FVP 110 Fieldbus Valve Positioner Manual
178
GE Energy
Troubleshooting Valve Control
Table 57 Troubleshooting Valve Control
Problem Presumed Cause Remedy See Section
A change in setpoint
causes no action of the
valve.
Air piping is incorrect. Correct piping. “Piping” on
page 52
The instrument is in FAILSAFE
state.
Write Clear non-latch to
RELEASE_FAILSAFE
parameter.
“Fail-safe Action”
on page 131
Air supply is not being fed. Supply proper air
pressure.
“Piping” on
page 52
The valve has failed. Apply a pneumatic
pressure directly to the
valve actuator and check
whether there is valve
action.
“A/M Switching”
on page 42
The I/P module or control relay
has failed, or there is breakage
in the cable between the I/P
module and control relay.
If the output pressure does
not increase even though
the
SERVO_OUTPUT_SIGN
AL value is at maximum,
contact the nearest
service station or
representative office.
—
The valve’s full stroke is
insufficient for the setpoint
input.
The air supply pressure is not
high enough to drive the valve
actuator.
Check the air supply
pressure rating for the
valve actuator and supply
air at the correct pressure,
and write 4 or 2 to
AUTO_TUNE_EXEC to
redo Autotuning.
❑ “Piping” on
page 52
❑ “Carrying out
Tuning” on
page 61
The range of the setpoint is
limited by software.
Check the values of
SP_HI_LIM and
SP_LO_LIM in the AO
block and
FINAL_VALUE_RANGE in
the transducer block.
❑ “Forward
Path” on
page 134
❑ “Function
Block Parame-
ters” on
page 183
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