Limit Switches; Auto Tuning; Types Of Auto Tuning - GE FVP110 Maintenance Manual

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Limit Switches

Limit switches monitor whether the valve position has reached a specified high or low limit
position and sends the high limit switch status to channel 2 and the low limit switch status
to channel 3. The thresholds (settings) for the high and low limit switches are set in
LIMSW_HI_LIM and LIMSW_LO_LIM. The switch statuses sent to channels 2 and 3
mean:
❑
0 = off (inactive)
❑
1 = on (active)
Hysteresis of 1% is applied for both High and Low limit switch. While the limit switch of
high side stays ON, it turns to OFF again only when the value of
FINAL_POSITION_VALUE becomes smaller by 1% or less than the value of
LIMSW_HI_LIM. Also, while limit switch of the low side stays ON, it turns to OFF again
only when the value of FINAL_POSITION_VALUE becomes greater by 1% or more than
the value of LIMSW_LO_LIM.

Auto Tuning

Auto tuning checks the valve responses and automatically tunes control parameter
settings. The actions performed are chosen as shown in Table 34. To carry out auto
tuning, see "Carrying out Tuning" on page 61. Before carrying out auto tuning, change the
modes of the AO function block and transducer block to O/S.
Value
1 Off
Travel calibration tuning at
2
stop point
3 Control parameter tuning
Travel calibration at stop point
4
and Control parameter tuning
5 Cancel execution
Travel calibration at stop point
6
without time out (for very large
valve)
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.
Table 34 Types of Auto Tuning
Comment
—
Travel calibration at the tight-shut and full-open positions
Tuning of control parameters
Sequential execution of travel calibration and control parameter
tuning
Cancellation of auto tuning execution
Zero-point and span calibration at the tight-shut and full-open
positions without time out
FVP 110 Fieldbus Valve Positioner Manual
Description
126