TDC-100 Series
AC Digital High-Resolution Controller
Installation & Maintenance Manual
4
07/24/20
www.atcontrols.com
IOM08032 REVISION 01
POWER / SIGNAL (J2)
Power is connected to pins 1, 2, and 3 as shown in the
block diagram. The fuse installed on the unit is rated for
maximum output current that can be safely delivered by
the AC outputs. Replacement fuses must not exceed the
maximum rating to prevent damage to the unit. Smaller
fuse sizes can be used with smaller motors - consult the
actuator manufacturer for appropriate fuse size and type.
An appropriate command signal, either 0-5V, 0-10V, 1-
5V, 2-10V, or 4-20mA, should be connected to pin 5 or 6
(as shown in the Block Diagram) while using pin 4 as the
return
signal ground
. The TDC-100 must be configured
for the type of command signal that is to be used (see
COMMAND TYPE).
Pin 7 of J2 provides an aux5V output which can be
used to connect a command potentiometer. By
connecting one end of a potentiometer to pin 7, the other
end to pin 4, and the wiper to pin 6, a local control knob
can be implemented. Pin 8 provides an aux15VDC
output which can be used to power an input or output 4-
20mA transmitter.
ACTUATOR (J1)
The actuator motor and feedback potentiometer are
connected to J1 as shown in the Block Diagram. The
Motor Neutral wire must be connected to pin 2, while one
motor winding is connected to pin 1 and the other winding
to pin 3. The feedback potentiometer wiper must be
connected to pin 5, while one end is connected to pin 4
and the other end to pin 6. The
Polarity Detection
feature of the TDC-100 automatically determines which
motor winding to control based on where the
open
and
closed
positions are set; this feature also eliminates the
need to rewire the unit for direct or reverse acting
applications.
When the ▲ and ▼ buttons are used to control the
actuator, the ▲ button will turn on the motor winding
connected to pin 1, while the ▼ button will turn on the
motor winding connected to pin 3. See MANUAL/FB POT
CAL for more details.
OVERRIDE (J7)
J7 provides a simple 2-wire connection that can override
the TDC-100 to perform a variety of external control
functions. Using an appropriate interface module,
commonly used auto/manual station switches are easily
implemented with low voltage/low current switches. See
Special Applications for more details. The factory
installed jumper between pins 1 and 2 enables normal
operation of the TDC-100 and must be installed if the
external override functions are not used.
MODE
The MODE button is used to select the desired function
of operation. When the MODE button is pressed, the unit
will switch to the next function and the appropriate LED
indicator will turn on to let the user know which function is
selected. Except for the MANUAL/FB POT CAL mode,
the associated mode indicator will be steady on; for some
of the modes other indicators will flash to indicate specific
settings associated with the mode. Each of the modes
are described in more detail in the following sections.
If a 0-5V or 0-10V command signal is used, the LOSS OF
COMMAND function cannot be used. The MODE button
will skip over the LOSS OF COMMAND mode when the
unit is configured for a 0-5V or 0-10V command signal
(see COMMAND TYPE). When the OVERRIDE mode is
enabled (see OVERRIDE MODE), the MODE button is
disabled and the Manual/Pot Cal indicator will turn on
steady.
ADJUST UP (▲) and ADJUST DOWN (▼)
The adjust up (▲) and adjust down (▼) buttons are used
to adjust the setting of any given function. When a
function is selected by the MODE button, the adjust
buttons will affect that function only. Note, that the AUTO
mode does not have any adjustable settings, and
therefore, the adjust up (▲) and adjust down (▼) buttons
have no effect. Also, the adjust buttons are disabled in
the OVERRIDE mode.
OVERRIDE MODE
The OVERRIDE mode is not selected by the MODE
button and can be enabled at anytime by connecting a
resistance greater than 250 ohms to the Override Input
(J7 pin 1 and pin 2). While the OVERRIDE mode is
enabled, the MODE button and adjust buttons are
disabled, and the Manual/Pot Cal indicator will turn on
steady to indicate that the unit is being controlled by the
Override Input. Shorting J7 pin 1 to pin 2 returns the unit
to normal operation and the previously selected mode.
Note that earlier models may not have connector J7, and
therefore do not have the OVERRIDE mode feature.
Controlling the TDC-100 from the Override Input is
accomplished by connecting a specific resistance to
select a specific operation. The table below defines the
operations and their associated resistance. See Special
