Voith WSR-D16212, Instruction Manual

Page: 17 / 25

Instruction Manual
Voith Turbo Way Valve WSR-D16212
2003 / 07 aie Voith Turbo GmbH & Co. KG Page: 17 / 24
918 3626 018870 en D – 74564 Crailsheim Version: 3.0
With potentiometers X0 and X1, an effective stroke of the piston from a hydraulic cylinder
can be allocated to setpoint 4..20 mA.
The regulating ranges of the potentiometers are defined differently:
Adjusting range X0: +/- 5 %
Adjusting range X1: +/- 5 %
The data refer to the falling signal of the position feedback 20..4 mA
≈
0..100 % stroke.
Stroke setting 0 %:
•
Predefine setpoint w = 4.0 mA with a power source.
•
Set 0 % position using potentiometer X0 and observe
position x and the actual value remote indication.
Should the actual value remote indication increase permanently, i.e. greater than 4
mA when adjusting the potentiometer X0 counterclockwise, the lower mechanical
stop (on valve adjustment usually the valve seat) is reached and the regulating range
exceeded.
In order to reach the "closed position" of a valve safely at a setpoint of 4 mA, even at
thermal linear expansion or drifting of a signal, the stroke may also be adjusted at a
setpoint of e.g. 4.5 mA.
Effective direction of X0:
The piston moves towards 100 % by turning
the potentiometer clockwise.
Stroke setting 100 %:
•
Predefine setpoint w = 20.0 mA with a power source.
•
Set 100 % position using potentiometer X1 and observe position s and the actual value
remote indication.
Should the actual value remote indication increase permanently, i.e. less than 4 mA
when adjusting potentiometer X1 clockwise, the upper mechanical stop is reached
and the regulating range exceeded.
Effective direction of X1:
The piston moves towards 100 % by turning
the potentiometer clockwise.
6.2.2 Setting the proportional gain
The control parameters on the way valve are preset by the factory.
After mounting on a cylinder, the control parameters need to be adapted on the jobsite
under real operating conditions.
•
Predefine setpoint step-change from 18
→
6 mA.
•
Observe the time-dependent course of the actual value x in the control room.
•
Vary the gain with potentiometer KP until the time-dependent course of the actual value
corresponds to characteristic curve 2 in Fig. 4.