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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

Danfoss MCB 152 User Manual

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