A DC motor fails to start when switched on. What could be the possible reasons and remedies?

Any one of the following reasons could be responsible:

  • Open-circuit in controller-should be checked for open starting resistance or open switch or open fuse
  • Low terminal voltage-should be adjusted to name-plate value.
  • Overload-should be reduced if possible otherwise larger motor should be installed.
  • Excessive friction-bearing lubrication should be checked.