Endress+Hauser iTEMP TMT142B - Diagnostics and troubleshooting; General troubleshooting

iTEMP TMT142B Diagnostics and troubleshooting
Endress+Hauser 37
9 Diagnostics and troubleshooting
9.1 General troubleshooting
Always start troubleshooting with the checklists below if faults occur after startup or
during operation. The checklists take you directly (via various queries) to the cause of the
problem and the appropriate remedial measures.
In the event of a serious fault, the device might have to be returned to the
manufacturer for repair. Refer to the "Return" section before the device is returned to
the manufacturer. →  44
General errors
Error Possible cause Remedy
Device is not responding. Supply voltage does not match the
voltage specified on the nameplate.
Check the voltage at the transmitter
directly using a voltmeter and correct.
Connecting cables are not in contact
with the terminals.
Check the contacting of the cables and
terminals and correct if necessary.
Electronics unit is defective. Replace the device.
Output current < 3.6 mA Signal line is not wired correctly. Check wiring.
Electronics unit is defective. Replace the device.
HART communication is not
working.
Missing or incorrectly installed
communication resistor.
Install the communication resistor (250
Ω) correctly.
Commubox is connected incorrectly. Connect Commubox correctly.
Commubox is not set to "HART". Set Commubox selector switch to
"HART".

Check display (local display)
Display is blank - no connection to
the HART host system.
1. Check the supply voltage → terminals + and -
2. Measuring electronics defective → order spare part, →  42
Display is blank - however,
connection has been established to
the HART host system.
1. Check whether the display module fitting kit is correctly seated on the
electronics module →  14
2. Display module defective → order spare part, →  42
3. Measuring electronics defective → order spare part, →  42

Local error messages on the display
→  39

Faulty connection to the fieldbus host system
Error Possible cause Remedy
HART
communication is
not working.
Missing or incorrectly installed
communication resistor.
Install the communication resistor (250 Ω)
correctly.
Commubox is connected incorrectly. Connect Commubox correctly.