Watlow F4T User Manual

Watlow F4T • 96 • Chapter 5 Function Reference
Inner Loop Heat Algorithm
Set the method the control loop uses to set heat (HT) and power (PWR) outputs. For a given
application, on-off switches the output less frequently than PID, whereas PID maintains the
process value with much less cycling around set point than on-off.
For applications other than temperature control, use the heat output when there is an indi-
rect relationship between the input and the output, that is when the output should be in-
creased as the input drops below set point.
Options:
• Off: no heat output is calculated or applied to HT or PWR
• On/Off: On-Off control sets the HT and PWR to (100%) on, or off (0%)
• PID: PID control sets the HT and PWR outputs to a value from 0% to 100%
Inner Loop Cool Algorithm
Set the method the control loop uses to set cool (CL) and power (PWR) outputs. For a given
application, on-off switches the output less frequently than PID, whereas PID maintains the
process value with much less cycling around set point than on-off.
For applications other than temperature control, use the cool output when there is a direct
relationship between the input and the output, that is when the output should be increased
as the input rises above set point.

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