Carrying Out Tuning - GE FVP110 Maintenance Manual

Carrying out Tuning

Carrying out Tuning
You now carry out auto tuning (and manual tuning, if necessary). The auto tuning
program automatically:
❑
Adjusts the zero-point and span.
❑
Adjusts the parameter settings for controlling the valve.
Auto Tuning in FVP110 sets the 0% point at the position where the valve is fully closed
and 100% point at the position where the valve stem stops against the mechanical
stopper (fully open). If it is necessary to adjust the zero point and span precisely to the
rated stroke of the valve, carry out travel calibration ( "Travel Calibration" on page 63).
To carry out auto tuning, write a value to the parameter AUTO_TUNE_EXEC:
1. To sequentially adjust the zero-point and span, and then control parameter settings
for the first time after installing the FVP110 on a valve actuator, write: 4 (= travel
calibration at stop point and control parameter tuning).
2. To leave the control parameter settings unchanged and only perform zero-point and
span adjustments such as after detaching the FVP110 from the valve actuator and
restoring it, write: 2 (= travel calibration at stop point).
3. To leave zero-point and span settings unchanged and only adjust control parameter
settings, such as after the hysteresis of the valve actions has greatly changed,
write:
❑
The time needed to complete the adjustments, which varies with the actuator
size and the hysteresis of the actions, is roughly 4 minutes for a mid-capacity
(capacity of around 3 liters) actuator.
❑
If you want to abort auto tuning for some reason such as when you have started
it while leaving the air supply shut off, write: 5 (= cancel execution).
This function strokes the valve over its full range. Do not
WARNING
execute while valve is controlling the process. Keep away
from the movable parts to avoid injury.
For the first time after installing the FVP110 on the actuator
CAUTION
or anytime after detaching the FVP110 and installing it again
on the actuator, be sure to perform step 1, or 2 and 3 to
carry out all adjustments. Otherwise, the adjustments
cannot be carried out correctly. From the next and any time
thereafter, perform only step 2 or 3 independently.
After detaching the FVP110 from the valve actuator and
then reinstalling it to the actuator, be sure to perform step 2.
61
Setup