Adj (Adjust) - Adaptation Of The Coil Current - Burkert Typ 8605 Manuel D'utilisation

9.3.4. adJ (adjust) - adaptation
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.
0 to 10 V) is therefore set to the working range of the coil current (see chapter 7.Configuration and Function).
• 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
→
Start with a current value at which the valve is still reliably closed and increase the coil current with the arrow
key until the flow indicator detects a flow for the first time.
→
Reduce the coil current by a few mA with the key
→
Confirm the minimum coil current I
28
(AdJ = LO mA) via the arrow keys so that the valve just starts to open.
1
with the
1
english
of the coil current
until the valve is reliably closed again.
-key.
Type 8605
Configuration