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Forum topic by Jim Finn posted 07-14-2014 12:47 PM 763 views 0 times favorited 12 replies Add to Favorites Watch
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Jim Finn

2417 posts in 2390 days


07-14-2014 12:47 PM

Topic tags/keywords: question scroll saw

I have an induction motor on my scroll saw that has a magnetic switch with a capacitor wired into the motor circuit. I want to eliminate this magnetic switch and install a foot switch. I need a step on /step off type switch, not one that has to be held down all the time the saw runs.(I have that switch) I am not sure if the capacitor is a run,start, or start and run capacitor. Any idea on how to rewire this? It is the capacitor in the circuit that has me stumped as to how to wire this to take the magnetic switch out of the saw circuit.

-- "You may have your PHD but I have my GED and my DD 214"


12 replies so far

View bigblockyeti's profile

bigblockyeti

3668 posts in 1188 days


#1 posted 07-15-2014 01:41 PM

Do you have a manual with a wiring schematic or is there one on/in the motor junction box? I’m certain this can be done but can’t offer any advise without a schematic or picture of some kind.

View mpsprunger's profile

mpsprunger

16 posts in 1328 days


#2 posted 07-19-2014 03:12 PM

The capacitor is used to start the motor in the correct direction. The capacitor causes a 90 degree shift in the current/voltage relationship. The current leads the voltage by 90 degrees. Without the capacitor it will sit and hum not knowing whether to turn CW or CCW.

View Jim Finn's profile

Jim Finn

2417 posts in 2390 days


#3 posted 07-19-2014 08:31 PM

No schematic in the manual nor on the machine. I guess I need to take it apart and see how it is wired and make my own sketch.

-- "You may have your PHD but I have my GED and my DD 214"

View TheFridge's profile

TheFridge

5765 posts in 954 days


#4 posted 07-19-2014 08:43 PM

Just a foot switch to turn it on and off?

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View nicksmurf111's profile

nicksmurf111

361 posts in 918 days


#5 posted 07-19-2014 08:52 PM

Does the motor have a built-in overload? If so, there should be a reset button on it. What size is the motor, I’m not sure if they are required on small motors (less than 1/2hp).

Look for a schematic on the side of the motor or inside the wiring plate.

-- Nicholas

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nicksmurf111

361 posts in 918 days


#6 posted 07-19-2014 08:53 PM

Did you purchase a foot swich yet?

-- Nicholas

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Jim Finn

2417 posts in 2390 days


#7 posted 07-19-2014 09:04 PM

I want to use a tap on/ tap off foot switch. I do not want to hold the peddle down while I saw. The magnetic switch that is on the saw now requires a hold it down all the time foot switch. I want to eliminate that magnetic switch and wire in the foot switch I want.

-- "You may have your PHD but I have my GED and my DD 214"

View nicksmurf111's profile

nicksmurf111

361 posts in 918 days


#8 posted 07-19-2014 09:15 PM

Does the motor have a built in overload? Is the contactor seperate from the swich. If so, what make model is the contactor?

-- Nicholas

View TheFridge's profile

TheFridge

5765 posts in 954 days


#9 posted 07-19-2014 09:20 PM

The foot switch you have is a momentary contact switch.

You need a toggle switch. That’s all you need. You may be able to find one that is a direct replacement.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View TopamaxSurvivor's profile

TopamaxSurvivor

17677 posts in 3144 days


#10 posted 07-19-2014 10:12 PM

HI Jim, If you can post a picture of the mag switch and wiring, I can probably tell you what you need to do. Better hurry though, i just retired and I’m trying to forget this stuff ;-))

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View nicksmurf111's profile

nicksmurf111

361 posts in 918 days


#11 posted 07-20-2014 12:54 PM

A momentary contact might just do it, but we need more info first.

-- Nicholas

View Redoak49's profile

Redoak49

1964 posts in 1456 days


#12 posted 07-20-2014 07:20 PM

HF has both type of foot switches and they seem to work well. I have had one for 2 years with no problems.

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