Burkert 8605 Series, Operating Instructions Manual, Page: 28 / 118

28
Configuration
adJ (adjust) - adaptation 9.3.4. 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.
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.
AdJ (Adjust) - Adaptation of the coil current Figure 20:
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.
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
→
until the valve is reliably closed again.
Confirm the minimum coil current I
→
1
with the -key.
english
Type 8605