Maintenance And Troubleshooting; Diagnosing Problems - ABB LWT300 Series User Manual

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C h a p t E R 9

Maintenance and troubleshooting

LWT instruments are designed to withstand many industrial environmental conditions.
They contain no moving parts and, aside from the probe, no field-replaceable parts. For this reason, no
regular maintenance is required to keep the instrument in compliance.
Additionally, no user/operator adjustments inside LWT instruments are necessary or recommended by
ABB. Service tasks that are not explained in this documentation are to be performed at the factory by
qualified service personnel only.
Contact ABB for any additional information, or in the event of specific problems not covered in this user
guide.
NOTICE
Opening the instrument for any reason other than the procedures indicated in this
documentation voids the warranty.
NOTICE
Since the instrument may form part of a safety chain, ABB recommends replacing the
instrument immediately if any defects are detected.

Diagnosing problems

If the LWT instrument is malfunctioning in any way, the LCD displays specific event messages destined
to help you identify and understand the situation.
When an event happens, a message consisting of an icon and text appears at the bottom of the LCD.
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Figure 51 LCD before and during an error
Before an error
This short message gives you a quick indication of the nature of the situation at hand. The text beside
the icon provides information about the potential source of the problem.
All these text messages are saved in a diagnostic history. You can browse through this diagnostics
history and clear this history when all events have been accounted for.
During an error
Error text and icon