Need help with wiring my new Harrison in
|Phil Lambley||24/05/2019 23:24:57|
|3 forum posts|
Hi guys I’m new here and looking for some wiring info for a Harrison 300 3 phase machine
I’ve recently bought this and the guy showed my a video of it working before it was in wired from his supply
I’ve now got it back to my workshop were I have 3 phase and wired it in as I think it should be but won’t work , the dro and lubrication pump is working but the motor won’t engage using the levered etc ,
the only way I can get the motor to spin up is by pressing the contractors in with a screwdriver , the rocker switches on the end of the lever all seem to be working etc, when I wired this in in the isolated box ther was a red /blue /yellow cable and an earth fastened to the side of the box so I’ve wired the 3 colour to L1/L2/L3 and earth to the terminal , ther doesn’t seem to be anywer for the neutral to go ? Also ther is a small blue wire run in to the box that’s not connected as I’m. It shire what to put it too but it runs into the machine to what looks to be a 415-110 transformer
any help really appreciated guys
|Martin Connelly||25/05/2019 07:37:04|
847 forum posts
A couple of things need to be known to help with answers.
Are there any covers or safety screens with switches that need to be in the safe position to enable operation?
Was it supplied by 3 phase mains at 415 line volts or a VFD at 240 line volts and what are you supplying to it?
|Andrew Johnston||25/05/2019 07:43:23|
4780 forum posts
Many industrial machine tools do not use, or need, neutral. In theory a three phase motor running in star has no net current flow to or from the star point. So there's no point in providing a neutral. If a 230V rail is needed internally it comes from a transformer connected across two phases.
I don't have a lubrication pump on my M300? The coolant pump runs separately from the main motor, controlled by a push button panel on the headstock end.
I'd double check the mechanical linkage from the saddle lever to the electrical box. I've had issues with mine; the levers might move, but any slack means they don't move enough to operate the contactors.
|999 forum posts|
Here's a wiring diagram for the M300.
That transformer is most likely the one that sits in the contactor coil/interlock circuit. But, there is also another transofrmer in the diagram for the machine lamp. You need to identify these and ensure they are correctly connected. as per the diagram below if you are running the machine from a 415 3 phase supply.
|Phil Lambley||25/05/2019 07:51:56|
|3 forum posts||
|272 forum posts|
I had a quick google, it looks like some Harrison 300 lathe uses a 110V transformer to power all the switch gear. If so not connecting the transformer means it will never run.
If this is the same lathe as yours, the transformer should be connected to terminal block Z1 terminals 4 and 5.
The question will be why is the blue wire loose? has the wiring been bodged or was it just accidentally pulled out when the mains cable was removed.
Dont worry about the neutral. With 3 phase there are two ways to use it called star and delta. This link has a reasonable explanation **LINK**
|272 forum posts|
Ha, great minds, Gray found the same diagram while I was typing my reply
|Andrew Johnston||25/05/2019 09:21:52|
4780 forum posts
The microswitches operated by the saddle lever should have 110VAC on one side.
Is the emergency stop button on the headstock end enabled? It should be push to stop and then twist to unlock.
Please login to post a reply.
Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!
You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.
Click THIS LINK for full contact details.
For subscription issues please see THIS LINK.