ABB 2600T Pressure Transmitter Series, Руководство пользователя

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364xS User’s Manual 59
Replacement and troubleshooting
Troubleshooting
Suggestions for the most common operating problems are given in this User’s Manual.
If you suspect malfunction despite the absence of any diagnostic messages on the display, follow the
procedures described here to verify that 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.
WARNING
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
caused by pressure or dangerous fluids release.
Symptom Corrective actions
ƒ Check the transmitter power supply
ƒ Verify terminal voltage is 10.5 to 42 V dc (or 30Vdc in EEx ia
applications)
ƒ Check power wires for reversed polarity
ƒ Clean the electrical connections
No output current
ƒ Replace the Electronics module
ƒ Check the transmitter power supply
ƒ Verify applied pressure
ƒ Verify 4 and 20 mA range points
ƒ Verify output is not in alarm condition
ƒ Verify if 4 – 20 mA output trim is required
ƒ
Check for trapped gas in liquid lines and liquid in dry lines
ƒ Check for sediment in process flanges
ƒ Clear the electronics module connectors contact
High, low or irregular output current
ƒ Replace the Electronics module
ƒ Verify the output is between 4 and 20 mA or saturation levels
ƒ Verify clean DC Power to transmitter (Max AC noise 0.2 volts
peak to peak
ƒ Check loop resistance, 250 ohm minimum
Transmitter Not Communicating with HART
Communicator
ƒ Check if unit is addressed properly
ƒ Check the test equipment
ƒ
Check impulse piping or manifold for blockage
ƒ Verify applied pressure is between the Lower Range Limit and
the Upper Range Limit
ƒ Verify output is not in alarm condition
Transmitter will not respond to changes in
applied pressure
ƒ Verify transmitter is not in Loop Test mode
ƒ Check application for faulty equipment in pressure line
ƒ
Verify transmitter is not reacting directly to equipment turning
on/off
Digital Pressure Variable reading is erratic
ƒ Verify damping is set properly for application
ƒ Verify power source to transmitter has adequate voltage and
current
ƒ Check for external electrical interference
ƒ Verify transmitter is properly grounded
Milliamp reading is erratic
ƒ Verify shield for twisted pair is only grounded at one end