Festo 1548004, Инструкции по ремонту

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52 / 55 Festo 7DFPIb_en
Fault symptom Operating
mode Possible cause Remedial measure(s)
Piston rod does
not move to correct
target position
following successful
initialisation
Normal
operation
Displacement encoder outside
measuring range
Switch off compressed air supply. Check analogue
feedback while moving piston rod by hand. If feedback
shows no change while piston rod is being moved by
hand -> repair or replace.
Replace displacement encoder; see section
4.5.1
„Replacing the displacement encoder“ .
Replace displacement encoder; see section 4.7.1
„Replacing the displacement encoder“ .
3-pin plug connected
incorrectly
Switch blue and brown wires. Dismantle 3-pin plug; see
section
4.5 „Repair steps for the end cap module“ / 4.7
„Repair steps for the end cap module“ .
5.2 DFPI-ND2P-G2
Fault symptom Possible cause Remedial measure(s)
Piston rod does not
retract or advance
Problem with compressed air
supply
Check compressed air supply and pneumatic connections, and correct if
necessary.
Pneumatic tubing kinked
Load too high
Reduce load.
Piston rod jamming due to high
transverse forces
Reduce transverse forces.
Piston rod not moving
to setpoint position
Displacement encoder faulty
Measure resistance between pin 1 and pin 2 on 3-pin plug while moving
piston rod by hand. Dismantle 3-pin plug; see section
4.5 „Repair steps
for the end cap module“ / 4.7 „Repair steps for the end cap module“ .
Problem with 3-pin plug
connection to displacement
encoder Check electrical connection of 3-pin plug. Dismantle 3-pin plug; see
section
4.5 „Repair steps for the end cap module“ / 4.7 „Repair steps for
the end cap module“ .
Piston rod not
reaching end position
Displacement encoder faulty
Displacement encoder outside
measuring range Measure resistance between pin 1 and pin 2 on 3-pin plug while moving
piston rod by hand. Dismantle 3-pin plug; see section
4.5 „Repair steps
for the end cap module“ / 4.7 „Repair steps for the end cap module“ .
Compressed air supply too low Increase compressed air supply.
Load too high Reduce load.
Transverse forces on piston rod
too high
Reduce transverse forces on piston rod.
Friction changed by vibration,
impacts or shocks
Eliminate cause of vibrations, impacts and shocks.
Displacement encoder shifted
by vibrations, impacts or
shocks
Eliminate cause of vibrations, impacts and shocks.
Seal not seated correctly/faulty
seal on piston
Check that seal is seated correctly/replace faulty seal.
No holding force in
intermediate positions
Seal not seated correctly/faulty
seal on piston
Check that seal is seated correctly/replace faulty seal.
Piston rod moving too
slow/fast
Compressed air supply too
high/low
Increase/reduce compressed air supply.
Piston rod suddenly
advances/retracts
more slowly Pneumatic components of
intermediate cap/bearing cap
leaking
Fix leaks in pneumatic components of bearing cap/end cap.