Troubleshooting Tables - Emerson Rosemount 2051 Reference Manual

Reference Manual
00809-0100-4107
6.4

Troubleshooting tables

Table 6-1: Rosemount troubleshooting table for 4–20 mA output
Symptom
Transmitter milliamp reading is zero
Transmitter not communicating with
Field Communicator
Transmitter milliamps reading is low or high
Transmitter will not respond to changes in
applied pressure
Digital pressure variable reading is low or high
Reference Manual
Corrective actions
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
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
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
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
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
Troubleshooting
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