Watlow F4T

Watlow F4T • 114 • Chapter 5 Function Reference
• PID: PID control sets the HT and PWR outputs to a value from 0% to 100%
Cool Algorithm
Set the method the control loop uses to set cool (CL) and power (PWR) outputs. For a given
application, on-off switches the output less frequently than PID, whereas PID maintains the
process value with much less cycling around set point than on-off.
For applications other than temperature control, use the cool output when there is a direct
relationship between the input and the output, that is when the output should be increased
as the input rises above set point.
Options:
• On/Off: On-Off control sets the CL and PWR outputs on (100% for CL and -100% for
PWR) or off (0%)
• PID: PID control sets the CL and PWR outputs to a value from no cooling 0% to full cool-
ing (100% for CL and -100% for PWR)