What is the purpose of a VFD’s “DC injection braking” feature?
A. To provide a braking force to slow down the motor
B. To reduce the current flowing through the motor
C. To improve the accuracy of flow control
D. To protect the VFD from overloading
Answer:A
What is the purpose of a VFD’s “DC injection braking” feature?
A. To provide a braking force to slow down the motor B. To reduce the current flowing through the motor C. To improve the accuracy of flow control D. To protect the VFD from overloading
Explanation: Some VFDs include a feature called “DC injection braking”, which is used to slow down the motor by applying a braking force. This is achieved by injecting a DC current into the motor, which creates a magnetic field that opposes the rotation of the motor. This braking force slows down the motor, allowing it to come to a stop more quickly and smoothly than it would without this feature.