Texas Instruments MCT8316A, Tuning Manual, Page: 10 / 23

Check Section 3.6 for steps to debug faults.
This completes the essential controls section. At the end of this section, user should be able to spin the motor in
closed loop. Save the register settings by clicking File->Save Registers in the GUI. If there were no faults, skip to
Section 4 .
Figure 3-1. Fault Status
3.6 Fault handling
Below are the faults that can possibly get triggered based on the default register configuration specified in
Section 3.1 .
3.6.1 Abnormal Speed [ABN_SPEED]
MCT8316A monitors the speed continuously by calculating difference in time between subsequent back-
EMF zero crossings. This fault gets triggered when motor speed exceeds abnormal speed threshold
[LOCK_ABN_SPEED]. When the motor gets stuck in the first electrical cycle, device continues to commutate at
frequencies above the configured abnormal speed threshold [LOCK_ABN_SPEED].
When this fault gets triggered, follow below recommendations.
1. Increase align time [ALIGN_TIME].
2. Decrease slow first cycle frequency [SLOW_FIRST_CYC_FREQ]
3. Decrease open loop acceleration A1 [OL_ACC_A1] and open loop acceleration A2 [OL_ACC_A2].
4. Decrease closed loop acceleration [CL_ACC]
3.6.2 Loss of Sync [LOSS_OF_SYNC]
This fault gets triggered when the motor loses synchronization due to improper selection of motor startup and
open loop acceleration profiles.
When motor loses synchronization, we might notice the motor either vibrate or stall.
When the motor vibrates, follow the below recommendations.
1. Increase align time [ALIGN_TIME].
2. Increase open loop acceleration A1 [OL_ACC_A1] and open loop acceleration A2 [OL_ACC_A2].
When the motor stalls, follow the below recommendation.
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10 MCT8316A Tuning Guide SLLU336 – MAY 2021
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