Member postings for Martin Turner 4

I have had a quick look for the star connection to see if it can be separated into 3 individual cables but at the moment I can't find it. I can only see two cores that come out the winding and go back in. We have Megger's at work, I work in the engineering department of Southampton docks.

I can check it later with a meter, as the tank also needs to be repaired I may just buy a new 240v single phase setup. As it's a hobby lathe I may not even really use coolant, my old Harrison never had a working suds pump.

The pump is now fully stripped, bearings are fine. The odd thing is I only have 3 cables on my stator and as MG Electic put on there drawing you usually use 6 and wire 240 3ph into Delta.

When you turn the pump on you can see the shaft twitch but it wont spin up even if you help it with a spin from a screwdriver. I have sent some picture to MG Electric and they are going to ask a guy that's been there 50 years about my pump, they basically said the drawings they have show 6 cables unlike the 3 I have, my lathe was built in the 70's from memory.

Also forgot to say my lathe was stored for about 10 years and the suds tank will also need to have some small rust holes repairing. If I can't reconfigure this old pump I may just buy a new 240v single phase system, any recommendations?

Edited By Martin Turner 4 on 18/07/2018 11:07:35

I spoke to MG Electric and they have sent me a drawing but my pump must be odd as it's only got 3 cables coming from the windings instead of 6.

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I un-bolted the insulator block and it only has the 3 cables going to the stator, I did move the links to the Delta position as they were originally across the back in star but now I know there is only 3 cables it wouldn't have made any difference anyway.

As the M300 is a common lathe to put in a 220v 3ph VSD has anyone else had this issue before with there suds pump.

I message Rupert Powell today as I know he has advised a few people on how to convert the M300's to VSD. It appears that the suds pump has only 3 cables coming from the stator so a Delta configuration isn't possible. Rupert sent me this video where a guy managed to get at the star point and convert the stator to a 6 wire Delta setup.

https://www.youtube.com/watch?v=QY5wZytaQ0M

Edited By Martin Turner 4 on 16/07/2018 22:59:45

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HI guys, I have just found time to wire my Invertek VSD into my Harrison M300.

Wired it as A2 to B1, B2 to C1 and C2 to A1, that'll puts it in delta. Connected one phase of the inverter to each of the new connections (C2, A1) (A2, B1) and (B2, C1) and the lathe runs fine.

The suds pump is a different story, changed the links to Delta and linked it in with the 3 motor phases to try it but it's not doing anything, also the suds pump motor only has 3 cables unlike the usual 6.

Any advice will be greatly appreciated.

I ended up getting a Harrison M300 in the end, needs a clean up as it's been in storage for 8 years but atleast all the bare steel parts got oiled up before it was stored.

Just need to decide if I want to run a rotary converter or convert it to a variable speed inverter setup.

According to the guy I spoke to a Transwave yes the rotary converters give a neutral and all 3 phases.

The more I read about these rotary converters I think it's the way I may go, the guy that sold me the lathe had a Transwave rotary converter, it was a shame he wanted to keep it.

I had a chat today with the guys at Transwave and they explained a static converter basically like you said in your post. To future proof my workshop they actually recommended a rotary converter around 5-7hp. My Warco mill hadn't had much use so that's hopefully got life left in it so will probably stay 240v. I would like a bigger compressor so if a nice 3 phase one comes up atleast I can run it if I went the rotary route.

Edited By Martin Turner 4 on 19/12/2017 19:25:43

Thanks guys, I used a M300 when I worked at the railway and to be honest it was fine on a normal 3 phase supply and fixed motor speed. The guy that sold me the lathe used it on a Transwave rotary converter but he wanted to keep it so it wasn't put in with the deal.

Thanks guys, I used a M300 when I worked at the railway and to be honest it was fine on a normal 3 phase supply and fixed motor speed. The guy that sold me the lathe used it on a Transwave rotary converter but he wanted to keep it so it wasn't put in with the deal.

Hi, just bought a M300 lathe and soon I will be looking for a phase converter.

I have looked at the static Transwave's and also our local machine mart has there's on offer, when I spoke to there technical guy he said there static converters only have power on 2 phases and gets the other phase from the motor, is that right?, I thought my lathe would need all 3 phases.

Thanks in advance