EP100 Master Instruction
17
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D00002-C-04
9 DIAGNOSIS
Fault
Possible cause
Beseitigung
Actuator does not react
to existing input signal or
to changes of input signal
Pneum. connections were interchanged
Check pneum. connections,
see page 10
Electric connections were interchanged
Check electric connections,
see page 11
Wrong setting of zero and span
Check, see page 15
IP module or pneumatic part defective
Carry out Pneumatic Test,
possibly change part, see page 19
Direction of rotation interchanged
Change direction of rotation
Output pressure does not reach
full capacity
Supply air capacity insufficient
Check air supply
IP module defect
Carry out Pneumatic Test, possibly
change module, see page 19
Filter in air supply connection plugged
Exchange filter, see page 18
Actuator moves to end position
Positioner mounted on wrong side or
2 set faulty (
R/L
)
Check mounting side as per table
page 13
Pneumatik test still active (switch 8 = “II”)
Return switch 8 to “I”, see page 16
Pneumatic connections were
interchanged (double-acting version)
Check connections, see page 10
Unstable behaviour,
position control circuit oscillates
Gain too high
Reduce gain, see page 15
Friction on valve packing too great
Loosen packing gland slightly or
replace
Piston actuator:
Friction at cylinder too great
Reduce gain, see page 15
Stroke range cannot be set
Positioner does not fully decompose
pressure
Check air supply (max. 6 bar)
Check gain, see page 15
Carry out pneumatic test
(switch 8 = “II”),
see page 16
Pneumatic test is without effect
No air supply
Connect air supply
No input signal
Connect input signal
IP module is not connected, or
IP module or a pneumatic part defective
Connect IP module, or
exchange part (workshop)
