48
Reference Manual
00809-0100-4022, Rev GA
Troubleshooting
September 2016
Troubleshooting
Table 5-1. Troubleshooting
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 11.25 to 42.4 V dc.
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
Ω
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.
HART message reading:
“Brown-out condition detected.”
Verify power source to transmitter has adequate voltage and current.
Check loop resistance, 250
Ω
minimum (PS voltage -transmitter
voltage/loop current).
HART message reading:
“Configuration not update due to
brown-out.”
Cycle power and repeat configuration change.
Aotewell Ltd
www.aotewell.com
Industry Automation
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+86-755-8660-6182
