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Richmond Radial Drill wiring?

What terminals do I connect 3phase to?

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hot_anvil15/04/2011 09:08:42
1 forum posts

I have a 1955 Richmond radial drill with Brookhirst switch gear etc. (I'm
based in Baldock, England, UK).
Unfortunately I can't tell you what model etc the drill is. But looking on
the internet it seems to be similar to the SR2.

Please check out images:

I need a wiring diagram or something for the main junction box, so I know
where to connect the incoming 3phase etc. Terminals A, B D and E seem to
be the only ones with nothing connected to them, at least on this side of
the board (can't see behind). But I really don't know where it should go.

Also can anyone tell me what the various components in this box actually
do please?

Any help gratefully received!

Junction box details:
Donovan Electrical, Birmingham B33 9BU (division of Brookhirst Igranic Ltd)
No. AIE114/727
Control Volts: 100/110
Stator Volts: 400/440
H.P.: 3 Max
Phase: 3
Hz: 50

Thanks and regards,

Ronnie Shipman
Les Jones 115/04/2011 10:05:37
2255 forum posts
156 photos
Hi Ronnie,
I can tell you what I think some of the items in the control box are.
Starting at the top left. Below the panel with the the screw terminals and fuses I think there is a transformer from 440 V to 110 volts for supplying the coils on the contactors. (Contactor is just another name for heavy duty relays.) The transformer does look a little on the large size just to supply the coils on the contactors. To the right of this there is a vertical metal panel which looks like it may have some components fixed to it. If this is the case they could be a delay circuit for star/delta starting. The item at the top and just to the right of this panel is a relay. The two square things on the top right look like selenium rectifiers. (If they are they will consist of many metal plates with spacers between them mounted on a threaded rod.) The other four items look like contactors. As there a four I suspect the motor may be a two speed type. (Only two contactors would be required for the star/delta starter.) I would not suggest connecting the supply to the terminals A, B, D without getting someone to trace out the wiring diagram. The two fuses are probably for the transformer so the non transformer end of these should go directly to two of the incoming phases You will probably find this end of the fuses go to two of the three sets of contacts on one or more of the contactors. If there are more than three sets of contacts used on the contactors then some will be connected to the control wiring and hence eliminated from the three phase wiring. I suspect you will need someone with electrical knowledge to help you. I live about 200 miles from you so I cannot offer to help. I must complement you on providing enough information (Including you location.) to enable people to try to help you.

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