Watlow F4T • 120 • Chapter 5 Function Reference
Derivative [1 to 5]
Set how aggressively the derivative part of the PID algorithm acts. Derivative acts to prevent
the process value from changing too quickly. It can help minimize the effect of transient pro-
cess disturbances, but too much derivative can make the process slow to adjust to changes. A
greater Time Derivative setting yields a greater power adjustment for a given change.
This parameter applies when either Heat Algorithm or Cool Algorithm or both are set to PID.
This parameter is set automatically by autotuning the loop and when TRU-TUNE+ is enabled.
Range: 0 to 99,999 seconds
Minimum Set Point
Set the low end of the range for the Set Point. The Set Point and Idle Set Point cannot be set
below this value.
Range: -99,999 to 99,999 ºF or units
-55,573 to 55,537 ºC
Maximum Set Point
Set the high end of the range for the Set Point. The Set Point and Idle Set Point cannot be set
above this value.
Range: -99,999 to 99,999 ºF or units
-55,573 to 55,537 ºC
Minimum Manual Power
Set the low end of the range for the Manual Power.
Range: -100 to 100.0%
Maximum Manual Power
Set the high end of the range for the Manual Power. The Manual Power cannot be set outside
of the ranges below.
Range: -100 to 100.0%
Ramp Action
Choose the conditions under which the loop ramps its set point. When the set point ramps,
it starts at the Process Value and changes gradually to the Closed-Loop Set Point rather than
abruptly changing values.
Options:
• Off: the loop controls to the Set Point immediately
• Startup: each time the controller is powered up, the loop ramps the set point. At all
other times abrupt changes to the Set Point are allowed
• Set Point: upon powering up the Set Point immediately resumes its last value, but the
loop ramps the set point each time the Set Point is changed
• Both: the loop ramps the set point each time the controller is powered up or the Set
Point is changed
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