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60 ANASOFT User’s Guide

Appendix A: PID

Proportional, Integral and Derivative Control

For an improved level of control, use Derivative control with

Proportional or Proportional and Integral control. Derivative control

corrects for overshoot by anticipating the behavior of the process

variable and adjusting the output appropriately. For example, if the

process variable is rapidly approaching the setpoint, Derivative control

reduces the output, anticipating that the process variable will reach

setpoint. Use it to eliminate the process variable overshoot common to

PI control. (This figure shows a process under full PID control).

Control Outputs

The CLS provides a 5 Vdc digital output signal for PID control outputs.

These outputs normally control the process using relays. Watlow-

Anafaze can also provide a Serial Digital to Analog converter (SDAC)

for 0-5 Vdc, 0-10 Vdc, or 4-20 mA analog output signals.

Digital Output Control Forms

The next section explains different modes for control outputs.

On/Off

On/Off output is very simple: it turns the output on or off according to

the control signal of the On/Off control.

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Watlow Electric ANAFAZE SYSTEM 32 Guida Utente Pagina 70