45
HYS
Hysteresis:
The 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 controller
to change output condition. The narrower the Hysteresis,
the less time the controller takes to change output con-
dition. 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 full scale, set in E.U.
Hysteresis for On/Off action on dual outputs (heating and
cooling) is fixed at 0.5% of full scale.
Output ON
Output ON
Output OFF
Output OFF
Setpoints
Narrow
Hystersis
Wide
Hystersis
