Synergy Controller Technical Manual, Revision H
Page 210
16.0 CONTROLLER TUNING AND CALIBRATION
16.1 PID Tuning
Synergy Controller implements high performance PID algorithms for up to 4 channels. The PID tuning
parameters are shown in the following screenshot. Tuning parameters are available for each half of the split
Push/Pull, Heat/Cool system. In addition, Cascade (Product temperature) control features are available to
improve test speed and accuracy when the product temperature must be controlled explicitly.
PID
PID is the abbreviation for Proportional, Integral, and Derivative and is a popular control algorithm.
PID controllers are used to regulate the process variable (temperature, humidity, etc.) at a setpoint.
The control variable is the output of the controller and it changes in response to changes in process
value or setpoint.
PID Output = Propor In Derivative
The Proportional Band, Reset and Rate constants control the calculation of the PIDs.
P
Proportional Band = 100/gain
I
Integral = 1/reset
(units of time)
D
Derivative = rate
(units of time)
Error – Err
Error is the difference between the Set Point (SP) and actual Process Values (PV).
Error = SP – PV
Proportional Band (PB)
The Proportional Band (PB) is the range of error that drives the output from 0 to 100%. When the
error is within the Proportional Band, the P output term is proportional to the error. Decreasing the
proportional band increases the controller gain. (Tuning note: increasing the controller gain can
make the process faster but less stable.)
If the Error < the Proportional Band
Proportional Output = (error)*100/(proportional band)
Else
Proportional Output = 100%.
Integral – In
With integral action, the “I” portion of the controller output is proportional to the integral of the error.
Integral action will eliminate any steady state error of a strictly proportional control. (Tuning Note:
Increasing the reset (the integral gain) can destabilize the controller, decreasing the reset can
stabilize and slow the system response.)
Integral Output =
∫
(100/proportional band * Reset * Error)
Summary of Contents for Synergy Compact
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Page 142: ...Synergy Controller Technical Manual Revision H Page 142 TE1708 6 Relay Board Schematic...
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