spahky9000
Member
i want to take my motor up to 70hz thru my vfd i am using a 0 to 10 v signal and i am running in remote thru a plc.
overpeed motor to 70hz thru vfd
- Thread starter spahky9000
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cadpoint
Senior Member
- Location
- Durham, NC
- Occupation
- Electrician - but not by NC Law.
No, a VFD is applied to the service drawn from the call of service!
Frez thru Hz controls this "Setting" or call of service!
Your device is sized for 60Hz service, its not a correct application.
Frez thru Hz controls this "Setting" or call of service!
Your device is sized for 60Hz service, its not a correct application.
- Location
- San Francisco Bay Area, CA, USA
- Occupation
- Electrical Engineer
You can do it, but you will lose torque when you go above base speed. Up to the base speed (60Hz if you are here in N. America), the motor HP increases with frequency, but only up to the maximum rating of the motor because you have to increase voltage AND frequency together. At full speed you are also at full voltage, so if you continue to increase speed (Hz), you have no more voltage and the HP remains the same. Increased speed at a fixed HP equals less torque.
Generally though (and this is a big generalization), you can get away with 70Hz OK because most motors are a little over sized for the application anyway.
Generally though (and this is a big generalization), you can get away with 70Hz OK because most motors are a little over sized for the application anyway.
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