Val3ntin0
Member
- Location
- Houston, TX
Hello, this is my first post after reading these forums for several months but I'm stumped and need some help (just searching didn't help much).
I have a motor that initially during the project was going to be started across-the-line. However, the client convinced the then electrical engineer on the job to add a VFD to it. However, now much later, I'm trying to figure out 1) is the motor compatible with a VFD and 2) how slow can I run the motor without burning it up?
During my investigation I found a 20:1 VT and 10:1 CT rating on the motor nameplate so I'm assuming it's VFD compatible. The motor is for a cooling fan (variable torque) so I'm guessing I should use the 20:1 turndown ratio. This said, does this mean the slowest I can safely run the motor is 180 RPM (23V, 3HZ) without fear of burning it out?
Do I need to check anything in the VFD to make sure it'll handle the load as well?
This is my first go around with motors on VFDs and I have no one to use as a reference at my work place and even the motor vendor wasn't very helpful...HELP!
I have a motor that initially during the project was going to be started across-the-line. However, the client convinced the then electrical engineer on the job to add a VFD to it. However, now much later, I'm trying to figure out 1) is the motor compatible with a VFD and 2) how slow can I run the motor without burning it up?
During my investigation I found a 20:1 VT and 10:1 CT rating on the motor nameplate so I'm assuming it's VFD compatible. The motor is for a cooling fan (variable torque) so I'm guessing I should use the 20:1 turndown ratio. This said, does this mean the slowest I can safely run the motor is 180 RPM (23V, 3HZ) without fear of burning it out?
Do I need to check anything in the VFD to make sure it'll handle the load as well?
This is my first go around with motors on VFDs and I have no one to use as a reference at my work place and even the motor vendor wasn't very helpful...HELP!