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Selecting PID Control or ON/OFF Control Section 3-3
3-3 Selecting PID Control or ON/OFF Control
Either 2-PID control (PID control with two degrees of freedom) or ON/OFF
control can be selected. The control method is selected by using host commu-
nications or the E5ZN-SDL Setting Display Unit to change the “PID/OnOff”
parameter. Set the control method for channels 1 and 2 separately. Default is
for PID control.
2-PID Control For PID control, the “proportional band (P),” “integral time (I),” and “derivative
time (D)” parameters must be set.
These PID constants can be set by autotuning or manual setup.
ON/OFF Control In ON/OFF control, the control output is turned ON when the PV is lower than
the current SP, and the control output is turned OFF when the PV is higher
than the current SP (for reverse operation).
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