W.E.S.T. Elektronik PAM-195-P-S3, Техническая документация инструкция

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Page 29 of 35 PAM-195-P-S3 05.06.2020
5.6 Parameters of the power stage
5.6.1 CURRENT (Nominal output current)
Command Parameters Unit Group
CURRENT X x= 500… 2600 mA
STD
The nominal solenoid current is set with this parameter. The DITHER and also the MIN/MAX parameter al-
ways refer to the selected current range.
5.6.2 DAMPL (Dither amplitude)
5.6.3 DFREQ (Dither frequency)
Command Parameters Unit Group
DAMPL X
DFREQ X x= 0… 3000
x= 60… 400 0,01 %
Hz
STD
The dither
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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.
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.