TMC-4 Control Card
for Electric Actuators
Installation & Maintenance Manual
3
07/02/21
www.atcontrols.com
IOM08139 REVISION 04
1. Layout
1 – Power / Motor Terminals (P1)
Terminals for connecting supply power, motor
connections, enclosure heater, and for external brake for
spring return actuators. Refer to 2.1 for details.
2 – Signal Terminals (P2)
Terminals for connecting control signal, analog
feedback signal, +24VDC output and Earth/chassis
ground connection. Refer to 2.1 for details.
3 – Fuse
The fuse is a standard 5x20mm time delay fuse rated for
10A, 250V. Replacement fuses shall not exceed this
maximum rating.
4 – Expansion Header (P4) (option)
14 point connection header for optional accessory
interfaces.
5 – Position Switches Header (P5)
3 point connection header for positioning limit switches
when required for actuator control. Switches connected
to this header provide position limits when operating as
two-position actuator, and provide Open/Close status for
the TMC4.
7 – Feedback Potentiometer Header (P7)
3 point connection header for feedback potentiometer
when required for actuator control. This provides
positioning feedback for when operating as a
proportional control actuator.
8 – Thermistor Header (P8) (option)
2 point connection header for optional motor
temperature monitor thermistor to prevent motor
overheating.
9 – Stop (Torque) Switches Header (P9)
3 point connection header for motor stop limit switches
when required for actuator control. Switches connected
to this header will stop the motor when activated, without
providing Open/Close status. These switches are useful
when driving motor directly with the control card, rather
than driving the motor through limit or torque switches.
This would typically be for DC motor applications, where
operating motor through limit switches is not practical.
10 – Option Module Slot
mSATA / Mini PCI Express connection point for optional
feature modules such as for serial communication or
other control types. Option modules can be installed with
(2) 4-40 screws, 3/16” to 1/4" in long.
Insert option module into
connector and rotate flat. Tighten
with #4-40 screws.
