Festo 1548004, Repair Instructions

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49 / 55 Festo 7DFPIb_en
5 Troubleshooting
This chapter provides concise information about various fault symptoms, their possible causes and how to fix them.
5.1 DFPI-ND2P-C1V-…-A
Fault symptom Operating
mode Possible cause Remedial measure(s)
Piston rod does not
retract or advance
Initialisation
No compressed air supply or
problem with the compressed
air supply
Check compressed air supply and pneumatic ports.
Flow control valves D2 and D4
fully closed
Open flow control valves D2 and D4.
Load too high Reduce load on piston rod.
Normal
operation
Dirt in valve block/valve faulty
Replace valve block; see section 4.5.4 „Replacing the
valve block“ .
Replace valve block; see section 4.7.3 „Replacing the
valve block“ .
Piston rod jamming due to high
transverse forces
Reduce transverse forces.
Piston rod not moving
following successful
initialisation
Initialisation
Problem with electrical
connection on valve block Check electrical connections, connect correctly if
connected wrongly.
Piston rod moves too
fast
Initialisation
Compressed air supply too high Reduce compressed air supply.
Flow control valves D2 and D4
fully open
Adjust speed of actuator using flow control valves D2
and D4.
Piston rod moves too
slowly
Initialisation
Compressed air supply too low Increase compressed air supply.
Flow control valves D2 and D4
closed Adjust speed of actuator using flow control valves D2
and D4.
Piston rod does not
reach end position
Initialisation stops
Initialisation/
normal
operation
Seal not seated correctly/faulty
seal on piston
Check that seal is seated correctly/replace faulty seal.