|
Post by Drummond Island Rocks on Mar 14, 2020 11:44:59 GMT -5
I am working a grinder refurb right now and the motor that was on it had a very light duty 2 prong lamp cord. I bought a much better 3 prong cord but when I opened the cover I was a bit confused by the wiring. There are 3 wires coming from the motor (white, black and brown) and two are connected to one cord lead and one to the other. What is the proper way to wire this with a 3 prong cord (white, black and ground)? Thanks Chuck
|
|
rads
spending too much on rocks
Making clay each day!
Member since April 2018
Posts: 318
|
Post by rads on Mar 14, 2020 13:21:48 GMT -5
Black to black, white to "start and run" wires (white and brown in your case) Green should feed up to the screw hole that holds the cover on. There should be a channel for this wire in the casting in the upper right corner of your picture.
|
|
|
Post by Drummond Island Rocks on Mar 14, 2020 15:03:38 GMT -5
Black to black, white to "start and run" wires (white and brown in your case) Green should feed up to the screw hole that holds the cover on. There should be a channel for this wire in the casting in the upper right corner of your picture. Thanks. Seemed like there was usually a green screw or something specific for the ground but grounding to the case sounds right too. Chuck
|
|
|
Post by oregon on Mar 14, 2020 15:24:44 GMT -5
can't tell from your pics, is there still a capacitor attached? older motors tend not to have a dedicated ground screw...
|
|
|
Post by Drummond Island Rocks on Mar 14, 2020 15:34:23 GMT -5
can't tell from your pics, is there still a capacitor attached? older motors tend not to have a dedicated ground screw... No capacitor on this one. If there is not a dedicated spot should I still connect it to the cover screw or just skip the ground and go back to two prong like it was? Chuck
|
|
|
Post by knave on Mar 14, 2020 15:38:17 GMT -5
If you wire it up as it was, connecting ground to the motor case, it will run like it did. The motor is designed to have a start capacitor until it is up to speed. Is there a wiring diagram on the motor itself?
|
|
|
Post by Drummond Island Rocks on Mar 14, 2020 15:58:53 GMT -5
If you wire it up as it was, connecting ground to the motor case, it will run like it did. The motor is designed to have a start capacitor until it is up to speed. Is there a wiring diagram on the motor itself? Good catch on the tag. The motor does not have any hump on it like I am used to seeing on capacitor start motors but it was a running piece of equipment that was being used as it was wired. That sure does not mean it was right though. The motor was used for a two wheel lortone arbor that probably did not require much start up torque but the application I am going to use it for is going to have much more start up resistance. Chuck
|
|
|
Post by knave on Mar 14, 2020 16:16:55 GMT -5
More info is needed. An FZ type motor “may” have an internal switch (centrifugal) to open the start winding, if so..... you could wire the 170mfd capacitor in series with the white wire. I would also like to see a dig ram explaining each terminal on the motor.
|
|
|
Post by Drummond Island Rocks on Mar 14, 2020 16:24:42 GMT -5
More info is needed. An FZ type motor “may” have an internal switch (centrifugal) to open the start winding, if so..... you could wire the 170mfd capacitor in series with the white wire. I would also like to see a dig ram explaining each terminal on the motor. Thanks. No diagram available. Pretty sure I have other motors laying around. Will probably just swap it out or order a new one. Chuck
|
|
|
Post by Drummond Island Rocks on Mar 14, 2020 16:50:42 GMT -5
Crisis averted. I took a look in the attic on my spare parts shelf and came across this motor all wired up. 3/4 HP is better suited for my big saw but for the moment it will work great for the grinder I am working on. Just going to use some extra juice at 11.8 amps. Chuck
|
|
|
Post by oregon on Mar 14, 2020 17:11:54 GMT -5
Good catch on the tag. The motor does not have any hump on it like I am used to seeing on capacitor start motors but it was a running piece of equipment that was being used as it was wired. That sure does not mean it was right though. The motor was used for a two wheel lortone arbor that probably did not require much start up torque but the application I am going to use it for is going to have much more start up resistance. yeah, figured someone had bypassed the startup cap, that's probably the third wire. Doesn't happen to be a wire diagram inside the cover does there? Shouldn't present a crisis. Always hard to pass up $5 & $10 motors and good to have a stash though!
|
|
|
Post by knave on Mar 14, 2020 17:19:45 GMT -5
That’s a good motor Chuck.
|
|
|
Post by Drummond Island Rocks on Mar 14, 2020 17:23:49 GMT -5
That’s a good motor Chuck. Overkill but that's ok for now. If I come across a nice 1/2 HP I'll swap it out and put this one back in storage for a saw. Thanks for the help. Chuck
|
|