Emerson MICRO MOTION HFVM Series Configuration And Use Manual page 146

Troubleshooting
Table 10-7: Milliamp output problems and recommended actions
Problem Possible causes
mA output below •
4 mA •
•
•
•
•
Constant mA output •
•
•
•
mA output below •
3.6 mA or above
21.0 ma •
•
Consistently incorrect •
mA measurement •
•
•
•
mA output correct at •
lower current, but in-
correct at higher cur-
rent
140
Open in wiring
Bad output circuit
Process condition below LRV
LRV and URV are not set correctly
Fault condition if Fault Action is set to Internal
Zero or Downscale
Bad mA receiving device
Incorrect process variable assigned to the
output
Fault condition exists
Non-zero HART address (mA Output 1)
Output is configured for loop test mode
Incorrect process variable or units assigned
to output
Fault condition if Fault Action is set to Upscale
or Downscale
LRV and URV are not set correctly
Loop problem
Output not trimmed correctly
Incorrect measurement unit configured for
process variable
Incorrect process variable configured
LRV and URV are not set correctly
mA loop resistance may be set too high
Micro Motion
(continued)
Recommended actions
• Check your process conditions against the
values reported by the device.
• Verify the receiving device, and the wiring
between the transmitter and the receiving
device.
• Check the settings of Upper Range Value and
Lower Range Value. See
• Check the Fault Action settings. See
Section 10.16.
• Verify the output variable assignments.
• View and resolve any existing alert condi-
tions.
• Check the HART address. If the HART ad-
dress is non-zero, you may need to change
the setting of mA Output Action (Loop Current
Mode).
• Check to see if a loop test is in process (the
output is fixed).
• Check HART burst mode configuration.
• Verify the output variable assignments.
• Verify the measurement units configured
for the output.
• Check the Fault Action settings. See
Section 10.16.
• Check the settings of Upper Range Value and
Lower Range Value. See
• Check the mA output trim. See
Section 10.13.
• Check the mA output trim. See
Section 10.13.
• Verify that the measurement units are con-
figured correctly for your application.
• Verify the process variable assigned to the
mA output.
• Check the settings of Upper Range Value and
Lower Range Value. See
• Verify that the mA output load resistance
is below the maximum supported load
(see the installation manual for your trans-
mitter).
® Heavy Fuel Viscosity Meters (HFVM) Viscomaster
Section 10.15.
Section 10.15.
Section 10.15.
™