Watlow F4T User Manual

Watlow F4T • 189 • Chapter 5 Function Reference
Signals
Direction
Label Type Function
Receivers
A Analog %
Power output from one control loop that requires the com-
pressor
B Analog %
Power output from a second control loop that requires the
compressor
Transmitter OUT Digital On indicates the compressor should be running
Function
To operate a compressor to meet demands for one or two control loops while protecting it
from excessive cycling, set Function to Compressor Control.
Input A Turn On
Set the value of the signal at receiver A that indicates demand for the compressor to turn on.
When A drops to or below this value and the Minimum Off Time condition has been met, the
function turns on the output to the compressor.
Range: -100.0 to 100.0%
Input A Turn Off
Set the value of the signal at receiver A that indicates there is no demand for the compressor
to be on. When A rises to or above this value and the Minimum On Time condition has been
met, the function turns off the output to the compressor.
Range: -100.0 to 100.0%
Input B Turn On
Set the value of the signal at receiver B that indicates demand for the compressor to turn on.
When B drops to or below this value and the Minimum Off Time condition has been met, the
function turns on the output to the compressor.
Range: -100.0 to 100.0%
Input B Turn Off
Set the value of the signal at receiver B that indicates there is no demand for the compressor
to be on. When B rises to or above this value and the Minimum On Time condition has been
met, the function turns off the output to the compressor.
Range: -100.0 to 100.0%
Minimum On Time
Set the minimum amount of time the compressor must be on before it can be turned off
again.
Range: 0 to 9,999 seconds
Minimum Off Time
Set the minimum amount of time the compressor is kept off before it can be turned on again.
Range: 0 to 9,999 seconds

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