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14th Jul 2020, 01:40 PM #16Most Valued Member
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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
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14th Jul 2020, 06:22 PM #17
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.
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16th Jul 2020, 05:57 PM #18Most Valued Member
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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
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18th Jul 2020, 11:15 AM #19Member
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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
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18th Jul 2020, 11:45 PM #20Most Valued Member
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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
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19th Jul 2020, 08:59 AM #21Member: Blue and white apron brigade
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19th Jul 2020, 12:29 PM #22Most Valued Member
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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
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19th Jul 2020, 02:38 PM #23Member: Blue and white apron brigade
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19th Jul 2020, 03:42 PM #24Golden Member
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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.
BillLast edited by WCD; 19th Jul 2020 at 04:21 PM. Reason: added words
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25th Jul 2020, 06:56 PM #25Member
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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
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