FVP 110 Fieldbus Valve Positioner Manual
126
GE Energy
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
WARNING This function strokes the valve over its full range. Do not
execute while valve is controlling the process. Keep away
from the movable parts to avoid injury.
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.
Table 34 Types of Auto Tuning
Value Comment Description
1Off —
2
Travel calibration tuning at
stop point
Travel calibration at the tight-shut and full-open positions
3 Control parameter tuning Tuning of control parameters
4
Travel calibration at stop point
and Control parameter tuning
Sequential execution of travel calibration and control parameter
tuning
5 Cancel execution Cancellation of auto tuning execution
6
Travel calibration at stop point
without time out (for very large
valve)
Zero-point and span calibration at the tight-shut and full-open
positions without time out
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