TMC-4 Control Card
for Electric Actuators
Installation & Operation Manual
1
03/18/21
www.atcontrols.com
IOM08139 REVISION 01
Installation and Operation Manual
TMC-4 Control Card (v2.02)
1. Overview
The Triac TMC-4 control card is a motor controller intended to be used in electric actuators rated for running current loads
up to 10 amps. It can drive split phase 120V to 230V AC motors or 12V and 24V DC motors from a single board by simply
selecting the supply voltage type with an on-board switch.
Option slots permit easy expansion on the capabilities of the controller to support various communication busses or other
control options. It is available in two versions to accommodate a variety of actuator sizes. The TMC-4A002-001 controller
can control smaller actuators, and has a single option module slot, while the TMC-4A002-002 is used for controlling larger
actuators and has two option module slots.
When operated as a proportional controller, the TMC-4 compares an external command signal to a position feedback,
typically a potentiometer, that is coupled to the output shaft of the actuator. When the magnitude of the two signals differ
by a given magnitude, the TMC-4 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 TMC-4 receives an open or close command, and drives the actuator
clockwise or counterclockwise until closure of a position limit switch is detected.
The TMC-4 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 TMC-4. A heater and thermostat
should be used when possible to prevent condensation.
