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The way this part works is that once it goes into a “trip” condition, a self heating property keeps the part open circuit until all current has been removed. In our case, that means bringing the power to the DC motor to zero (0). Once this happens, the part will cool down to the reset condition.
If a motor is very quickly being brought back to stall level, or continuously operated close to the trip point max, there could be a “chattering” affect because the thermal device is being operated “hot”. So, in the case described in the post, it sounds like it is doing it’s job of protecting the motor.
In general, if a motor is experiencing this chattering, we suggest allowing time after a trip condition for the thermal stall sensor to cool down before re-applying heavy load conditions to the affected motor. Or, use the stall sensor power cables just for testing and prototyping of the robot during initial design and build. Once the design and software has been worked out, switch to the standard power cables.