FOXBORO P0926KP module

FOXBORO P0926KP module

Technical data of product parameters

Autotuning is performed at the maximum allowed output. If you have set an output limit, autotuning P0926KP
occurs at that value. Otherwise, the control output is set to 100% during the autotune. Only the heat
output (output 1) of a loop may be autotuned.
The PID constants are calculated according to process’s response to the output. The loop need
not reach or cross setpoint to succ essfully determine the PID parameters. While autotuning the P0926KP
controller looks at the delay between when power is applied and when the system responds in order
to determine the integral term (TI). The controller then looks for the slope of the rising temperature
to become constant in order to determine the proportional band (PB). The derivative term (TD) is
derived mathematically from the TI.
When the controller has finished autotuning, the loop’s control status switches to AUTO. If the
process reaches 75% of the setpoint or the autotuning time exceeds 30 minutes, the controller
switches to AUTO and applies the PID constants it has calculated up to that point. P0926KP
The autotune is started at ambient temperature or at a temperature above ambient. However, the
temperature must be stable and there must be sufficient time for the controller to determine the new
PID parameters.The thermocouple reversed alarm occurs if the temperature goes in the opposite direction and to
the opposite side of ambient temperature than expected—for example, a loop is heating and the
measured temperature drops below the ambient temperature.
The thermocouple reversed alarm is disabled by default. To enable this alarm, set the REVERSED
T/C DETECT parameter in the SETUP LOOP INPUTS menu to ON. It may be disabled if false
alarms occur in your application.

Product picture display

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