Festo CMSH - Page 71

Festo — CMSH — 2021-10
Malfunctions
71
ID Message NAM
UR
1)
Possible cause Notes/remedies
1086 PST stopped: Too
long duration com-
pared to absolute
upper limit
2)
–
Increased friction with
drive or process valve
–
Set threshold value
exceeded
–
Low supply pressure
–
Increased resistance in the
compressed air lines
– Wear of the positioner
–
Service the drive or
process valve and replace
if necessary.
–
Check supply pressure.
–
Check compressed air
lines.
–
Replace positioner.
1087 PST stopped: Out of
valid position range
when back at starting
position x1
2)
–
Positional drift due to
compressed air leakage
–
Movement caused by
external forces
–
Increased noise of the
position sensor
–
Check for compressed air
leakage.
–
Check for external forces.
–
If necessary, adjust values
of the tolerance target
position (Tol_target).
1088 PST stopped: Out
of valid position
range during move-
ment from x1 to x2
2)
–
Positional drift due to
compressed air leakage
–
Movement caused by
external forces
–
Increased noise of the
position sensor
–
Check for compressed air
leakage.
–
Check for external forces.
–
If necessary, adjust values
of the tolerance target
position (Tol_target).
1089 PST stopped: Out of
valid position range
at position x2
2)
–
Positional drift due to
compressed air leakage
–
Movement caused by
external forces
–
Increased noise of the
position sensor
–
Check for compressed air
leakage.
–
Check for external forces.
–
If necessary, adjust values
of the tolerance target
position (Tol_target).
1090 PST stopped: Out
of valid position
range during move-
ment from x2 to x1
2)
–
Positional drift due to
compressed air leakage
–
Movement caused by
external forces
–
Increased noise of the
position sensor
–
Check for compressed air
leakage.
–
Check for external forces.
–
If necessary, adjust values
of the tolerance target
position (Tol_target).
1091 PST stopped: Out of
valid position range
when back at starting
position x1
2)
–
Positional drift due to
compressed air leakage
–
Movement caused by
external forces
–
Increased noise of the
position sensor
–
Check for compressed air
leakage.
–
Check for external forces.
–
If necessary, adjust values
of the tolerance target
position (Tol_target).