Emerson Rosemount 3051P, Reference Manual, Page: 68 / 110

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Reference Manual
00809-0700-4001, Rev AA
Troubleshooting
May 2017
Troubleshooting
Table 6-1. Rosemount 3051P Troubleshooting for 4–20 mA Output
Symptom Corrective actions
Transmitter milliamp reading is
zero
Verify terminal voltage is 10.5 to 42.4 Vdc at signal terminals
Check power wires for reversed polarity
Check that power wires are connected to signal terminals
Check for open diode across test terminal
Transmitter not communicating
with Field Communicator
Verify terminal voltage is 10.5 to 42.4 Vdc
Check loop resistance, 250
Ω
minimum (PS voltage -transmitter voltage/loop current)
Check that power wires are connected to signal terminals and not test terminals
Verify clean DC Power to transmitter (Max AC noise 0.2 volts peak to peak)
Verify the output is between 4 and 20 mA or saturation levels
Have Field Communicator poll for all addresses
Transmitter milliamps reading is
low or high
Verify applied pressure
Verify 4 and 20 mA range points
Verify output is not in alarm condition
Perform analog trim
Check that power wires are connected to the correct signal terminals (positive to positive,
negative to negative) and not the test terminal
Transmitter will not respond to
changes in applied pressure
Check impulse piping or manifold for blockage
Verify applied pressure is between the 4 and 20 mA points
Verify the output is not in alarm condition
Verify transmitter is not in loop test mode
Verify transmitter is not in multidrop mode
Check test equipment
Digital pressure variable reading
is low or high
Check impulse piping for blockage or low fill in wet leg
Verify transmitter is calibrated properly
Check test equipment (verify accuracy)
Verify pressure calculations for application
Digital pressure variable reading
is erratic
Check application for faulty equipment in pressure line
Verify transmitter is not reacting directly to equipment turning on/off
Verify damping is set properly for application
Milliamps reading is erratic Verify power source to transmitter has adequate voltage and current
Check for external electrical interference
Verify transmitter is properly grounded
Verify shield for twisted pair is only grounded at one end