Output Phase Loss

What does Output Phase Loss mean?

One or more phases on the drive's output to the motor are disconnected, the motor winding is damaged, or connections are loose at the drive output terminals. This can also occur if the motor is too small (drawing less than 5% of the drive's rated current), leading to unbalanced currents and potential motor heating.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Verify that the motor's rated current is at least 5% of the drive's rated output current; ensure proper motor and drive sizing.

2. 4

   Check for any external contactors or switching devices on the drive's output that might inadvertently open a phase.