Technical data

W.E.ST. Elektronik GmbH
Page 21 of 25 PAM-190-P-*-1021 01.12.2014
5.2.13 PWM (PWM frequency)
Command
Parameters
Unit
Group
PWM X
x= 60… 2650
Hz
STD
This parameter is entered in Hz. The optimum frequency depends on the valve.
CAUTION: the PPWM and PPWM parameters should be adjusted with low PWM frequencies
4
.
The PWM frequency can only be set in defined steps. This means that there are deviations between
the specified and the actual frequency. The next highest frequency step is always used.
5.2.14 PPWM (Solenoid current controller P element)
5.2.15 IPWM (Solenoid current controller I element)
Command
Parameters
Unit
Group
PPWM X
IPWM X
x= 0… 30
x= 1… 100
-
-
EXP
The PI current controllers for the solenoids are parameterized with these commands.
CAUTION: These parameters should not be changed without appropriate measurement capabili-
ties and experience.
If the PWM frequency is > 2500 Hz the dynamic response of the current controller can be increased.
Typical values are: PPWM = 7… 15 and IPWM = 20… 40.
If the PWM frequency is < 250 Hz the dynamic response of the current controller must be reduced.
Typical values are: PPWM = 1… 3 and IPWM = 40… 80.
4
Due to the longer dead times at low PWM frequencies the stability of the control circuit is reduced. Typical values are
then: PPWM = 1… 3 and IPWM = 40… 70.