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HYS Hysteresis: Hysteresis is that area around the main
setpoint where the output does not change condition.
That area or deadband is intended to eliminate relay
chatter at setpoint for On/Off control applications. The
wider the Hysteresis, the longer it takes for the con-
troller to change output condition. The narrower the
Hysteresis, the less time the controller takes to change
output condition. When the Hysteresis is narrow, the
On/Off control is more accurate but the wear on the
output relay is increased. Enter a value which is small
enough to meet the control tolerance of the application
but large enough to eliminate relay chatter.
Setting range: 0 to 50% of FS, set in E.U. for output #1.
Hysteresis for On/Off action for dual outputs (heating
and cooling) is fixed at 0.5% of FS.
TC2 Cycle Time (Output #2) The Cycle Time for output #2 is
similar in function to Cycle Time for output #1. Output
#2 is the cooling side of a heat/cool PXW controller.
Enter a value that is based on the limitations of your
controller’s output type.
Setting Range: 1 to 150 secs.
Not indicated without the control output #2 option
For current output: Set to 0 (normally not indicated)
Cool Proportional Band Coefficient for Cooling: The
Proportional Band Coefficient for Cooling is a multiplier
for the proportional band on the cooling side of a
heat/cool controller. It varies the width of the propor-
tional band on the cooling side. A large value would
establish a larger proportional band for more powerful
cooling loads. A small value would establish a smaller
proportional band for less powerful cooling loads.
Enter a value based on the power of your cooling load.
Setting Range: 0.0 to 100.0
Not indicated without control output #2 option.
Set to “0” for On/Off control.
db Deadband/Overlap: The Deadband/Overlap is that per-
centage of the heating side of the proportional band
where the heating (output #1) and the cooling (output
#2) outputs are separated by a Deadband or where
they Overlap on a heat/cool controller. A value greater
than zero establishes a Deadband area where neither
the heating nor cooling outputs are energized, for more
powerful heating and cooling loads. A value less than
zero establishes an Overlap area where both the heat-
ing and cooling outputs are energized at the same
time, for less powerful heating and cooling loads. Enter
a value based on the power of your heating and cool-
ing loads as well as the application’s efficiency in
maintaining tight heat/cool control.
Setting range: -50.0 to 50.0% of the heating proportion-
al band.
Not indicated without control output #2 option
bAL Balance: Balance is used to pre-position the propor-
tional band with respect to setpoint. With Balance (MV
Offset) set at 50% the proportional band will be cen-
tered around setpoint. To move the band left or right,
decrease or increase the balance setting respectively.
Setting range: 0-100%
Ar Anti-Reset Wind-up: Anti-Reset is used to limit the
range where integration occurs. This helps in stabiliz-
ing a system. With Anti-Reset at 100%, integration will
occur throughout the proportional band. With Anti-
Reset set to 90%, integration will occur at 90% of the
band above the setpoint and 90% of the band below
the setpoint. Autotuning automatically sets Ar.
Setting range: 0-100% of full scale, set in E.U.
P-n2 Input type: The Input Type is the type of sensor to be
used with the controller in sensing the process vari-
able. The Input Type must be correctly programmed
into the controller in order for the controller to perform
with the selected sensor type. Depending on the type
of sensor to be used, the controller comes in two mod-
els. One model accepts J, K, R, B, S, T, E, N thermo-
couples and RTDs (Pt100). The other model accepts 1-
5/0-5V DC and 4-20/0-20mA DC signals.
The current/voltage model comes with a 250Ω preci-
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