Watlow F4T User Manual

Watlow F4T • 105 • Chapter 5 Function Reference
Remote Set Point Type
Choose whether the remote set point received at input RSP overrides the Manual Power or
the Set Point when the remote set point feature is enabled by either the Remote Set Point
parameter or the REN input.
Options:
• Manual: the remote set point is in percent power where -100% is full cooling, 0% is no
output and 100% is full heating and overrides the Manual Power when enabled
• Auto: the remote set point is in the units of the PV input and overrides the Set Point
when enabled
Use Remote Set Point Active Level
Choose the signal value at the REN receiver which causes the loop to use the remote set
point value received at RSP instead of the Set Point or Manual Power setting. See Remote Set
Point Type.
Options:
• High: the remote set point is used when the signal is on
• Low: the remote set point is used when the signal is off
Set Point
Set the desired process value. When Control Mode is Auto, the loop adjusts its outputs to
make the process value (input IN) equal to this setting.
Range: Minimum Set Point to Maximum Set Point
Manual Power
Set the desired output value for HT, CL and PWR outputs when Control Mode is Manual.
Range: Minimum Manual Power to Maximum Manual Power
Autotune Set Point
Set the percentage of the Set Point at which the loop autotunes. Because autotuning drives
the process value above and below the set point, in some applications it may be necessary or
preferable to autotune at a set point below or above the normal set point.
This parameter applies when either Heat Algorithm or Cool Algorithm or both are set to PID
and autotuning is performed.
Range: 50.0 to 200.0%
Autotune Aggressiveness
Choose the desired responsiveness for PID control after autotuning. This parameter applies
when either Heat Algorithm or Cool Algorithm or both are set to PID and autotuning is per-
formed.
Options:
• Critical: balance a rapid response with minimal overshoot
• Over: bring the process value to the set point with minimal overshoot
• Under: bring the process value to the set point quickly tolerating overshoot

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