Matt McMillan
Plastic
- Joined
- Jan 11, 2007
- Location
- Berkley, MI
Hello,
I've posted this question at owwm.com and it was suggested that I ask over here as well...
I'm thinking of purchasing an old Whitney No. 134 direct drive double shaper from a friend. It's a nice looking machine - compact, clean, etc. The only hitch is that it came out of a factory that was also running the original frequency converter with it. As it is, the converter was much larger than the shaper it powered...remember that I said I like the small size of the machine!
The motors are both 4 HP rated at 120 cycles, 7200 RPM. I was planning on getting two small, solid state VFDs and using those to get each motor up to speed. I don't fully understand (and I'm OK with being a little in the dark) the process, other than it essentially creates a synthetic sine wave. I understand that some people believe that the process producing the wave can damage the insulation in the windings. I will be using the machine in a one person shop as a hobby, so most people have told me they don't think I'll have any problems with motor damage, but I was hoping to get some feedback from the folks on this site as well.
Now for the questions:
1. Here is the VFD model I was planning on using: SAFTRONICS CV10 COMPACT AC VECTOR DRIVE. MODEL CV102005-9...will it work???
web page
2. Will these VFDs hurt the motors in the shaper?
3. If the motors are already set up to run at 120Hz, what exactly is the VFD doing? I was under the impression that a VFD was used to speed up a motor that was made to run at a different RPM...like make one wired for 1725 rpms go faster/slower...where is my thinking skewed?
Thanks for your help.
Matt
I've posted this question at owwm.com and it was suggested that I ask over here as well...
I'm thinking of purchasing an old Whitney No. 134 direct drive double shaper from a friend. It's a nice looking machine - compact, clean, etc. The only hitch is that it came out of a factory that was also running the original frequency converter with it. As it is, the converter was much larger than the shaper it powered...remember that I said I like the small size of the machine!
The motors are both 4 HP rated at 120 cycles, 7200 RPM. I was planning on getting two small, solid state VFDs and using those to get each motor up to speed. I don't fully understand (and I'm OK with being a little in the dark) the process, other than it essentially creates a synthetic sine wave. I understand that some people believe that the process producing the wave can damage the insulation in the windings. I will be using the machine in a one person shop as a hobby, so most people have told me they don't think I'll have any problems with motor damage, but I was hoping to get some feedback from the folks on this site as well.
Now for the questions:
1. Here is the VFD model I was planning on using: SAFTRONICS CV10 COMPACT AC VECTOR DRIVE. MODEL CV102005-9...will it work???
web page
2. Will these VFDs hurt the motors in the shaper?
3. If the motors are already set up to run at 120Hz, what exactly is the VFD doing? I was under the impression that a VFD was used to speed up a motor that was made to run at a different RPM...like make one wired for 1725 rpms go faster/slower...where is my thinking skewed?
Thanks for your help.
Matt