Watlow F4T • 101 • Chapter 5 Function Reference
Off Active Level
Choose the signal value at the OFF receiver which switches the loop's Control Mode to Off.
Options:
• High: the Control Mode is set to Off when the signal is on
• Low: the Control Mode is set to Off when the signal is off
PID Sets - Explained
This controller supports up to five heat/cool PID sets. This feature is extremely valuable if
the characteristics of your thermal system vary over its operating range. All PID sets can be
auto tuned or manually tuned and can also be configured to operate using any of the five sets
based on crossover points of the set point or process value. When the process or set point val-
ue crosses the crossover point, the PID set designated for that region of the operating range is
used to control the percent power being supplied to the load.
There is a -1° hysteresis for each crossover. A rising temperature will change PID sets at the
crossover value. A falling temperature will change PID sets at the crossover value -1°.
Number of PID Sets.
Set the number of PID sets that will be available.
Range: 1 to 5
PID Set Crossover
Select what will trigger the crossover to another PID set.
Options: Process, Set Point
PID Set 1 to 2 Crossover
Set the value that will trigger a change (crossover point) from PID set 1 to set 2, relative to
the selected source.
Range: -99,000 to 99,999
PID Set 2 to 3 Crossover
Set the value that will trigger a change (crossover point) from PID set 2 to set 3, relative to the
selected source.
Range: -99,000 to 99,999
PID Set 3 to 4 Crossover
Set the value that will trigger a change (crossover point) from PID set 3 to set 4, relative to the
selected source.
Range: -99,000 to 99,999
PID Set 4 to 5 Crossover
Set the value that will trigger a change (crossover point) from PID set 4 to set 5, relative to
the selected source.
Range: -99,000 to 99,999
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