VFD control from the ELSR
Close
Login to Your Account
Results 1 to 11 of 11
  1. #1
    Join Date
    Jan 2020
    Country
    UNITED STATES
    State/Province
    Texas
    Posts
    11
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    1

    Default VFD control from the ELSR

    My new to me 10EE came completely gutted of all the drive control. I think it was converted from the previous WIAD to a different system in the past. Most of the wiring was in a two inch conduit that must have ran to a external control box. Given the lathes current condition I have opted to install a VFD with an AC motor.

    img_1119-1.jpg

    My intent is to control the spindle direction with the ELSR and the speed with the control knob. I've reviewed several of the previous threads and I've adapted DaveE907's matrix to include the spindle and saddle direction.

    elsr-action.jpg

    Please let me know if something is wrong.

    Once I solve the direction part, I would like to integrate the spindle lock switch into the system; perhaps using the 3rd switch. My schematic calls out a safety switch, but I'm unsure of the function and how it's wired. The VFD is design to stop if it gets conflicting signals, so that might help in the integration.

  2. #2
    Join Date
    Jun 2007
    Country
    UNITED STATES
    State/Province
    Nevada
    Posts
    557
    Post Thanks / Like
    Likes (Given)
    1
    Likes (Received)
    75

    Default

    I accomplished what you are looking to do with my Parker DC drive. Your S? Terminals are obviously different from mine but the goal is the same.

    Set the forward switch (the one in the middle) to forward, the backward (the one at the top) switch to backward, run the common through the spindle lock so if the lock is engaged the common is broken.

    That should accomplish what you need. The switch at the bottom of the ELSR can be used for either NO or NC to control something else you may need.

  3. #3
    Join Date
    Jan 2020
    Country
    UNITED STATES
    State/Province
    Texas
    Posts
    11
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    1

    Default

    Thanks for the input. That sounds like the best approach.

  4. #4
    Join Date
    Sep 2011
    Country
    UNITED STATES
    State/Province
    Virginia
    Posts
    31,242
    Post Thanks / Like
    Likes (Given)
    7561
    Likes (Received)
    9808

    Default

    Quote Originally Posted by Jdub63 View Post
    Thanks for the input. That sounds like the best approach.
    Keep in mind while a 3-P motor on "ordinary" VFD cannot stop anywhere near as fast as a DC motor on a 4Q DC Drive ..

    ...it does not HAVE to do.

    Key to usability of ELSR feature when threading is only that it is very repeatable and predictable as to stopping in almost exactly the same PLACE with each pass, one after the other, after the other.. until done.

    "Consistent" IOW. You should be able to "get there" OK.

  5. #5
    Join Date
    May 2020
    Country
    UNITED STATES
    State/Province
    Indiana
    Posts
    22
    Post Thanks / Like
    Likes (Given)
    4
    Likes (Received)
    2

    Default

    Depending on your VFD model there are probably several ways to accomplish this. You’ll need to dig into the programming/setup manual. I’d suggest finding a few examples in that manual that are closest to your goal. Do you have a vfd in hand? Sounds like you do, but if not, consider that not all vfd’s support a braking resistor, which would give you quicker spindle stop if that matters to you.

  6. #6
    Join Date
    Jan 2020
    Country
    UNITED STATES
    State/Province
    Texas
    Posts
    11
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    1

    Default

    Quote Originally Posted by rabler View Post
    Depending on your VFD model there are probably several ways to accomplish this. You’ll need to dig into the programming/setup manual. I’d suggest finding a few examples in that manual that are closest to your goal. Do you have a vfd in hand? Sounds like you do, but if not, consider that not all vfd’s support a braking resistor, which would give you quicker spindle stop if that matters to you.
    Yes, I have a Hitachi WJ200 matched to a 7.5 HP BlackMax motor. The VFD has provisions for adding a braking resistor if needed. thanks for your input.

    jdub

  7. Likes 220swift liked this post
  8. #7
    Join Date
    Mar 2009
    Location
    Wichita, KS
    Posts
    133
    Post Thanks / Like
    Likes (Given)
    5
    Likes (Received)
    34

    Default

    As thermite says, it's consistency that matters when using the ELSR. Bear in mind, you generally aren't threading at 1500 rpm, so even if it doesn't stop on a dime, it will still stop on a nickel very well. Hard to judge by eye, but I would say, from 300-400 rpm, mine will stop within a 1/4 rotation. At lower rpm, it's faster than that. I would imagine you'd need the external braking resistor to get it to stop that quickly.

    Dave

  9. #8
    Join Date
    Oct 2004
    Location
    Montana
    Posts
    1,095
    Post Thanks / Like
    Likes (Given)
    79
    Likes (Received)
    57

    Default

    Quote Originally Posted by Jdub63 View Post
    Yes, I have a Hitachi WJ200 matched to a 7.5 HP BlackMax motor. The VFD has provisions for adding a braking resistor if needed. thanks for your input.

    jdub
    Let us know how it turns out. Are you doing a how to.

    Hal

  10. Likes TheOldCar liked this post
  11. #9
    Join Date
    Nov 2004
    Location
    SLC, UT
    Posts
    726
    Post Thanks / Like
    Likes (Given)
    959
    Likes (Received)
    151

    Default

    In the Modular drives, the bottom ELSR microswitch provides some safety functions, one of which is to prohibit the drive from being enabled with the control lever in FWD or REV. Earlier drives have the bottom switch implemented in a way that the drive can only be energized with the ELSR Knob in Neutral.

    The top two switches are wired so that they feed each other and FWD can only be energized when REV is open (and vice-versa). This can prevent nasty surprises.

  12. Likes TheOldCar liked this post
  13. #10
    Join Date
    Jan 2020
    Country
    UNITED STATES
    State/Province
    Texas
    Posts
    11
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    1

    Default

    Quote Originally Posted by Colt45 View Post
    Earlier drives have the bottom switch implemented in a way that the drive can only be energized with the ELSR Knob in Neutral.
    This would be an interesting setup, the VFD wouldn't power up unless the switch was in neutral, then once powered that switch would "drop out" and allow you to move the knob to either LH or RH. I see a couple of relays or contactors in the system. I was already planning on using a latching contactor for the start button and Emergency Off.

  14. #11
    Join Date
    Mar 2009
    Location
    Wichita, KS
    Posts
    133
    Post Thanks / Like
    Likes (Given)
    5
    Likes (Received)
    34

    Default

    Most modern vfds can be set up to not engage when power is applied. If the power goes out and comes back up, I have to return the feed control back to of center and then re-engage.


Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •