Table of Contents
Advertisement
5.6 Power stage
5.6.1
CURRENT (Rated solenoid current)
Command
CURRENT
The nominal current (for 100% opening) of the solenoid is set here. Dither and also MIN/MAX always refer to
this current value.
5.6.2
DFREQ (Dither frequency)
5.6.3
DAMPL (Dither amplitude)
Command
DFREQ
DAMPL
2
The dither
can be defined with this commands. Different amplitudes or frequencies may be required
depending on the valve. The dither amplitude is defined in % (peak to peak value) of the nominal output cur-
rent (see: CURRENT command). The dither frequency is defined in Hz. Depending on the internal calcula-
tions, the frequency is adjustable in steps only.
CAUTION: The PPWM and IPWM parameters influence the effect of the dither setting. These
parameters should not be altered again after the dither has been optimized.
CAUTION: If the PWM frequency is less than 500 Hz, the dither amplitude DAMPL should be set to
zero.
2
The dither is a ripple signal which is superimposed on the current set point and is defined by the amplitude and fre-
quency: the dither frequency and the PWM frequency. The dither frequency should not be confused with the PWM fre-
quency.
In some documentations the PWM frequency is described as a dither. This can be recognized by the lack of the
dither amplitude.
Page 28 of 34
Parameters
X
x= 500... 2600
Parameters
X
x= 60... 400
X
x= 0... 3000
PQP-171-P
Unit
mA
Unit
Hz
0.01 %
Group
STD
Group
STD
05.06.2020
Advertisement
Table of Contents
