Lenze 8400 TopLine - Manual (Page 334)

6 Encoder/feedback system
6.3 Multi-Encoder (X8)
334
Lenze · 8400 TopLine · Reference manual · DMS 6.0 EN · 06/2014 · TD05/TD14
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6.3.2.4 Notes on evaluating absolute value encoder of SEL37 and SELxx types by SICK
For version 02.xx.xx the following applies:
• The 8400 TopLine controller recognises these encoder types, but sporadically reports the error
" Sd4: open circuit MultiEncoder " error if the open-circuit monitoring is activated in C00603/1
(Lenze setting).
• The reason for this is a faulty open-circuit monitoring during the initialisation of the
controller.
• The error can be acknowledged so that the controller is able to start correctly.
• Moreover, the initialisation time of the encoder is critical. This is the time needed internally by
the encoder to respond to a read request of the controller.
• The maximum initialisation time in the controller is permanently set to 5.2 s. Depending on
the encoder used, it may be possible that this time is not sufficient (see data sheet for the
encoder manufacturer)!
• If the monitoring (e.g. die open-circuit monitoring) triggers with the "Fault" error response due
to an encoder error during operation, the position is not valid anymore in case of absolute value
encoders and must be reread from encoder.
• After the error message is reset, this does not take place automatically which may cause a
wrong position!
• Remedy: After the error message is reset with the SB LS_ParReadWrite_1 , rewrite the code
C00422 and thus enforce a re-initialisation of the encoder. Then enable the application.
From version 12.00.00 the following applies:
• The initialisation time of the encoder is not critical anymore since the maximum initialisation
time can now be adjusted in C00430/1 (to max. 20 seconds).
• During the set initialisation time, the controller remains in the "Init" device state and cannot
be enabled.
• The open-circuit monitoring is also suppressed during the set initialisation time so that the
error behaviour of the version 02.xx.xx is remedied as well.
• If the monitoring (e.g. die open-circuit monitoring) triggers with the "Fault" error response due
to an encoder error during operation, the position is not valid anymore in case of absolute value
encoders and must be reread from encoder.
• After the error message is reset, this takes place automatically.