Emerson 3051S Especificaciones descargar pdf (Pagina 92)

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

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