Honeywell ST700 - Troubleshooting the Pressure Transducer Block; Table 20: Pressure Transducer Block

Page 98 FOUNDATION Fieldbus ST 700 Pressure Transmitter User's Guide Revision 2.0
Troubleshooting the Pressure Transducer block
Table 20: Pressure Transducer block
Problem cause Things to check Recommended action
Transducer block
mode is in OOS and
does not change to
AUTO mode.
Read
MODE_BLOCK.PERMITTED
Add AUTO mode to
MODE_BLOCK.PERMITTED.
Read MODE_BLOCK.
ACTUAL of Resource block.
If necessary, Set MODE_BLOCK.TARGET
to AUTO.
NOTE: If the mode is set to OOS for
maintenance, then do not change the mode
to AUTO.
Transducer block does
not produce valid
primary Value.
Check the Primary value
Range.
Ensure that primary Value Range has valid
ranges and units assigned.
Read BLOCK_ERR. See Table 3 for details on BLOCK_ERR.
Verify parameter:
PRIMARY_VALUE is not valid
STATUS = Good or Uncertain
VALUE = active
Isolate transmitter from process.
Perform Correct Reset calibration.
Recalibrate the transmitter.
Read SENSOR_TEMP. Must
contain the sensor
temperature.
Report information to Honeywell.
Transducer block does
not produce valid
Secondary value.
Check the Secondary value
Range.
Ensure that Secondary Value Range has
valid ranges and units assigned.
Transducer block does
not produce valid
Tertiary value.
Check the Tertiary value
Range.
Ensure that Tertiary Value Range has valid
ranges and units assigned.
Transducer block does
not produce valid Fluid
Level value.
Check the Level co-efficient
and Tank range.
Ensure that the Level co-efficient is
calculated properly. See Error! Reference
source not found..
Transducer block
shows incorrect
Electronic Housing
temperature value.
Check the Electronic Housing
temperature units.
Ensure that proper unit is assigned to
Electronic Housing temperature.
Zero calibration failed. Check the Air Pressure
applied.
Ensure that the differential pressure input is
zero while using a tube to connect the High
Pressure (HP) and Low Pressure (LP) heads.
LRV calibration failed. Check the Air Pressure
applied.
Ensure that Air pressure is applied as per the
CAL_POINT_LO value entered.
URV calibration failed. Check the Air Pressure input. Ensure that Air pressure is applied as per the
CAL_POINT_HI value entered.
Block alarms are not
reported.
Read FEATURE_SEL. Reports are not selected in FEATURE_SEL.
If features do not include Reports then the
host must poll for alarms.
Read LIM_NOTIFY. Set LIM_NOTIFY to a value higher than zero,
but not higher than MAX_NOTIFY.