Harrison wiring

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

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?

Martin C

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.

Andrew

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.

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.

**LINK**

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**

Ha, great minds, Gray found the same diagram while I was typing my reply

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.

Andrew

Sorry to bring up an old post but I’m having the same problems did you manage to solve it in the end?

Alwyn, this type of problem is often caused by mechanical shock during transit which has caused the switch in the starter/contactor overloads to jump out, power off, and try to find the reset button in the starter. Hope this helps

Phil.