montericci
Member
- Location
- Ottawa, IL
Hi all.
I was wondering if there is a rule of thumb for sizing breakers that feed VFDs or Soft Starters that will in-turn operate motors.
I typically spec soft starts to ramp up and down and know that I can limit the current to 150% FLA.
With this in mind I've been specifying the breaker sizes at 150% of FLA or the next size up. I don't have to option to look up the Soft Starter or VFD recommendations as we have to simply state VFD or Soft Starter without being biased in the design. Please help if you can. Thanks
I was wondering if there is a rule of thumb for sizing breakers that feed VFDs or Soft Starters that will in-turn operate motors.
I typically spec soft starts to ramp up and down and know that I can limit the current to 150% FLA.
With this in mind I've been specifying the breaker sizes at 150% of FLA or the next size up. I don't have to option to look up the Soft Starter or VFD recommendations as we have to simply state VFD or Soft Starter without being biased in the design. Please help if you can. Thanks