Emerson 3051S Specifikace stáhnout pdf (Strana 124)

Reference Manual

00809-0100-4803, Rev DA

Section 5: Troubleshooting

April 2013

Troubleshooting

Table 5-2. Transmitter troubleshooting

Symptom Corrective Actions

Transmitter milliamp output is zero Verify power is applied to signal terminals

Check power wires for reversed polarity

Verify terminal voltage is 12 to 42.4 Vdc

Check for open diode across test terminal on 3051S MultiVariable terminal

block

Transmitter not communicating with 375,

AMS, or Engineering Assistant

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, 250-1321 

Loop Resistance = (Power supply voltage - transmitter voltage) / loop current

Check if unit is at an alternate HART address

Transmitter milliamp output is low or high Verify applied process variables

Verify 4 and 20 mA range points and flow configuration

Verify output is not in alarm or saturation condition

An analog output trim or sensor trim may be required

Transmitter will not respond to changes in

measured process variables

Check to ensure that the equalization valve is closed

Check test equipment

Check impulse piping or manifold for blockage

Verify primary variable measurement is between the 4 and 20 mA set points

Verify output is not in alarm or saturation condition

Verify transmitter is not in Loop Test, Multidrop, Test Calculation,

or Fixed Variable mode

Digital Variable output is low or high Check test equipment (verify accuracy)

Check impulse piping for blockage or low fill in wet leg

Verify transmitter sensor trim

Verify measured variables are within transmitter limits

Digital Variable output is erratic Check application for faulty equipment in process line

Verify transmitter is not reacting directly to equipment turning on/off

Verify damping is set properly for application

Milliamp output 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

and diagnostics indicate an LCD problem

Verify LCD display is installed correctly

Replace LCD display

Transmitter indicating a flow value and/or

DP value during no flow condition

Zero DP sensor

Verify DP Low Flow Cutoff setting

1 2 ... 119 120 121 122 123 124 125 126 127 128 129 ... 187 188

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