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5.6
Parameters of the power stage
5.6.1 CURRENT (Nominal 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 DAMPL (Dither amplitude)
5.6.3 DFREQ (Dither frequency)
Command
DAMPL
DFREQ
2
The dither
can be defined freely with this command. Different amplitudes or frequencies may be required de-
pending on the respective valve. The dither amplitude is defined in % of the nominal current (see: CURRENT
command). Depending on internal calculations the setting at higher frequencies is only possible in steps. Al-
ways the next higher step is chosen.
CAUTION: The PPWM and IPWM parameters influence the effect of the dither setting. These param-
eters should not be changed again after the dither has been optimized.
CAUTION: If the PWM frequency is less than 500 Hz, the dither amplitude should be set to zero.
5.6.4 PWM (PWM frequency)
Command
PWM
The frequency can be changed in the defined steps (61 Hz, 72 Hz, 85 Hz, 100 Hz, 120 Hz, 150 Hz, 200 Hz,
269 Hz, 372 Hz, 488 Hz, 624 Hz, 781 Hz, 976 Hz, 1201 Hz, 1420 Hz, 1562 Hz, 1736 Hz, 1953 Hz, 2232 Hz
and 2604 Hz). The optimum frequency depends on the valve.
Attention: The PPWM and IPWM parameters should be adapted when using low PWM frequencies
because of the longer dead times which forces a reduced stability of the closed loop control.
2
The DITHER is a superimposed signal to reduce the hysteresis. This function is defined by the amplitude and frequency.
The DITHER frequency should not be confused with the PWM frequency. In some proportional valve documentations a
mistake is done by the definition of the DITHER / PWM frequency. It is recognizable by missing information about the
DITHER amplitude.
Page 29 of 33
Parameters
x
x= 500... 2600
Parameters
X
x= 0... 3000
X
x= 60... 400
Parameters
X
x= 61... 2604
Unit
mA
Unit
0.01 %
Hz
Unit
Hz
PAM-198-P
Group
PAM
Group
PAM
Group
PAM
05.06.2020
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