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39
Pneumatic Installation
Settings of the flow-rate or the control speed with the help of the flow restriction
screws:
For proper setting, it is advisable to turn the
two flow restriction screws initially into the minimum
flow-rate position.
The process valve will then initially move slowly so that you have more time to
find the optimum setting during a switching operation.
Minimising the flow rate:
Turn clockwise
Maximising the flow rate:
Turn counterclockwise
→
Open the housing following the instructions in chapter
“8 Opening and Closing the Housing”
→
Observing the safety guidelines, activate the respective valve location (V1, V2 or V3) to be set (either
using the system control (PC service programm or Bürkert Communicator) or the respective manual
overrides on the solenoid valve -
→
Turn the flow restriction screw "P" counterclockwise to set the required flow rate and therefore the
opening time for the process valve. (Tool: flat-blade screwdriver, width ≤ 3 mm).
→
Subsequently deactivate the respective valve location (V1, V2 or V3).
→
Turn the flow restriction screw "R" counterclockwise to set the required flow rate and therefore the
closing time for the process valve.
Flow restriction screw
Exhaust air R
Flow restriction screw
Intake air P
Red hand lever of the
mechanical manual
override:
Hand lever position:
left: 0
right: 1
Fig. 13: Flow restriction screws and mechanical manual override of the solenoid valves
NOTE!
To avoid unintentional switching of the process valve:
• Makes sure that all manual overrides have been deactivated (hand lever all the way left, as pictured)
after the setting work has been completed!
→
If no further installation work is required, close the housing following the instructions in chapter
Opening and Closing the Housing”
.
If no system status is available during setting, readjust the system under system operation conditions
if necessary.
Observe the safety guidelines during this! See chapter
“3 Basic Safety Instructions” on page
english
Control Head Type 8681
Summary of Contents for 8681
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