Red Lion PAX2C - Manual (Page 35)

35
On/Off
Hysteresis
On/Off
Deadband
F1 F2
P
D
Pro
N O
Pro
P i d
Pid
O N O F
HYSt
0 . 2
°F
dEAd
0 . 0
°F
pid p
arameTers
: O
n
/O
ff
p
arameTers
(ONOF)
ON/OFF HYSTERESIS
0 to 50.0 units
The On/Off Hysteresis property is used to eliminate output chatter
by separating the on and off points of the output(s) when performing
on/off control. The hysteresis value is centered around the setpoint,
that is, the transition points of the output will be offset above and
below the setpoint by half of the On/Off Hysteresis value. This value
effects outputs programmed for Heat or Cool. During auto-tune, the controller
cycles the process through 4 on/off cycles, so it is important to set the On-Off
Hysteresis to an appropriate value before initializing auto-tune.
ON/OFF DEADBAND
-199.9 to 999.9 units
The On-Off Deadband property provides a means of offsetting the
on-points of heat and cool outputs programmed for on/off operation.
This results in a deadband if the value is positive, and overlap if the
value is negative. When determining the actual transition points of
the outputs, the On/Off Hysteresis value must also be taken into
consideration.
HYSt
0.2
dEAd
0.0