When you shut off of a single phase motor followed by a quick change in direction, it can cause the motor to work harder because of the change of direction.
This causes the motor to consume a larger amount of current (it has a larger inrush current).
The reason why it consumes a larger amount of current is because the motor is in the process of reversing its magnetic poles which is accomplished by reversing the polarity of the starter winding.
This may be enough current to trip some Circuit breakers.
Failure to extend the change over time may result in the motor burning out, or consistent nuisance tripping of a circuit breaker.
Or potentially even the motor not reversing direction.
By increasing the “change over delay” to meet the blind manufacturers specifications should prevent any of these issues from happening.
This causes the motor to consume a larger amount of current (it has a larger inrush current).
The reason why it consumes a larger amount of current is because the motor is in the process of reversing its magnetic poles which is accomplished by reversing the polarity of the starter winding.
This may be enough current to trip some Circuit breakers.
Failure to extend the change over time may result in the motor burning out, or consistent nuisance tripping of a circuit breaker.
Or potentially even the motor not reversing direction.
By increasing the “change over delay” to meet the blind manufacturers specifications should prevent any of these issues from happening.
Released for:Schneider Electric UK
