Burkert Type 8605 - Manual (Page 27)

27
Configuration
→
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.
Maximum flow rate
→
Set the maximum coil current I
2
(AdJ = HI mA) via the arrow keys so that the maximum flow rate is just
achieved.
→
Increase the coil current with the arrow key until the maximum flow rate is reached and a further increase in
the current does not result in a further increase in flow rate.
→
Reduce the coil current with the arrow key until the flow rate starts to drop noticeably again and confirm this
value with the
-key as the maximum coil current I
2
(AdJ = HI mA).
Indicative current values, depending on the valve type
For the current values of the start of opening and the maximum flow rate there are default values for each valve type
stored in the menu. These values are only indicated values depending on the nominal size of the valve and pressure
ratio.
In the menu item ADJ the valve must be set to the nominal size of the valve and the current pressure.
For all direct-acting proportional valves (i. e. all types with the exception of Type 6223), the current value I
1
for the
start of opening drops with increasing inlet pressure; with an increasing pressure drop through the valve, the value
I
2
at which the maximum flow rate is achieved also decreases.
For the pilot-controlled valve, Type 6223, the current value for the start of opening increase with increasing inlet
pressure; with an increasing pressure drop through the valve, the value I
2
also increases.
9.3.5. dELY (Delay) - Ramp function
The ramp time for attenuating sudden changes in the input signal can be entered separately for changes upwards
and downwards.
• HI [s] - Ramp for a positive signal jump
The time indicated in seconds (0.1 to 10.0 s) relates to a change in set point from 0 % to 100 %.
• LO [s] - Ramp for a negative signal jump
The time indicated in seconds (0.1 to 10.0 s) relates to a change in set point from 100 % to 0 %.
With smaller changes in the input signal, the delay time corresponds to the set value multiplied by the size of the
change in percent. For example, with a sudden change from 20 % to 70 %, it corresponds to exactly half the
value set under HI in seconds. With a setting value of 0.0 s, the respective ramp function is deactivated.
english
Type 8605