ABB LLT100, Руководство по функциональной безопасности

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Operation and maintenance
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Possible error messages
If the LLT100 is malfunctioning in any way, the LCD displays specific error messages destined to help
you identify and solve the problem. The chapter “Troubleshooting and service” of the Operating
Instructions guide explain where the error summary appears and how to access the full details of the
error.
CPU internal faults will result in the LOW alarm independent from the configured alarm current. Other
failures will be immediately signaled within the LOW or HIGH alarm range in line with the configured
alarm current.
Maintenance
The LLT100 should have its optical interface (glass) inspected and cleaned when the proof test is
performed (as described in “Testing the instrument” on page 23).
Repair
To maintain safety operation, repairs must be performed by ABB after the instrument is taken out
of service. Replacing modular components by original ABB spare parts is permitted if personnel was
trained by ABB for this purpose.
Before sending the unit to ABB, it must be cleaned and decontaminated. ABB must be contacted to
obtain the Contamination Data Sheet. After filling and sending the contamination data sheet to ABB, an
RMA number will be attributed and after those steps the unit can be sent to ABB for repair.
Refer to Operating Instruction manual for further details.
Software updates
Software updates, if applicable and recommended by ABB, must be performed by ABB trained
personnel after the instrument is taken out of service.
Useful life
The applied failure rates of the components are valid within the usable service life (8 to 12 years)
according to IEC 61508-2 section 7.4.9.5, note 3, and start increasing after this period.
ABB notification
All detected failures that compromise functional safety shall be reported to ABB. Contact ABB customer
service as described in “Support” on page 7.