TMC-4 Control Card
for Electric Actuators
Installation & Maintenance Manual
21
04/06/22
www.atcontrols.com
IOM08139 REVISION 04
4.5.
Reverse Action / Direct Action
The TMC4 can be configured for reverse or direct action depending on the signal given when setting the command and
feedback zero and span. For direct action, set the zero value to the minimum command signal and the span value for the
maximum command signal. For reverse action, set the zero value to the maximum command signal and the span value to
the minimum command signal.
The calibrated zero command or feedback value will correspond to the calibrated Close position in the
POSITION
CONFIG
submenu, and the calibrated span command or feedback value will correspond to the calibrated Open position in
the
POSITION CONFIG
submenu.
Direct
Action
Signal
Command Feedback
Position
0%
Zero
Zero
Close/CW
100%
Span
Span
Open/CCW
Reverse
Action
Signal
Command Feedback
Position
100%
Zero
Zero
Close/CW
0%
Span
Span
Open/CCW
5. Options
5.1.
Motor Temperature Monitor
The TMC4 provides an optional motor temperature monitor using a thermistor connected to header (P8) to monitor the
case temperature of the actuator motor. This is useful in high cycle applications to prevent excessive motor heating that
may cause premature failure.
The thermistor provides a temperature-dependent resistance that the TMC4 inputs into an algorithm to establish a defined
duty cycle limit depending on the measured temperature. As the temperature increases, the duty cycle is decreased to
allow more time for the motor temperature to be reduced.
The default setting for the TMC4 is for the monitor to be disabled. The three temperatures allow for higher insulation class
motors to operate before the need to limit the motor movement, but it is recommended to use the lowest level.
Temp. Level
Temp. Limit 1
Temp. Limit 2
Temp. Limit 3
Minimum
Insulation
Class
Disabled
n/a
n/a
n/a
1
75°C
90°C
105°C
B
2
90°C
105°C
120°C
F
3
105°C
120°C
135°C
H
Duty Cycle
60%
40%
20%
NOTE:
The motor temperature monitor is intended to only serve as a backup to prevent motor overheating. The user
should still ensure their controls are adjusted so the recommended duty cycle of the actuator is not exceeded and not
solely rely on the motor temperature monitor.
M O T O R T E M P
L I M I T :
x x x x
Motor
Temperature
Monitor
Sets temperature ranges for the motor temperature monitor connected to (P8). Selected value indicates threshold
for restricted motor operation. Below values indicate duty cycle restriction. DEFALUT = Disabled
Disabled:
Ignores input to thermistor header (P8).
75C:
Below 75C = normal
75C to 90C = 60%
90C to 105C = 40%
Above 105C = 20%
90C:
Below 90C = normal
90C to 105C = 60%
105C to 120C = 40%
Above 120C = 20%
105C:
Below 105C = normal
105C to 120C = 60%
120C to 135C = 40%
Above 135C = 20%
