54
Failure modes
Appendix B
Instruction book, IQAN-MC3
Failure modes for external wiring faults on power drivers - COUT
NOTICE
Failure modes for internal faults are included in the total PFHd for the module.
Key to symbols and conditions
• = detection leads to the power driver being disabled. Restart conditions are applicaton
specific.
Start-up: When module is started, all COUT and CRET are off, a test pattern is applied
to detect faults.
Off: When power driver is off, COUT is on, and CRET is off.
On: When power driver is on, COUT is on, and CRET is controlling the commanded
current.
Disabled: After an error is detected, both COUT and CRET are off. No diagnostic is
performed until there is an attempt to reactivate the output. Restart condtions are
application specific
* = Reverse feed of the module. Ability to shut down module via +BAT inhibited.
Ability to shut down in the event of an internal error reduced. Detected at next start-up
Current output
Start-up
Failure mode Detected Comment
COUT short circuit to +BAT at start-up • Module prevented from starting.
CRET short circuit to +BAT at start-up • Module prevented from starting.
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