Maintenance Timers
User may access and edit the maintenance interval presets and view the time remaining settings, if used by configuration.
If an interval time has elapsed, a message event is typically used to indicate maintenance is due.
Reset the timer after maintenance is performed by pressing the RST icon on this page.
Control Loop Setup
User may edit up to 8 configured control loop settings.
The settings on these pages differ depending on the type of control loop configured.
The control loops operate on the principle of a 0-100% output with special considerations for digital output loop types.
Section 50
2021-06-22 - 24 -
00-02-1032
Control Loop Typical
The pen chart shows the PID output (CO), Feedback (FB) and Setpoint over the last 2 minutes. Use this to help tune the closed loop control.
Press the Auto/Manual button change modes. In automatic, the control loop will try to maintain the setpoint +/- the deadband using calculation against the error (how far away from setpoint) of the loop.
Press the Manual Out edit box to set a desired output in manual if desired.
P = tunes for the Error at present condition.
I = adjust the output value on the accumulated error over time.
D = affects the output value based on the rate of change of the error.
Bigger numbers will result in larger changes in output %. General tuning guidelines start with I and D at low numbers, using only proportional. Once ringing is seen, reduce P slightly and increase I slowly. D may be introduced as a predictive measure, derivative adjust the output based on how much the error is changing in a given calculation loop.
Output ramp rates and min/max calculation limits are adjustable. Press loop overrides to adjust any possible control loop override factors.
The controller uses the parallel form of the PID equation as follows:
% Output = Kp(Error) + Ki∫(Error)dt + Kd×dErr or∕ dt
Section 50
2021-06-22 - 25 -
00-02-1032
