Burkert 8681 - Page 156

156
Maintenance, troubleshooting
Fault description Possible cause of the fault Troubleshooting
Feedback signal is "lost" in
system operation
Position in the limit range of the
feedbackeld
“6.8.1Feedbackelds(position
measuringsystem)”onpage28
Repeat the Teach procedure
(seechapter“20.1 Setting the position
measuringsystem(Teachprocedure)”)
Check the process valve end positions
during operation against the end posi-
tions in non-operative status of the
system.
Check the pressure supply.
Valve output 2/A1 cannot be
switchedowiththecontrol
Magnetic manual override is still
activated
Deactivate the manual override -
compare chapter “22.1 Magnetic
manualoverride”
Valve outputs cannot be
switchedobythecontrol
Mechanical manual override at
the solenoid valve is still activated
Deactivate the mechanical manual
overrides on the solenoid valves -
compare chapter “22.2 Mechanical
manualoverride”
Faults are signaled by
means of device status LED
/ Top LED
Possible causes may vary
depending on the version
Please read the corresponding descrip-
tions of the respective communication
variant in these operating instructions
(seechapter“21.2 Flashing pattern &
faultsignalling”)
No or faulty function of the
process valves
No electrical power supply or
communication for the control
head
Check the power supply and the
communicationsettings(alsoreferto
detailed descriptions of the respective
versionsintheseoperatinginstructions)
Noorinsucientpneumatic
supply of the control head
Check the pressure supply and ensure
thatsupplyissucient
Incorrect function of the
process valves
Confused pneumatic connection
lines
Check the correct pneumatic con-
nection of the control head to the
process valve
(foruiddiagramsseechapter“5.3.2
FluiddiagramsType8681–examples”
and the operating instructions of the
correspondingprocessvalves)
Valves not correctly connected on
electronic module
Check the correct electrical connection
of the solenoid valves - compare e.g.
“Fig.15:24VDCelectronicmodule”
Intheeventofanyundenedfaults,besuretocontacttheservicedepartmentofBürkert.
(seechapter“4.1Contactaddress”)
english
Control Head Type 8681