Watlow F4T User Manual

Watlow F4T • 103 • Chapter 5 Function Reference
Cool Proportional Band Outer Loop [1 to 5]
Set the proportional relationship between cool power (%) and the process value (typically
temperature). This setting determines how big a correction the proportional part of the PID
control algorithm makes when the process value deviates from set point. A smaller propor-
tional band yields a larger power adjustment for a given deviation from set point.
This parameter applies only when Cool Algorithm is set to PID. This parameter is set automat-
ically by autotuning the loop.
Range: 3 to 99,999 ºF or units
1 to 55,555 ºC
Integral Outer Loop [1 to 5]
Set how aggressively the integral part of the PID algorithm acts. Integral acts to drive the
process value to set point by steadily adjusting the output whenever the process value devi-
ates from the set point. A smaller Integral setting yields a larger power adjustment for a giv-
en deviation from set point over a given time.
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.
Range: 0 to 99,999 seconds per repeat
Derivative Outer Loop [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
larger 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.
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.
Range: -100.0 to 100.0%

Watlow F4T Specifications

General

Inputs	Thermocouple, RTD, mA, V
Outputs	Relay, SSR, mA, V
Communication	Ethernet, Modbus RTU
Data Logging	Yes
Certifications	CE, UL, cUL, RoHS
Control Modes	PID, On/Off
Power Supply	100 to 240 VAC
Operating Temperature	0 to 50°C
Enclosure Rating	IP65
Display	4.3 in. (109 mm) color touch panel LCD
Control Loops	Up to 4