TMC-4 Control Card
for Electric Actuators
Installation & Maintenance Manual
1
07/02/21
www.atcontrols.com
IOM08139 REVISION 04
Installation and Operation Manual
TMC-4 Control Card (v3.00)
Features
4-20mA, 0-10VDC, 0-5VDC, Potentiometer,
Open/Close command inputs
4-20mA or 0-10VDC self-powered transmitter
Programmable fail positions on loss of command
signal: In Place, CW, CCW, % Value
LCD screen with 5-point joystick for menu navigation
Expansion module slot
External brake control for spring return actuators
Motor temperature monitor by thermistor input
Sleep mode
Overview
The Triac TMC4 control card is a motor controller intended to be used in electric actuators rated for running current loads
up to 10 amps. The TMC4 control card is available in two versions. An AC version can drive reversible AC motors with a
85-250VAC supply voltage, or a DC version can drive DC motors with a 24VDC supply voltage.
The LCD screen provides easy viewing of status and configuration while a 5-point joystick allows easy navigation through
the various configuration menus and settings. An optional module slot permits expansion on the capabilities of the
controller to support various communication busses or other control and interface options.
The TMC4 provides two main positioning options; proportional or two position. When operated as a proportional controller,
the TMC4 compares an external command signal to a position feedback from a potentiometer connected to the output
shaft of the actuator. When the two signals differ by a given magnitude, the TMC4 controller will energize the motor to
operate either clockwise or counterclockwise to reduce the difference between the two signals. When operated as two-
position controller, the TMC4 receives an open or close command, and drives the actuator clockwise or counterclockwise
until activation of a position limit switch is detected.
The TMC4 is designed to be mounted using PEM Snap-Top spacers for easy mounting and removal without the need for
screws, while still providing a secure mount for most conditions.
The TMC4 must be installed in an appropriate enclosure to avoid electrical shocks. When operating,
high voltages will be present on the controller, requiring caution during the installation process. Power
should be deenergized before making wire connections to the TMC4. A heater and thermostat should
be used when possible, to prevent condensation.
