Owner's manual

Fault Possible Cause Solution
Unstable behavior,
position control circuit
oscillates
Autostart incomplete,
therefore, control
parameters not suitable
Perform a complete Autostart, see “Menu 2: Autostart”
Small actuator volume but
high air capacity
Increase damping at pneumatic output, see
“Menu 8: Manual Setting of Valve Position”
Friction on valve packing
too great
Loosen packing gland slightly or replace
IP module or Pneumatic
amplifier defective
Change module
Actuator reacts too
sluggish
Air capacity insufficient Attach booster
Damping set too high Reduce damping at pneumatic output, see
“Menu 8: Manual Setting of Valve Position”
Positioning time T63 set too
high
Reduce positioning time, see
“Menu 6: Parameter for Position Controller”
No communication
possible
Input voltage too low Eliminate voltage drop
Faulty protocol,
communicator and device
type do not match
Check configuration of devices
Wrong electronics unit Change device
For tuning controller parameters, see “Menu 6: Parameter for Position Controller”.
Page 65
Safety Requirements
August 2014 POS-UM-00009-EN-02