Yokogawa YVP20S - Manual (Page 130)

14-4
<Toc> <Ind> <14. DIAGNOSTIC SERVICES>
IM 21B04C50-01E
(2) Measured Gain
The Measured Gain is measured by the Auto tuning function. The unit for this parameter is
rad/mA.
(3) Valve TC
This parameter describes the response speed of control valve system. The units for this
parameter are seconds. This parameter is measured by the Auto Tuning function. The
parameter indicates how fast the control relay can drive the air actuator.
(4) Valve Hysteresis
This parameter describes the hysteresis of the control valve. The unit for this parameter is
%. This parameter is measured by the Auto Tuning function.
(5) Valve Slip Width
This parameter describes the slip width of control valve. The unit for this parameter is %.
The stem of the control valve will make an abrupt movement when the pneumatic actuator
breaks the friction of the valve packing. Slip width is the value of abrupt movement of the
stem.
(6) Measured Exhaust Pressure
This parameter describes air pressure. This parameter is available only in the AP option
(with pressure sensor). The units for this parameter are determined by unit index of Spring
Range. The Measured Exhaust Pressure is measured by the Auto tuning function. It is the
value of actuator pressure when the valve is at the 0% mechanical stop.
The parameter is used for diagnostics only. It is not used for tuning or control.
(7) Measured Supply Pressure
This parameter describes supply pressure. The units for this parameter are determined by
unit index of Spring Range. This parameter is available only in the AP option. The Measured
Supply Pressure is measured by the Auto tuning function. It is the value of actuator pres-
sure when the valve is at the 100% mechanical stop.
The parameter is used for diagnostic only. It is not used for tuning or control.
(8) Measured Spring Range- Upper
This parameter describes upper range value of the control valve spring range. The units for
this parameter are determined by unit index of Spring Range. This parameter is available
only in the AP option. The Measured Spring Range Upper is measured by the Auto tuning
function.
The parameter is used for diagnostic only. It is not used for tuning or control.
(9) Measured Spring Range- Lower
This parameter is lower range value of the control valve spring range. The units for this
parameter are determined by unit index of Spring Range. This parameter is available only in
the AP option. The Measured Spring Range Lower is measured by the Auto tuning function.
This parameter is used for diagnostics only. It is not used for tuning or control.