Burkert Type 8605 User Manual download pdf (Page 25)

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.

• In the case of types 2871, 2873 and 2875 the PWM frequency must be adjusted in addition to selecting the

type. A table of PWM frequencies which are suitable for controlling the valve type can be found on the Bürk-

ert homepage: www.burkert.com → Type 8605.

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

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Burkert Type 8605 User Manual Page 25