Open Frame PID Temperature Controllers
reduce installation costs.
Available from Audon Electronics is a unique range
of low-cost open frame temperature/process controllers.
There are several controllers in the range for use with
either traditional AC loads or with DC Peltier-type heat
engines.
All controllers feature serial communication ports, PID control,
alarms, built-in Solid State Relay output and easy-to-use
programming software. Once programmed, these controllers
can operate in stand alone mode or can form part of a larger
SCADA system. These controllers make for a lower cost
alternative to traditional panel-mount controllers, and their
on-board Solid State Relays reduces installation costs.
The model 5C7-461 is a 250VAC 15A output temperature
controller that accepts type J, K, or S thermocouples or a
±100mV process input.The controller consists of a printed
circuit card mounted to an integral heat sink/mounting bracket
that is DIN compatible and may be mounted either horizontally
or vertically. Connections are via screw and spade terminals.
The 5C7-461 controller is configured through a RS485
communications port using the Windows setup program.
Once the controller is configured, the PC may be disconnected
and the controller can be left to operate as a stand-alone unit.
The software allows the operator to select the applicable
thermocouple type and scaling, set PID tuning parameters,
set control limits, configure alarms, give the controller an
identifying name, select either heating or cooling mode, plus
select and enable a protective password.
Controller tuning parameters consist of proportional bandwidth
(P), integral gain (I), and the derivative rate (D) for selecting
P, PI, PD, or PID operation. An on/off operating mode with
an adjustable hysteresis may also be selected. Alarm selections
consist of no alarm function, a fixed high and/or low temperature
alarm or tracking alarms. These alarms can be selected for
either latching or non-latching operation and drives an alarm
relay output. Alarm reset is accomplished either via the PC
communications interface or an optional local switch.
The Windows software also permits the monitoring of actual
temperature, set temperature, percent of power applied to the
load, and alarm status in. It allows selection of the set temperature,
turning the power on or off, cancelling an alarm condition, tuning
the controller settings and displaying the current sensor selection.
The model 5C7-252 is a similar controller but has a RS232
communication port and is designed for use with thermistors.
The models 5C7-361/362 are designed to provide bi-directional
control of Peltier-type thermoelectric heat engines for both cooling
and heating applications. The controllers "H" bridge MOSFET
output drive configuration allows for the bi-directional flow of current
through the thermoelectric modules with a capacity up to 25A.
__________________________________________________
March 2003
