Help

Status
Not open for further replies.
iaov

iaov

Senior Member
Location
Rhinelander WI
Was asked by a customer to make a pendant control for a Milwaukee Frame drill. He wants to be able to start the motor and have it stay running in forward and be able to jog it in reverse. I thought no problem a simple motor control circuit with a relay. When I took the drill apart I found that the neutral is switched to control directions and there are three wires for this.The direction switch is layed out like this.

A. Black/ Neutral B. Red


C. White D. Yellow
In the forward posistion A is shorted to C.
In the reverse posistion A is shorted to B and C and D are shorted together. Can any one tell me whats goin on here. Thanx!!:smile:
 
iaov said:
He wants to be able to start the motor and have it stay running in forward and be able to jog it in reverse.
Click to expand...

He wants to jog the motor in reverse while it is running? Kind of like putting your transmission in reverse while going down the road at 40 MPH?

I must be misunderstanding what you are saying.
 
hardworkingstiff said:
He wants to jog the motor in reverse while it is running? Kind of like putting your transmission in reverse while going down the road at 40 MPH?

I must be misunderstanding what you are saying.
Click to expand...
Its going to have a stop button and I was going to use a normaly closed contact as part of the path for reverse.I was planning on using a typical four wire motor control relay circuit for forward . I just don't understand how this motor reverses direction as my knowlege of motors is lacking in thia area.
 
iaov said:
Its going to have a stop button and I was going to use a normaly closed contact as part of the path for reverse.I was planning on using a typical four wire motor control relay circuit for forward . I just don't understand how this motor reverses direction as my knowlege of motors is lacking in thia area.
Click to expand...
Great minds think alike glad you cleared this up :)

Only because you said the instant reverse did I think of my yard tools!
B & D, maybe its there motor wiring but I do recall a near instant stop of motor rotation once the active handle is released.
Frankly it's more noticable on the mower...

Maybe one of there diagrams is out there ...
 
Glad my thinking is in line with another great mind.:D I tried looking to see if I could find a schematic but have struck out so far. My guess is that the polarity of the starting windings is being changed. I was hoping some one on the forum would jump in with a schematic or an explanation.:smile:
 
Well the right hand rule does come to mind ! You sure only the neutral is being switched?
 
iaov said:
A. Black/ Neutral B. Red


C. White D. Yellow
In the forward posistion A is shorted to C.
In the reverse posistion A is shorted to B and C and D are shorted together. Can any one tell me whats goin on here. Thanx!!:smile:
Click to expand...
There must be wires you're not telling us about.

Where does each line conductor connect? Where does each motor conductor connect?
 
LarryFine said:
There must be wires you're not telling us about.

Where does each line conductor connect? Where does each motor conductor connect?
Click to expand...
There are two switches on this beast. The trigger switch is a two pole single throw. Switches the hot to a wire disappearing in the motor and switches the neutral to the for/rev switch wich switches as I put in the first post.There are four wires going into the drill. A black, a white, a red, and a yellow.The black is hot any time the trigger is pulled. I wish I knew how to draw pictures on this forum or even better post photographs.:confused:
 
First of all, I'd ignore the hot/neutral discussion, since it doesn't matter to the motor. It could be 115v or 230v.

It sounds like a series or compound motor that swaps polarity on either the armature (brushes) or the field.

Does this motor have brushes? Also, when the F/R switch is in FWD (A-to-C), are B and D also shorted?
 
LarryFine said:
First of all, I'd ignore the hot/neutral discussion, since it doesn't matter to the motor. It could be 115v or 230v.

It sounds like a series or compound motor that swaps polarity on either the armature (brushes) or the field.

Does this motor have brushes? Also, when the F/R switch is in FWD (A-to-C), are B and D also shorted?
Click to expand...
No brushes Larry and you are right B to D are shorted in forward. Didn't get home till late last night(buisness has realy picked up the last couple of weeks)but set it up on the bench and think I have a way to make this work with a couple of relays. Thanx for your help.:smile:
 
iaov said:
No brushes Larry and you are right B to D are shorted in forward. Didn't get home till late last night(buisness has realy picked up the last couple of weeks)but set it up on the bench and think I have a way to make this work with a couple of relays. Thanx for your help.:smile:
Click to expand...
Okay, that means the reversing switch is your basic DPDT switch wired as a reversing switch, like a 4-way toggle. In fact, you could use a 4-way switch or a single DPDT relay.

Lemme know if you want more help.
 
LarryFine said:
Okay, that means the reversing switch is your basic DPDT switch wired as a reversing switch, like a 4-way toggle. In fact, you could use a 4-way switch or a single DPDT relay.

Lemme know if you want more help.
Click to expand...
Thanx for the help Larry. Always nice to hear from this forums most censored member.:smile:
 
Status
Not open for further replies.
Top