Yokogawa YVP110 - Manual (Page 138)

<Appendix 3. DD Methods and DD Menu>
A-27
IM 21B04C01-01E
5) Travel Calibration
This method guides you through each step to
carry out travel calibration. See the respective
descriptions in Section 5.3, “Carrying out Auto
Tuning.”
Travel calibration procedure
• AO/Transducer block mode check
• Execute travel calibration
0% calibration:
Adjustment of FINAL_VALUE (by moving
the valve position to the desired 0%
position)
Execute 0% calibration:
TRAVEL_CALIB_EXEC
Span calibration:
Adjustment of FINAL_VALUE (by moving
the valve position to the desired 100%
position)
Execute span calibration:
TRAVEL_CALIB_EXEC
50% calibration:
Adjustment of FINAL_VALUE (by moving
the valve position to the desired 50%
position)
Execute 50% calibration:
TRAVEL_CALIB_EXEC
Exit
6) Operational Parameter Configuration
This method guides you through the setting of
individual operational parameters excluding the
selection of position-to-flow rate characteristic type.
Operational parameter configuration procedure
• AO/Transducer block mode check
• Operational parameter configuration
Position Limit setting:
FINAL_VALUE_CUTOFF_LO
FINAL_VALUE_CUTOFF_HI
FINAL_VALUE_RANGE
Limit Switch setting:
LIM_SW_LO_LIM
LIM_SW_HI_LIM
Fault Control:
DEVIATION_LIM
DEVIATION_TIME_TH(1)
DEVIATION_TIME_TH(2)
Others:
NEAR_CLOSE_THRESHOLD
Exit
7) Release Fail Safe
This is a method for releasing the device latched by
the fail-safe actions, restoring it to the normal state.
Procedure of releasing fail safe
• Check whether the device is in the latched
state.
• Write “Clear-latched” to parameter RELEASE_
FAIL_SAFE if the device is in the latched state,
to release it from the latched state.
8) Instant Trouble Shooting
This is a help utility which provides troubleshooting
instructions such as indicating the points and
parameters to be checked for troubleshooting.
This method does not contain a utility to change
parameter settings. For troubleshooting of device
statuses, see Chapter 18, “Troubleshooting.”
Instant troubleshooting procedure
• Commanded to check DEVICE_STATUS in the
resource block
• Check XD_ERROR and the remedy will be
displayed if an error has been detected
• Check RELEASE_FAIL_SAFE
• Commanded to check the mechanical linkage,
piping, and installation conditions
• Commanded to check the correct operation of
the device hardware
9) Self Check Execution
The self-check measures the valve’s characteristics
in the same fashion as in auto tuning, and makes
no changes to parameter settings.
Self Check Execution procedure
• AO/TB block mode check
• Self check execution: AUTO_TUNE_EXEC
10) Signature Execution
This method guides you through each step to
perform signature measurement (see Chapter
17, “Diagnostics”). Signature measurement
entails off-line diagnostics functions to measure
characteristics of the valve and positioner.
Comparing the current signature data with the
previously measured data gives clues to identify
the deterioration status and a possible need of
maintenance.