Watlow F4T User Manual

Watlow F4T • 115 • Chapter 5 Function Reference
Dead Band
Set the offset between the set point and the heat and cool proportional bands. A positive
deadband can reduce overshoot upon power up without changing the responsiveness of the
system at other times and also prevents heating and cooling outputs from being on at the
same time. A negative deadband allows both the heat and cool outputs to be active around
the set point which can be of benefit when a process must be controlled near the ambient
temperature.
Range: -1,000.0 to 1,000.0 ºF or units
-555 to 555 ºC
On/Off Heat Hysteresis
Set how far below set point the process value must drop before the heat output turns on.
This parameter applies only when Heat Algorithm is set to On-Off.
Range: 3 to 99,999 ºF or units
1 to 55,555 ºC
On/Off Cool Hysteresis
Set how far above set point the process value must rise before the cool output turns on. This
parameter applies only when Cool Algorithm is set to On-Off.

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