Emerson Rosemount 3051S Series, Reference Manual, Page: 92 / 240

Reference Manual
00809-0100-4801, Rev FA
October 2010
Rosemount 3051S Series
5-2
Table 5-1. Rosemount 3051S
troubleshooting table
Symptom Corrective Actions
Transmitter milliamp reading is zero Verify power is applied to signal terminals
Check power wires for reversed polarity
Verify terminal voltage is 10.5 to 42.4 Vdc
Check for open diode across test terminal
Transmitter Not Communicating with
Field Communicator Verify the output is between 4 and 20 mA or saturation levels
Verify clean DC Power to transmitter (Max AC noise 0.2 volts peak to peak)
Check loop resistance, 250

minimum (PS voltage -transmitter voltage/loop current)
Check if unit is addressed properly
Transmitter milliamp reading is low or high Verify applied pressure
Verify 4 and 20 mA range points
Verify output is not in alarm condition
Verify if 4 – 20 mA output trim is required
Transmitter will not respond to changes in
applied pressure Check test equipment
Check impulse piping or manifold for blockage
Verify applied pressure is between the 4 and 20 mA set points
Verify output is not in alarm condition
Verify transmitter is not in Loop Test mode
Digital Pressure Variable reading is low or high Check test equipment (verify accuracy)
Check impulse piping for blockage or low fill in wet leg
Verify transmitter is calibrated properly
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
Milliamp 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
Transmitter output is normal but LCD is off
Diagnostics indicates an LCD problem Replace LCD