware, its nomenclature, and to list the unit’s specifica-
tions. The information presented is divided into the following four
parts:
•
Operator Panel
•
Rear Access Area
•
External Hardware
•
Specification Summary
2.2 Operator Panel
The operator panel, which is normally accessible from the outside
of a panel or door, provides a means for:
•
Being alerted to specific conditions
•
Receiving functional help
•
Programming
•
Parameter Monitoring/Selection/Metering
LEDs, a display window, pushbuttons, and a mimic bus make up
the front accessible operator panel (Figure
1
).
Seventeen individual LEDs are lit when performing or indicating a
specific function. For detailed information on individual LEDs refer
to Paragraph 3.2.
The LED type display window is used to display all ATC-800 mon-
itored parameters, setpoints and messages in easy to read for-
mats. The alpha numeric display is approximately 0.75 by 4.25
inches and is able to display up to eight characters at a time. For
details concerning the kind of information that can be viewed in
the display window refer to Paragraph 3.3.
The front operator panel supports six long-life membrane pushbut-
tons. Pushbuttons accomplish their function when pressed and
released. Refer to Paragraph 3.4 for information concerning the
function of specific pushbuttons.
2.3 Rear Access Area
The rear access area of the ATC-800 is normally accessible from
the rear of an open panel door (Figure
2
).
All wiring connections to the ATC-800 are made at the rear of the
chassis. For the sake of uniform identification, the frame of refer-
ence when discussing the rear access area is facing the back of the
ATC-800 with the panel door open. The communication module
port, for example, is located on the upper right rear of the unit. The
Run/Program Switch, used to determine the ATC-800 Mode, is
located in the lower right near the control power inputs. Detailed
information relative to any connection made to the rear access area
is presented in Section 4 entitled “Operation.”
2.3.1 Left Rear of Chassis
The left rear of the chassis provides self locking female connec-
tors J1, J2 and J3 for voltage monitoring of Source 1 (S1),
Source 2 (S2) and the Load respectively. Terminal block J4 pro-
vides DC wetted connections for various functional inputs. See
Paragraph 4.3 for more information on input functionality.
2.3.2 Right Rear of Chassis
The right rear of the chassis provides a port that will accept the
D-sub male connector of the optional Communication Module
(PONI). A self locking female connector J7 is provided for Sources
1 and 2 control power input.
Customer programming is provided through the Program/Run Tog-
gle Switch. While the switch is in the Program position, the
ATC-800 continues to operate in keeping with previously pro-
grammed setpoints.
