Adj (adjust) - adaptation of the coil current – Burkert Type 8605 User Manual
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Configuration
• 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.
9.3.4.
AdJ (Adjust) - Adaptation 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 corresponds to the nominal and actual value of
0 %. The setting range depends on the device version being used.
• Upper current limit - HI [mA]
Current value at which the valve just reaches the maximum flow rate. An increase in the coil current above the
upper value does not result in any noticeable increase in the flow rate. This value corresponds to the nominal
and actual value of 100 %. The setting range depends on the device version being used.
Current values outside the working range are irrelevant for a control.
The range of the input standard signal (e. g.
.
• For a given valve type (coil version), the working range depends on the nominal size of the valve and on the
pressure ratios (inlet and return pressure) in the system. The setting has to be made under typical operating
conditions.
Figure 20:
AdJ (Adjust) - Adaptation of the coil current
• A flow indicator is necessary for the setting of the working range. Determine the start and the achievement
of the maximum flow rate with this indicator.
• The absolute precision of the flow indicator is not crucial!
SETTING THE MINIMUM AND MAXIMUM COIL CURRENT
Start of flow
→
Set the minimum coil current I
1
(AdJ = LO mA) via the arrow keys so that the valve just starts to open.
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Type 8605