Failure Of The Bus Ribbon
The following faults can occur to the M-bus wiring:
- Short Circuit to B+
- Short Circuit to B-
- Bus line down (open)
- Defective plug connections (damaged, corroded, or improperly crimped)
The IHK control module checks the M-bus for continuous position feedback from the stepper motors. If the M-bus is interrupted then the control unit will store a fault for every stepper motor on the bus.
In order to determine if a stepper motor is at fault for the lack of communication, disconnect one stepper motor at a time while monitoring the M-bus signal line with a voltmeter or oscilloscope. The pattern or voltage should return to normal when the defective stepper is found. As a confirmation that communication is restored, change the setting on the IHK panel, if the remaining connected flap motors assume the selected position communication is OK.
Diagnosis of the M-bus is carried out by the DISplus/MoDiC via the IHK module. Available in the Diagnosis Program are:
- Fault/symptom driven test modules
- Diagnosis request (flap position)
- Component activation (flap activation)
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