Consequences of having P1000 VFD fed from a motor starter instead of a breaker.

[Besoeker]

Gasp! Are you saying that it takes more than one try? My image has been destroyed.

We can work on that.........

What if you have to check the motor rotation before coupling to the load..................
Ever so slightly more seriously, and I can be from time to time, it's usually to check the correct operation of external controls and indication. Field wiring if you like.

 

[FountainGuy]

I thought that all VFDs required short circuit protection? I had a UL shop sometimes use a motor protector (MP) instead of a 3-pole circuit breaker to save cost, but the motor protector sometimes tripped too easily and had to be replaced with a regular breaker. Since then, on new equipment, I requested to not use a MP. I have had several existing pumps (typically 1 to ~20HP), and then add a VFD to the system that had an existing motor starter and MP (two separate devices) and then use a contact from the motor starer to start the VFD. Again, if the motor protector tripped easily (rarely happened though), then it was replaced with a 3P breaker.

 

[Jraef]

I thought that all VFDs required short circuit protection? I had a UL shop sometimes use a motor protector (MP) instead of a 3-pole circuit breaker to save cost, but the motor protector sometimes tripped too easily and had to be replaced with a regular breaker. Since then, on new equipment, I requested to not use a MP. I have had several existing pumps (typically 1 to ~20HP), and then add a VFD to the system that had an existing motor starter and MP (two separate devices) and then use a contact from the motor starer to start the VFD. Again, if the motor protector tripped easily (rarely happened though), then it was replaced with a 3P breaker.

Depends on what you means by "Motor Protector". If by that you mean a "Motor Circuit Protector", which is a Westinghouse trade name for a Instantaneous Trip (Magnetic-Only) circuit breaker, then technically, you cannot legally use those in this application no matter what. They are ONLY allowed in a combination motor starter, which can only be used as a motor controller, not a feeder.