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The
5R7-001/5R7-002 is a bi-directional, H-bridge controller designed to
control thermoelectric modules with the option to set as
unidirectional. The controller accepts an input voltage of 12-36VDC.
The output voltage can range from 0 to 36VDC if a split supply is
used. The load circuit is pulse width modulated at 2.7KHz and
delivers a load of .1 to 25 Amps. Temperature resolution for this
controller is 0.01°F, providing end point control stability up
to ±0.01°C in a well designed thermal system.
The
H-bridge configuration allows for a seamless transition between
heating and cooling. Using a PC with an RS232 or RS485 interface, the
controller can be set for any of the following control configurations:
On/Off control, differential temperature control, manual control or
any combination of PID control. The user friendly software requires
no programming experience to set up the controller. The RS232/RS485
interface has 1500 VAC isolation from all the electronic circuitry
minimizing the interference from noise or errant signals. Once the
controller is set up, the computer may be disconnected and the
controller becomes a stand alone unit. If the computer is left
connected, it can be used for data acquisition in a half duplex mode.
The temperature may also be set through the optional display or
through a remote potentiometer.
The
PC software also provides for several alarm types and the controller
has 3 outputs for alarms with a 5VDC output rated for 25mA of current.
In the set up menu the alarm function may be set as no alarm,
tracking alarm, fixed value alarm or computer controlled alarm. The
menu also offers selections for latching and for maintaining or
cutting the power during an alarm. The alarm sensor may by the
control temperature sensor or a secondary sensor.
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