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10.12 Milliamp output problems
Milliamp output problems and recommended actionsTable 10-5:
Problem Possible causes Recommended actions
No mA 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.
• Check the Fault Action settings. See
Section 10.19.
• Contact Micro Motion.
Loop test failed • Output not powered
• Power supply problem
• 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.
• Check the Fault Action settings. See
Section 10.19.
• Contact Micro Motion.
mA output below
4 mA
• 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
• 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 Section 10.18.
• Check the Fault Action settings. See
Section 10.19.
Constant mA output • Incorrect process variable assigned to the
output
• Fault condition exists
• Non-zero HART address (mA Output 1)
• Output is configured for loop test mode
• 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.
See Check HART burst mode.
Troubleshooting
Configuration and Use Manual 177