Otis · DSD 412 Elevator System
The motor speed has exceeded the trip level set in parameter #12, as measured by the encoder. Parameter #12 defines a percentage of the motor speed value set in parameter #11.
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Check parameters #10, #11, and #12 for correct settings.
Check speed regulator tuning parameters #40, #41, and #42.
Verify the velocity reference is not set above the motor's rated speed.
Inspect the velocity encoder for intermittent operation.