MountaineerMiner
Aluminum
- Joined
- Feb 8, 2013
- Location
- Northeast Tennessee
I am finishing up a VFD install on a Howa Sangyo 1500 and looking for advice on the 2-speed motor wiring “best practice”. I am not looking for a how to or a what is easiest, but what is the best way to tackle the 2-speed motor or what are the cons and benefits of the 2 options?
The VFD used is a Fuji Frenic Micro drive and is 2 motor capable. I currently have all the external controls properly wired including the foot brake coast to stop and hand brake decelerate to stop thanks to some posts by Motion Guru and JST. The motor being driven is a Fuji MRA 2135A if that means anything; it is a 2.8/5.5 kW 8/4 pole dual voltage 2 speed motor with a thermister. I currently have the VFD wired to the high-speed windings and achieve the low-speed setting using the multistep frequency commanded to 30hz through the x3 terminal.
Reading other posts, it seems this is the common way to wire a motor such as this, but I have not read much about the other option; using the 2-motor function of the drive to power a set of contactors connected to both the high and low speed windings. I understand I will see the same motor power at 30hz on the high windings as 60hz on the lower windings, but is there any other benefit to running the low windings at 60hz vs the high windings at 30hz?
My biggest interest in this configuration is that at the factory carrier frequency setting of 2khz the sound at 30hz motor speed is pretty terrible. When maxed out to 16khz carrier frequency it is much better but still noticeable without much gain beyond 12khz, where I currently have it set. At 60hz motor speed the carrier frequency does not make much difference, it is relatively quiet across the range when running both the low speed and high-speed windings. The other benefit I can see is being able to set distinct motor parameters and accel/decel speeds; currently it is just half that of the 60hz settings. I already have the contactors, so hardware is not a consideration.
Also, is 12khz a "motor safe" carrier frequency? I have not found a clear answer to this other than too low can cause more issue than too high as far as the motor is concerned, the neighbors ham radio be damned.
Thanks
Mike
The VFD used is a Fuji Frenic Micro drive and is 2 motor capable. I currently have all the external controls properly wired including the foot brake coast to stop and hand brake decelerate to stop thanks to some posts by Motion Guru and JST. The motor being driven is a Fuji MRA 2135A if that means anything; it is a 2.8/5.5 kW 8/4 pole dual voltage 2 speed motor with a thermister. I currently have the VFD wired to the high-speed windings and achieve the low-speed setting using the multistep frequency commanded to 30hz through the x3 terminal.
Reading other posts, it seems this is the common way to wire a motor such as this, but I have not read much about the other option; using the 2-motor function of the drive to power a set of contactors connected to both the high and low speed windings. I understand I will see the same motor power at 30hz on the high windings as 60hz on the lower windings, but is there any other benefit to running the low windings at 60hz vs the high windings at 30hz?
My biggest interest in this configuration is that at the factory carrier frequency setting of 2khz the sound at 30hz motor speed is pretty terrible. When maxed out to 16khz carrier frequency it is much better but still noticeable without much gain beyond 12khz, where I currently have it set. At 60hz motor speed the carrier frequency does not make much difference, it is relatively quiet across the range when running both the low speed and high-speed windings. The other benefit I can see is being able to set distinct motor parameters and accel/decel speeds; currently it is just half that of the 60hz settings. I already have the contactors, so hardware is not a consideration.
Also, is 12khz a "motor safe" carrier frequency? I have not found a clear answer to this other than too low can cause more issue than too high as far as the motor is concerned, the neighbors ham radio be damned.
Thanks
Mike