Burkert Type 8611 - Manual (Page 51)

51
FunctionsoftheConfigurationLevel
Ideal
working point
Frequency
f
τ
Pulse duty factor
f
hi
f
lO
High
frequency
Low
frequency
0 % 100 % 60 %
Figure 31: PWM frequency / pulse duty factor
note for easy setting of the pWM frequency
All Bürkert proportional valves with the corresponding PWM frequency are saved in the menu of the
eCONTROL Type 8611 and can be selected there.
The table with the PWM frequencies is available on the internet at www.burkert.com.
By setting the valve type, the two limit frequencies of the PWM control (f
hi
and f
lO
) are set. Depending on the
working point, the actual output frequency is in this range. The values allocated to the valve types were determined
empirically from the behavior of a large number of individual devices of the respective type.
For optimizing the control behavior, the pulse duty factor is limited depending on the valve type as there are no
significant changes in the flow-rate in the upper range of the pulse duty factor.
WaRNiNg!
danger due to malfunction if an incorrect valve type is selected!
Selecting the wrong valve type may result in damage at the valve and in malfunction.
• Ensure that you select the right valve type.
english
Type 8611