Technical documentation - W.E.ST. Elektronik GmbH

SENS (sensor monitoring)
W.E.ST. Elektronik GmbH
Kommando Parameter Vorgabe Einheit
sens x x= ON|OFF ON -
The sensor monitoring can be activated. The output current to the solenoids and the input signal (in case
of 4… 20 mA) are monitored.
SOLENOIDS (number of solenoids)
Commands Parameter Defaults Units
solenoids x
x= 1|2 2 -
If this module is used with a throttle or pressure valve solenoid A should be used only.
This command is used to switch off the internal monitoring of solenoid B.
Solenoids = 1 - throttle or pressure valve
Solenoids = 2 - directional valves
CURRENT (range of the output current)
Kommando Parameter Vorgabe Einheit
current x x= 0, 1, 2 0 -
Selection of the output current range: 0 = 1,0 A range, 1 = 1,6 A range and 2 = 2,6 A range.
If modus “RCURR” = ON, then this command is not active.
The current range select done automatically.
DFREQ / DAMPL (dither frequency, dither amplitude)
Kommando Parameter Vorgabe Einheit
dfreq x
dampl x
x= 60… 400
x= 0… 1800
120
400
Hz
0,01%
Dither amplitude. Typical values between 500 and 1200 (good experience were made with 700) 2 .
Dither frequency. Typical values are between 60 and 200 (good experience were made with 125).
The dither amplitude and the dither frequency are adjustable. With the dither setting the valve hysteresis
can be reduced clearly. The dates for the dither setting can often be taken from the valve dates.
The dither amplitude should be as high as possible, but the drive should not vibrate.
Caution: Too high dither amplitude can lead to an increased attrition (the friction in the
valve reduces a short start phase).
Caution: If the PWM frequency is lower than 500 Hz, the dither amplitude should be set to
zero. In this case the low PWM frequency is used to reduce the valve hysteresis
2
The current loop compensator is improved in software version 14. The amplitude has to be reduced again older versions.
Seite 19 von 22 12.03.2008