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Model TC-24-12 Temperature
Controller
![[THE TC-24-12 TEMPERATURE CONTROLLER]](images/tc24-12.jpg)
APPLICATION
The TC-24-12 provides bi-polar control for on-demand heating or cooling as
required to maintain a set temperature. The controller is also well suited
for customers that desire a controller with on-board temperature status
indicators, an over-temperature alarm, or signal test-points to aid in the
setup and monitoring the sensor and potentiometer voltages.
TECHNICAL DESCRIPTION
The TC-24-12 uses pulse-width-modulation (PWM) at 1000 Hz to control the
average power being applied to the thermoelectric cooler. Proportional and
integral control settings can be adjusted to fine-tune the control
stability. The controller consists of a microprocessor, thermistor inputs,
a power output stage, and set-temperature/tuning potentiometers.
Temperature status indicator LED's and test points are also included. For
high-volume applications, the tuning potentiometers can be removed and
set-point/tuning parameters can be preprogrammed from the factory to
further reduce the controller's cost and set up time.
Two optional thermistors or thermostats can be used to detect fault
conditions so that power is automatically turned off when a fault is
detected. The controller can be set up to automatically restart if the
fault clears itself, or it can be set for manual restart in which power to
the controller must be turned off and then on again to resume temperature
control. An output connection on the circuit board is also included to
signal external devices of a fault condition.
The TC-24-12 operates with an input voltage range of 10.8 to 26.4 VDC. (A
minimum of 10.8 VDC input is needed to operate the on-board
microprocessor.) It will control output currents of up to 11.9 amps
maximum. Bi-polar output is provided by an H-bridge output stage, which
uses highly efficient N-channel MOSFET output devices so that no
additional heat sinking is needed. Furthermore, the PWM methodology (when
used properly) does not adversely affect the cooler's reliability that
might otherwise happen with typical on-off/thermostatic types of
controllers.
Note: The TC-24-12 comes with one MP-2379 thermistor. If you would like to
purchase additional thermistors, please indicate when ordering.
SPECIFICATIONS
- Input voltage from 10.8 to 26.4 volts DC (external power supply
required)
- Maximum 11.9 amps output current
- Proportional-Integral (PI) control
- Bi-directional, solid-state H-bridge operation for heating and
cooling applications
- Pulse-width modulation of output at 1000 Hz
- Control temperature of –20 °C to 100 °C using MP-2379 thermistor
(supplied with the controller)
- Control stability of up to ±0.3 °C (when controlling a cold plate)
- Proportional (P) bandwidth adjustment of 1.0 °C to 15.0 °C and
Integral (I) rate adjustment of 0 to 2.55 repeats per minute
- Removable terminal strip for easy connection of power, cooler, and
thermistors
- Test points for reading Set Temperature, P, I, and thermistor
voltages
- Temperature status LED's
- Two inputs for optional, over-temperature thermistors or thermostats
- Over-temperature alarm with alarm output transistor configurable for
continuous shutdown or automatic resetting of output power
- Fault detection indications through the LED's
- Operating temperature range: 0 to 60 °C
- Storage temperature range: -55 to 105 °C
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