Endress+Hauser iTEMP TMT82 - Diagnostics and Troubleshooting; Troubleshooting

iTEMP TMT82 Diagnostics and troubleshooting
Endress+Hauser 37
11 Diagnostics and troubleshooting
11.1 Troubleshooting
Always start troubleshooting with the checklists below if faults occur after start up or
during operation. This takes you directly (via various queries) to the cause of the problem
and the appropriate remedial measures.
Due to its design, the device cannot be repaired. However, it is possible to send the
device in for examination. See the information in the "Return" section. →  43
General errors
Problem Possible cause Remedy
Device is not responding. Supply voltage does not match that
specified on the nameplate.
Apply correct voltage.
Connecting cables are not in contact
with the terminals.
Check the contacting of the cables and
correct if necessary.
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 not properly
connected.
Connect Commubox correctly .
Commubox is not set to "HART". Set Commubox selector switch to
"HART".
Status LED is lit or flashing
red (DIN rail transmitter
only).
Diagnostics events as per NAMUR
NE107 →  39
Check diagnostics events:
• LED is lit: diagnostic display, category
F
• LED flashing: diagnostic display of
categories C, S or M
Power LED is not lit green
(DIN rail transmitter only).
Power failure or insufficient supply
voltage
Check the supply voltage and check if
wiring is correct.
Check display (optional in conjunction with head transmitter)
Problem Possible cause Remedy
No display visible
No supply voltage • Check the supply voltage at the head
transmitter, terminals + and -.
• Ensure that the display module
holders are correctly seated and that
the display module is properly
connected to the head transmitter.
• If possible, test the display module
with other suitable head transmitters
e.g. Endress+Hauser head
transmitter.
The display module is defective. Replace the module.
The electronics of the head
transmitter are defective.
Replace the head transmitter.