Danfoss MCB 152, Operating Instructions Manual

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9.3 Error Conditions
This chapter provides troubleshooting tables for diagnosing error conditions associated with the safety option.
The safety option differentiates between the error types shown in Table 9.1 .
Error type Description Effect on the system Reset condition
Internal error Severe exceptional error caused by the program run
in the safety option. Cyclic program sequence is no
longer possible for safety related reasons. The system
enters the defined safe state. Output S37 is switched off. Reset possible by power
cycling the frequency
converter, or by restarting the
safety option via
42-90 Restart
Safe Option
External error Functional error, caused by an external process. Both
systems continue to run cyclically and serve all
requests from the communication interfaces. Sensing
of the external process is also maintained. The
system enters the defined safe state. Output S37 is switched off. Apply areset signal to the
safety option via input DI2,
the Reset key or via fieldbus.
For information about the
reset functionality, see
chapter 6.3 Reset Function .
Table 9.1 Error Types
Maintenance, Diagnostics an... Safety Option MCB 152
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