Troubleshooting; Simple Fault Finding - ABB 364G Series Manual

Troubleshooting

Suggestions for the most common operating problems are given in this User's Manual.
If you su spect malfunction despite the absence of any diagnostic messages on the display, follow t he
procedures described here to verify th at transmitter hardware and process connections are in good working
order.

Simple fault finding

In case the transmitter is not working properly, carry out the following fault finding checks before contacting
your nearest Service Center.
If the transmitter is working in a control loop, the loop must be placed under local manual control
while the instrument is examined or taken out of service. Take all precautions to avoid damages
Symptom
No output current
High, low or irregular output current
Transmitter Not Communicating with HART
Communicator
Transmitter will not respond to changes in
applied pressure
Digital Pressure Variable reading is erratic
Milliamp reading is erratic
WARNING
caused by pressure or dangerous fluids release.
Check the transmitter power supply
Verify terminal voltage is 10.5 to 42 V dc (or 30Vdc in Ex ia
applications)
Check power wires for reversed polarity
Clean the electrical connections
Replace the Electronics module
Check the transmitter power supply
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
Check for trapped gas in liquid lines and liquid in dry lines
Check for sediment in process flanges
Clear the electronics module connectors contact
Replace the Electronics module
Verify the output is between 4 and 20 mA or saturation levels
Verify clean DC Po wer to transmitter (Ma x AC noise 0.2 volts
peak to peak
Check loop resistance, 250 ohm minimum
Check if unit is addressed properly
Check the test equipment
Check impulse piping or manifold for blockage
Verify applied pressure is bet ween the Lo wer Range Limit and
the Upper Range Limit
Verify output is not in alarm condition
Verify transmitter is not in Loop Test mode
Check application for faulty equipment in pressure line
Verify transmitter is n ot reacting directly to equipment turning
on/off
Verify damping is set properly for application
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
364Ax-Gx Instruction Manual
Corrective actions
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