Page 2 of 2 FirstFirst 12
Results 16 to 25 of 25
  1. #16
    Join Date
    Nov 2017
    Location
    Geelong, Australia
    Age
    57
    Posts
    2,651

    Default

    Thanks Malb.

    There's actually no trigger switch on this particular one. Just the 2 speed selector switch on the motor itself, and the push button on-off on the front of the machine below the table.

    Probably use the push button switch to signal the VFD start/stop for now to get him going, and then sort out a trigger switch for it.

    Steve

  2. #17
    Join Date
    Oct 2007
    Location
    Alexandra Vic
    Age
    69
    Posts
    654

    Default

    By trigger switch, I was referring to the switch marked 2 on the LHS side of the circuit diag above, can't remember where it was mounted on the Brobo's of 15 years ago, but was at the end of the handle on the Asian units, so convenient to activate motor just before commencing cut. From memory both had the speed select switch on the motor junction box. Ideally trigger switch would be some form of small signal switch rather than a mains switching type to control the VFD, typically switching 5-12V at 5-12mA.
    I used to be an engineer, I'm not an engineer any more, but on the really good days I can remember when I was.

  3. #18
    Join Date
    Nov 2017
    Location
    Geelong, Australia
    Age
    57
    Posts
    2,651

    Default Brobo 2 speed cold saw - what type of motor are they

    I've double checked with him and there's definitely no trigger switch fitted. That diagram was the current one I pulled off the internet - no idea how old this saw is! Its also got a German made motor manufactured by - "Dietz motor". Its a bit of a weird size, the flange has a 130mm PCD and 110 register which matches 110/112 series but the shaft is 24mm diam x 50mm long with 8mm key which matches 90 series.

    Had to do a bit of fettling to modify the motor I have here for the different PCD and register:






    I agree with what you're saying about a more appropriate switch than using the old push button one. I think for a start it I'll grab a network cable to extend the VFD console panel and he can mount that somewhere appropriate to start/stop it with.

    The VFD arrived today, a 1.5kW vector drive Folinn BD600 from Conon Motor on ebay - around $250 delivered.
    Good hard copy English manual of similar standard to Powtran, and very easy setup. Wire it up, set it to vector mode instead of the default V/F, auto-tune and set the min freq and accell/decell times (both defaulted to 10secs).
    We tossed up whether to go for a cheaper one, but in the end decided that having a bricks and mortar store locally to deal with suited him better should there happen to be any issues.

    I just need to wait for this damn head cold and cough to bugger off and our COVID tests from a couple of days ago to come back clear and I can get it over to him! Hopefully on the weekend.

    Steve

  4. #19
    Join Date
    Feb 2012
    Location
    Sydney
    Posts
    67

    Default Fitted a VFD to a Dahlander motor two years ago

    Steve,

    I fitted a Powtran VFD to a Dahlander motor on a band saw two years ago. It's been operating successfully ever since although discovering that it was a Dahlander was quite a journey of discovery. Here's the thread: https://metalworkforums.com/f309/t20...hes-powtran-pi
    My last post in the thread explains what I did in connecting to the VFD.

    Peter

  5. #20
    Join Date
    Nov 2017
    Location
    Geelong, Australia
    Age
    57
    Posts
    2,651

    Default Brobo 2 speed cold saw - what type of motor are they

    Thanks Peter. That Hollandindustrial document is a good reference.

    Have to admit these motors are messing with my head.
    Just to clarify in case I've missed something, you're running a 240v VFD and just connected it up to the low speed (delta) connections on the original 415v motor? You didn't change anything internally in the motor?

    FWIW - this Brobo motor looks like it matches the "constant torque" scenario in the Hollandindustrial document as its Delta for low speed and 2Y for high speed.




    Steve

  6. #21
    BobL is offline Member: Blue and white apron brigade
    Join Date
    Feb 2006
    Location
    Perth
    Posts
    7,182

    Default

    Quote Originally Posted by OxxAndBert View Post
    Thanks Peter. That Hollandindustrial document is a good reference.

    Have to admit these motors are messing with my head.
    Just to clarify in case I've missed something, you're running a 240v VFD and just connected it up to the low speed (delta) connections on the original 415v motor? You didn't change anything internally in the motor?
    At either speed its still a 415V 3P motor. Connected to 240V 3P even on the ∆ setting it will run but you won't get the full power. Then you will risk overloading the motor and it will let out the smoke.

  7. #22
    Join Date
    Nov 2017
    Location
    Geelong, Australia
    Age
    57
    Posts
    2,651

    Default

    Thanks Bob. That was my understanding but from reading Peter’s bandsaw thread it sounded like that’s what he’d done. Hence the question.

    I assume as long as you have the VFD set up with the motor’s original max current setting then the VFD should be able to prevent that overload/overheating situation?

    Steve

  8. #23
    BobL is offline Member: Blue and white apron brigade
    Join Date
    Feb 2006
    Location
    Perth
    Posts
    7,182

    Default

    Quote Originally Posted by OxxAndBert View Post
    Thanks Bob. That was my understanding but from reading Peter’s bandsaw thread it sounded like that’s what he’d done. Hence the question.

    I assume as long as you have the VFD set up with the motor’s original max current setting then the VFD should be able to prevent that overload/overheating situation?

    Steve
    Sure but you get more than about half power.

  9. #24
    Join Date
    Dec 2011
    Location
    Sydney
    Posts
    505

    Default

    Some information on how to set up a 415V 3 phase motor in a 240V v/f VFD:
    https://inverterdrive.com/HowTo/240V...400V-AC-Motor/
    I set up my Arboga like this when I got it, OK at lower speeds but very underpowered at the top of the speed range.

    Bill
    Last edited by WCD; 19th Jul 2020 at 04:21 PM. Reason: added words

  10. #25
    Join Date
    Feb 2012
    Location
    Sydney
    Posts
    67

    Default

    Steve,
    Sorry I didn't see your question earlier. No, I didn't change anything internally in the motor, just connected the VFD to the low speed terminals. I noted BobL's concern about overheating the motor but mine is driving the bandsaw through a worm drive gearbox and I tend to treat my equipment with "Mechanical Sympathy" anyway. Your Brobo is geared down and unless you're doing heavy cutting over a lengthy time period, the overheating risk may be low. A simple hand on the motor to feel its temperature may give you some indication of its loading, the "sniff" test for overheating is not recommended. - Peter

Page 2 of 2 FirstFirst 12

Similar Threads

  1. Motor Speed Controller
    By barkersegg in forum ELECTRICALS
    Replies: 15
    Last Post: 23rd Aug 2018, 08:49 AM
  2. Variable speed motor and controller
    By Jim Ferrous in forum METALWORK GENERAL
    Replies: 5
    Last Post: 24th Sep 2013, 03:03 PM
  3. C & H variable speed motor.
    By clear out in forum METALWORK GENERAL
    Replies: 0
    Last Post: 4th Sep 2012, 02:05 AM
  4. VICTORIA BROBO Cold Saw with bench, rollers and stops
    By ersbruce in forum METALWORK - Machinery, Equipment, MARKET
    Replies: 0
    Last Post: 5th Jun 2012, 02:29 PM
  5. RF-25 Motor Speed
    By Auskart in forum METALWORK GENERAL
    Replies: 2
    Last Post: 15th Jan 2012, 11:32 PM

Posting Permissions

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