158
Position-proportional Control Section 4-24
Position-proportional Dead Band and Open/Close Hysteresis
The interval during which the valve output is held (for the ON and OFF switch-
ing points for the open output and closed output) is set by the Position Propor-
tional Dead Band parameter, and the hysteresis is set by the Open/Close
Hysteresis parameter.
PV Dead Band
When the process value (PV) is within the PV dead band, control is executed
as if the process value is equal to the set point for the current bank to prevent
unnecessary outputs when the process value is in the vicinity of the set point.
Valve Opening Monitor
Valve opening can be monitored by connecting a potentiometer. The motor
must be calibrated after the potentiometer is connected.
Note If no potentiometer is connected or if a potentiometer input error oc-
curs, "---- " will be displayed.
With the E5AN/EN-H, valve opening can also be monitored on the PV/SP/MV
(Valve Opening) Screen.
Parameter Setting range Unit Default
Position Proportional
Dead Band
Position proportional (closed): 0.1 to
10.0
%4.0
Position proportional (floating): 0.1 to
10.0
2.0
Open/Close Hysteresis 0.1 to 20.0 % 0.8
0
Dead band
−100%
OFF
ON
100%
MV − Valve opening
Open/close positional-
proportional hysteresis
Parameter Setting range Unit Default
PV Dead Band 0 to 32400 EU 0.0
PV dead band
SP
Parameter Setting range Unit Default
Valve Opening Monitor −10.0 to 110.0 % ---
To Next Page
Loading...
Need help?
General
