Watlow D4T Data Logger
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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
