Diagnosis And Troubleshooting; General Troubleshooting - Endress+Hauser Proline Teqwave MW 300 Operating Instructions Manual

Diagnosis and troubleshooting

For local display
Fault
Local display is dark, but signal output is within
the valid range
Local display dark and no output signals
Local display cannot be read, but signal output is
within the valid range
Local display is dark, but signal output is within
the valid range
Backlighting of local display is red
Text on local display appears in a language that
cannot be understood.
Message on local display:
"Communication Error"
"Check Electronics"
For output signals
Fault
Signal output outside the valid range
Signal output outside the valid current range
(< 3.6 mA or > 22 mA)
Device shows correct value on local display, but
signal output is incorrect, though in the valid
range.
Device measures incorrectly.
Unexpected and significant difference with
regard to the laboratory value
134
12 Diagnosis and troubleshooting
12.1

General troubleshooting

Possible causes
The cable of the display module is not plugged in
correctly.
Supply voltage does not match the voltage
specified on the nameplate.
Supply voltage has incorrect polarity.
No contact between connection cables and
terminals
• Terminals are not plugged into the I/O
electronics module correctly.
• Terminals are not plugged into the main
electronics module correctly.
• I/O electronics module is defective.
• Main electronics module is defective.
Display is set too bright or too dark.
Display module is defective.
Diagnostic event with "Alarm" diagnostic
behavior has occurred.
The selected operating language cannot be
understood.
Communication between the display module and
the electronics is interrupted.
Possible causes
Main electronics module is defective.
Main electronics module is defective.
I/O electronics module is defective.
Parameter configuration error
Configuration error or device is operated outside
the application.
Formation of buildup on the antennas

Buildup usually produces a positive
difference with regard to the laboratory
value.
Proline Teqwave MW 300 HART
Remedial action
Insert the plug correctly into the main
electronics module and display module.
Apply the correct supply voltage .
Reverse polarity of supply voltage
Ensure electrical contact between the cable and
the terminal.
Check terminals.
Order spare part →  160.
• Set the display brighter by simultaneously
pressing  + .
• Set the display darker by simultaneously
pressing  + .
Order spare part →  160.
Take remedial measures →  146
1. Press  +  for 2 s ("home position").
2. Press .
3. Configure the required language in the
Display language parameter (→  105).
• Check the cable and the connector between
the main electronics module and display
module.
• Order spare part →  160.
Remedial action
Order spare part →  160.
Order spare part →  160.
Check and adjust parameter configuration.
1. Check and correct parameter configuration.
2. Observe limit values specified in the
"Technical Data".
1. Remove buildup.
2. Perform a new adjustment →  130.

When removing the buildup, make sure
that the measuring tube, the antennas and
the temperature sensor are neither
mechanically damaged nor chemically
corroded.
Endress+Hauser