33
Electro-Pneumatic Positioner
TS600 Series
tissin
7.4
Other Problems and Resolution
☞
The positioner does not operate
Checklist
Causes
Corrective action
Reference
page
If it does not work by moving
the nozzle flapper
A/M switch is loose
Check to see if A/M
switch is connected
31
Nozzle clogged
Nozzle needs clean up
31
If it works by moving the
nozzle flapper to the left and
right
incorrect connections for
input current
Check the wire
connection
24~28
☞
The actuator works only with ON / OFF control but not intermediate control.
Checklist
Causes
Corrective action
Reference
page
Linear type, check span
mounting
Span is mounted upside
down
Turn the span body
22
Rotary type, check cam
mounting
Cam is mounted upside
down
Mount the cam
correctly
23
Check OUT1, OUT2 pipeline
OUT1 and OUT2 Pipelines
are connected in opposite
directions
Install pipeline correctly
22~23
☞
Hunting occurs
Checklist
Causes
Corrective action
Reference
page
Hunting period is too short
and the width is too large
(pressure gauge moves at
the same time of valve stem)
Actuator volume is too low
Install the orifice on the
bottom part of the pilot
31
Hunting period is too long
and the width is too small
(Gauge markings move and
valve stem slowly follow)
High temperature high
pressure valve stem has a
large frictional force
1 Perform a necessary
action to minimize
resistance of actuator
or valve stem
2 Increase actuator size
N/A
☞
Linearity is too bad
Checklist
Causes
Corrective action
Reference
page
Zero and span setting
zero and span setting is
incorrect
Resetting zero and
span
29
Check Input pressure is
constant
Input pressure is not
constant
Check the pressure
relief valve on supply
pressure is normal.
N/A
Verify lever installation
Lever does not provide
optimum rotation angle
Adjust bracket and
place drawbar on valve
opening mark
21
☞
Hysteresis is too bad
Checklist
Causes
Corrective action
Reference
page
Check connection of lever
spring
Gap between the lever
Tighten the connection
to remove the gap
19~21
