Otis · DSD 412 Elevator System
This fault indicates that the Armature CEMF voltage exceeds 20% of its rated value during a test. This condition may occur during Self-Tune (Function #997) or Self-Diagnostic (Function #998).
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Ensure the motor is mechanically locked and not rotating during the test.
Ensure that the brush commutator is clean to minimize armature resistance.
Temporarily increase parameter #7 (Rated Armature Volts) during the test.