Vadj (Valve Adjust) - Fine Tuning Of The Valve Frequency - Burkert Typ 8605 Manuel D'utilisation

Type 8605
Configuration
CauTion!
danger from wrong setting of the valve type.
If the selected valve type differs from the valve actually used whose coil has very different characteristics, the
function of the valve can be severely impaired. When using the flat spring valve, Type 2822, the input of a
wrong valve type can lead to irreparable device damage!
always
• set the valve type correctly. For this parameter, the value „----" (no valve) is set as default value in the
delivery condition. If no valve is selected, the coil remains de-energised.
The choice of valves depends on the device type being used
Due to the scatter of the valve types with respect to friction characteristics and the relationship between
sensitive control behavior and low hysteresis or low noise development and larger hysteresis, it can be
advisable to deviate from the recommended PWM frequencies (see also chapter 9.3.3.VAdJ (Valve adjust)
- Fine tuning of the valve frequency).
9.3.3. VadJ (Valve adjust) - fine tuning of the valve frequency
In the menu VAdJ, the two frequencies defined with the selection of the valve type can be varied within certain limits.
A reduction of the values is generally associated with:
• a reduction in the hysteresis of the valve characteristic,
• improved response sensitivity and
• an increased noise level.
If the frequencies are increased, the hysteresis increases and the response sensitivity becomes poorer. The control
becomes slower and the noise level decreases.
Figure 19:

VAdJ (Valve adjust) - Fine tuning of the valve frequency

• The following rule applies for the input of the frequency pairs: HI value > LO value
• In the menu item VALV, the HI and LO values are limited to an expedient range in relation to the valve
type. No normal control behaviour can be expected outside this range.
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