Brad93
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- 19,221
- Location
- Essex, United Kingdom
Can someone idiot check this for me?
A friend of mine dropped this tapping drill setup off and I'm trying to assess where the problem lies. It's been rewired in the past and I think it's been done wrong which has burnt the drill out.
It's a Rupes hand drill mounted in a frame and operated on a separate trigger mounted at the end of a long lever.
The Trigger on the drill is latched in normal operation.
I've got live and neutral coming up to the trigger (which is latched on).
The live and neutral go through the trigger then run to the two blue wires disappearing into the windings - I have no continuity on these. Just OL.
I've got two black wires coming out of the windings - these must be one coil as they have continuity 180 ohms.
And a white and a grey wire each going to a brush.
These four wires (White, Grey, Blk, Blk) go back down to the PCB where they are wired up to a DPDT relay (Finder 40.52S) - presumably this is what switches the direction of the drill.
There is no power on the board going to the relay - I surmise the power must go up to the trigger, then through one winding, and back down to the relay?
When I press the forwards or reverse button I've got nothing happening at the drill despite all the relays clicking properly.
What immediately struck me is, I've only got power going up to one winding. And that winding is OL.
I'm not particularly knowledgable on single phase brushed motors.
So it looks like one winding must be burnt out due to being wired up directly with no power going to the other winding or the brushes. Am I correct?
A friend of mine dropped this tapping drill setup off and I'm trying to assess where the problem lies. It's been rewired in the past and I think it's been done wrong which has burnt the drill out.
It's a Rupes hand drill mounted in a frame and operated on a separate trigger mounted at the end of a long lever.
The Trigger on the drill is latched in normal operation.
I've got live and neutral coming up to the trigger (which is latched on).
The live and neutral go through the trigger then run to the two blue wires disappearing into the windings - I have no continuity on these. Just OL.
I've got two black wires coming out of the windings - these must be one coil as they have continuity 180 ohms.
And a white and a grey wire each going to a brush.
These four wires (White, Grey, Blk, Blk) go back down to the PCB where they are wired up to a DPDT relay (Finder 40.52S) - presumably this is what switches the direction of the drill.
There is no power on the board going to the relay - I surmise the power must go up to the trigger, then through one winding, and back down to the relay?
When I press the forwards or reverse button I've got nothing happening at the drill despite all the relays clicking properly.
What immediately struck me is, I've only got power going up to one winding. And that winding is OL.
I'm not particularly knowledgable on single phase brushed motors.
So it looks like one winding must be burnt out due to being wired up directly with no power going to the other winding or the brushes. Am I correct?
