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Milliamp output problems and recommended actions (continued)Table 10-5:
Problem Possible causes Recommended actions
mA output below
3.6 mA or above
21.0 ma
• 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
• Verify the output variable assignments.
• Verify the measurement units configured
for the output.
• Check the Fault Action settings. See
Section 10.19.
• Check the settings of Upper Range Value and
Lower Range Value. See Section 10.18.
• Check the mA output trim. See
Section 10.16.
Consistently incorrect
mA measurement
• Loop problem
• Output not trimmed correctly
• Incorrect measurement unit configured for
process variable
• Incorrect process variable configured
• LRV and URV are not set correctly
• Check the mA output trim. See
Section 10.16.
• 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 Section 10.18.
mA output correct at
lower current, but in-
correct at higher cur-
rent
• mA loop resistance may be set too high • Verify that the mA output load resistance
is below the maximum supported load
(see the installation manual for your trans-
mitter).
10.13 Discrete output problems
Problem Possible causes Recommended actions
No discrete output • Output not powered
• Wiring problem
• Circuit failure
• Verify that the output loop is powered ex-
ternally.
• Check the power supply and power supply
wiring. See Section 10.2.
• Verify the output wiring.
• Contact Micro Motion.
Loop test failed • Output not powered
• Power supply problem
• Wiring problem
• Circuit failure
• Circuit failure
• Verify that the output loop is powered ex-
ternally.
• Check the power supply and power supply
wiring. See Section 10.2.
• Verify the output wiring.
• Contact Micro Motion.
Discrete output read-
ings reversed
• Wiring problem
• Configuration does not match wiring
• Verify the output wiring.
• Ensure that Discrete Output Polarity is set cor-
rectly.
Troubleshooting
178 Micro Motion
®
Fork Viscosity Meters (FVM)