Watlow F4T User Manual

Watlow F4T • 119 • Chapter 5 Function Reference
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
Heat Proportional Band [1 to 5]
Set the proportional relationship between heat 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 Heat Algorithm is set to PID. This parameter is set automat-
ically by autotuning the loop and when TRU-TUNE+ is enabled.
Range: 1 to 99,999 ºF or units
1 to 55,555 ºC
Cool Proportional Band [1 to 5]
Set the proportional relationship between cool power (%) and the process value (typically tem-
perature). This setting determines how big a correction the proportional part of the PID con-
trol algorithm makes when the process value deviates from set point. A smaller proportional
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 automati-
cally by autotuning the loop and when TRU-TUNE+ is enabled.
Range: 3 to 99,999 ºF or units
1 to 55,555 ºC
Integral [1 to 5]
Set how aggressively the integral part of the PID algorithm acts. Integral acts to drive the pro-
cess value to set point by steadily adjusting the output whenever the process value deviates
from the set point. A smaller Time 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 and when TRU-TUNE+ is enabled.
Range: 0 to 99,999 seconds per repeat

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