1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. PLEASE: Read the FORUM RULES BEFORE registering!

    Dismiss Notice
  1. chips&more

    chips&more United States Active User Active Member

    Likes Received:
    1,181
    Trophy Points:
    113
    City:
    Danville
    State:
    California

    -Return to Top-

    I just noticed a better pic of the schematic. And now see it does not have any capacitor(s) in the circuit. I do see a choke, L1, so that brown cylinder thing is probably the choke. Whatever DC motor you try to run with this VSD, note that some DC motors have a permanent magnet field and do not need a DC source for the field. In this situation you just supply DC to the armature and it can be fixed or variable voltage for variable speed. And another note, the armature supply is typically of a higher current demand that the field current…Dave.
     
    4gsr likes this.
  2. 4gsr

    4gsr Global Moderator Staff Member H-M Supporter-Premium

    Likes Received:
    2,101
    Trophy Points:
    113
    Location:
    Victoria, Texas
    City:
    Victoria
    State:
    Texas

    -Return to Top-

    Leave the bridge rectifier alone. Hook it up and see if it runs first. It should handle 1.7 amps easily. Change out the fuse with a 2 amp and don't look back. Old electronics like this are generally oversized a bit for venturous guys like us to piddle with. If it does blow, then put in a larger BRF in. Otherwise, plug it in and giver her a try! What's the worse it's going to do? Give off some magic smoke? This is how you learn about old school electronics.
     
    markba633csi likes this.
  3. 4gsr

    4gsr Global Moderator Staff Member H-M Supporter-Premium

    Likes Received:
    2,101
    Trophy Points:
    113
    Location:
    Victoria, Texas
    City:
    Victoria
    State:
    Texas

    -Return to Top-

    If you use one of them sub fractional HP gear motors, say 1/12 or 1/8 HP, probably work fine. I'd rather spend the extra money and get one of those Severo-feed hook ups to use and not mess with anything else in my opinion. It really doesn't take much torque to turn the crank on the mill to feed a end mill thru a cut. Set up a beam type torque wrench that reads in in/lbs, attach on the nut on the feed screw and turn it to read the torque while feeding it thru a cut. Then work off of that for sizing a gear motor.
     
  4. markba633csi

    markba633csi United States Active Member Active Member

    Likes Received:
    314
    Trophy Points:
    63
    City:
    Mountain View
    State:
    California

    -Return to Top-

    Agree totally with Ken as above. Try a 2 amp fuse and don't look back. Baldor OK Bodine NO
    The speed regulation will not be real good and the low speed torque will drop off somewhat
    Also be careful since the box has no isolation transformer! Make sure you ground the box, and the motor.
    Mark
    ps Lear Siegler isn't that the same Lear that made Learjets?
     
    Last edited: Jun 27, 2017
    4gsr likes this.
  5. ch2co

    ch2co United States Grumpy Old Man H-M Supporter-Premium

    Likes Received:
    417
    Trophy Points:
    63
    Location:
    Mile High Colorado
    City:
    Center of Colorado 5420ft
    State:
    Colorado

    -Return to Top-

    Very Fine Device??
     
    4gsr and woochucker like this.
  6. markba633csi

    markba633csi United States Active Member Active Member

    Likes Received:
    314
    Trophy Points:
    63
    City:
    Mountain View
    State:
    California

    -Return to Top-

    very funny, dummy
     
  7. Lordbeezer

    Lordbeezer United States Active Member Active Member

    Likes Received:
    42
    Trophy Points:
    28
    City:
    Wake forest
    State:
    North Carolina

    -Return to Top-

    Ran the Baldor for awhile with the vSd..nothing got warm..ran 2.25hp 10amp 90v pm motor for about 15 minutes.different speeds.did ok with no load..very smooth. Thanks everyone for your helping me get a little knowledge on this stuff..going to pick up big press from guy that sold me the wanna be vfd..
     
    4gsr, f350ca and hman like this.
  8. 4gsr

    4gsr Global Moderator Staff Member H-M Supporter-Premium

    Likes Received:
    2,101
    Trophy Points:
    113
    Location:
    Victoria, Texas
    City:
    Victoria
    State:
    Texas

    -Return to Top-

    Until you put a load on the motor, you will not know if it will smoke or not.:blowup:
     
    Lordbeezer likes this.
  9. Lordbeezer

    Lordbeezer United States Active Member Active Member

    Likes Received:
    42
    Trophy Points:
    28
    City:
    Wake forest
    State:
    North Carolina

    -Return to Top-

    Heard that...probably gonna use the Baldor gear motor on mill power feed..just had to try the 10 amp motor..thanks
     
    4gsr likes this.

Share This Page