Burkert 8605 KK Instructions De Service page 32

8.3.3 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, and
• 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.
Illustration 8-7: VAdJ (Valve adjust) - Fine tuning of valve frequency
nOTe!
• 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.
8.3.4 adJ (adjust) - adaption of the coil current
The working range of a proportional valve is defined by the coil current.
• lower current limit - lO [ma]
Current value at which the valve just starts to open. This value corre-
sponds to the nominal and actual value of 0 %. The setting range de-
pends on the device version being used.
• upper current limit - hi [ma]
Current value at which the valve just reaches the maximum flow rate. An
2 - 8605