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Multi-Input/Output Device
Troubleshooting and Diagnosis
Problem
Auxiliary valve not
controlled
5.5
Initialization Run
Message
Error before start
Error while running
Cause
Solution
The reference value
Check reference value
specified by the
and correct it, if
DO function block has
necessary.
the status BAD or
UNCERTAIN.
Transducer block is in
Set transducer block
"Out of service" mode.
to "Auto" mode.
Hardware or lead
Check diagnostic
error.
messages.
Simulation is switched
Switch OFF
ON in function block.
simulation.
Cause
Valve is actuating.
Lead breakage or short circuit at
valve or sensor.
Valve is not in final position.
Resource block is in "Out of
Service" mode.
The PFCs have displayed an
unexpected valve position. The
expected position is open -
intermediate - closed and vice
versa.
Breakaway time is longer than
1 min.
Auxiliary power too low.
■
Friction too high.
■
Drive or pilot valve defective.
■
System pressure too high.
■
Transit time is longer than 3 min.
Auxiliary power too low.
■
Friction too low.
■
Drive or pilot valve defective.
■
The lead or short circuit
monitoring has detected an error.
Further Information
See chapter 4.5.10
See chapter 5.4
See chapter 5.4
See chapter 3.2.4
Resource Block
parameters, see
chapter 6
Solution
Start initialization run again as
soon as the valve has reached
the set position.
Check wiring of sensors and
valve.
Check PFCs.
■
Check auxiliary power.
■
Check drive.
■
Set resource block into "Auto"
mode.
Check PFCs and contacts.
Check auxiliary power.
■
Check friction.
■
Check drive and pilot valve.
■
Checks system pressure.
■
Check auxiliary power.
■
Check friction.
■
Check drive and pilot valve.
■
Check wiring of sensors and
valve.
For more information, see
chapter 5.1 and see chapter
4.6.2.
53
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