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Electrical Issue with Delta Bandsaw

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Forum topic by Jim1500 posted 10-24-2018 02:15 PM 648 views 0 times favorited 19 replies Add to Favorites Watch
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Jim1500

8 posts in 298 days


10-24-2018 02:15 PM

Hello fellow woodworkers. I am new to the forum and this is my first post. I have been involved with woodworking as a hobby for many years and have recently come across some “older” Delta/Rockwell power tools. I have been assembling the tools and I am having some issues with the bandsaw. This is an older Delta 28-200 14” bandsaw that came with an enclosed Delta/Rockwell base housing. Within the base housing is a 1hp electric motor, and some other electric components that i am learning is probably a magnetic starter. On the outside of the base is a black Rockwell switch with green (on) and red (off) push buttons.

After I assembled everything, I powered the saw up and it ran fine. I turned it on and off several times while tuning the various adjustments on the saw. At one point, after having turned it on and off several times, it would not power back on. I took the switch cover off to check for loose connections but there weren’t any. After putting everything back together, it ran again.

I tried to use it last evening and it came on, I made a cut and turned it off. When I tried to power it up again, it would not come on. I tried unplugging it and plugging it into a different outlet, but that is not the problem. My gut tells me to change the switch but when I looked at it there are (3) wires going to it. I believe I read that this is a “momentary contact switch” used with magnetic starters. Looking around the internet it seems like this is a fairly expensive switch. I don’t mind purchasing one if that is what the problem is but I am not an electrician and I am not familiar with older power tools.

Unfortunately looking on the internet, many of the switches that come up look like the one I have but they do not show the rear of the switch, so I am unable to tell if it would work. They have $15 switches that look similar and $65 switches that look similar. I’m not able to tell which one I would need to get.

I would really appreciate any helpful advice from someone who is familiar with these tools and their electrical workings. Based on what I have described, is there any way to know whether this would be a problem with the switch or could it be the magnetic starter? Is there any process for me to check to find out which component is faulty?

I would appreciate any help here. Otherwise I will have to take the bandsaw off of the base and try to bring it to a motor shop.

Thanks. Jim

-- Jim in Covington, LA


19 replies so far

View MrUnix's profile

MrUnix

7436 posts in 2647 days


#1 posted 10-24-2018 04:32 PM

Just sounds like the switch is at fault…
Can you post a picture of the switch (aka: control station), including the inside?
The switch contacts would be pretty easy to test with a multimeter.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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Jim1500

8 posts in 298 days


#2 posted 10-24-2018 06:06 PM

Brad, thanks for the response. I will take some pictures this evening and post. Looks like it is not easy to find a 110v momentary position switch for a 1hp motor. Best I can find is for a 1/2 hp but I don’t think that will work.

I am going to take switch out and see if there are any markings on it. I don’t believe that it is a Delta original switch.

Thanks,
Jim

-- Jim in Covington, LA

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MrUnix

7436 posts in 2647 days


#3 posted 10-24-2018 07:39 PM

Brad, thanks for the response. I will take some pictures this evening and post. Looks like it is not easy to find a 110v momentary position switch for a 1hp motor. Best I can find is for a 1/2 hp but I don t think that will work.
- Jim1500

If you do have an external starter, which it sounds like you do, then the size of the motor makes no difference – that switch is just for the starters contactor coil – no motor current goes through it. Depending on the starter, the switch is either controlling 24v or 120v with very little current (much less than 1A typically).

Essentially, when you push the normally open “Start” button, it supplies power and energizes the starter coil. When that happens, it not only engages the contacts for the motor, but also secondary contacts for the coil that run through the normally closed “Stop” button to keep the coil energized. When you push the stop button, it opens the circuit, dropping voltage to the coil, and thus to the motor as well.

Depending on what control station you have, you should be able to get to the contacts to verify they are in good condition and give them a good cleaning. I’d also check to make sure all the wiring is tight and you don’t have any loose connections anywhere.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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Jim1500

8 posts in 298 days


#4 posted 10-24-2018 11:24 PM

Ok. Here are some photos to provide a bit more info to the puzzle. I tried to start it just now but no luck. I really don’t know much about electric motors other than hp and rpm. I do know this one is currently wired for 110 volt and has a typical household plug on the cord. It has run well when it did start up. Also, closer inspection reveals it is a 3/4hp motor.

All connections appear tight and I assume the spare wires in the compartment are for wiring for 220 volt?

Jim

-- Jim in Covington, LA

View TDSpade's profile

TDSpade

114 posts in 2864 days


#5 posted 10-25-2018 05:04 AM

I had an after market plug on the end of my electoral cord and a wire came loose in it. just a thought.

-- For every expert, there is an equal and opposite expert.

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Jim1500

8 posts in 298 days


#6 posted 10-25-2018 01:39 PM

Thanks for the suggestion. Unfortunately the plug is molded to the end of the cord. However, that doesn’t mean there isn’t a loose connection at the other end. I think that I may end up having to dismantle all of the wiring and check – redo all of the connections. I was hoping to avoid that!

-- Jim in Covington, LA

View WhyMe's profile

WhyMe

1169 posts in 2009 days


#7 posted 10-25-2018 02:00 PM

I see that the mag starter tag says 3 phase, if the bandsaw is 3 phase it’s not going to work right on single phase current without using a phase converter.

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Jim1500

8 posts in 298 days


#8 posted 10-25-2018 02:11 PM

Yes, I saw that also but there is a box in the upper left corner of the wiring diagram that indicates single phase motors on 115v up to 1.5hp and 230v up to 5hp. I’m out of my realm on this stuff but I read that to mean that single phase could be ok on 115v. I’m not sure but I think that if it had to be 115 volt 3-pjhase power, the plug would have to have 4 prongs?

Hopefully someone who knows more about this than me can respond.

Thanks for the input.

-- Jim in Covington, LA

View Fresch's profile

Fresch

441 posts in 2369 days


#9 posted 10-25-2018 02:14 PM

Looks like the motor is 1phase, unplug it, do you have an ohm meter or continuity tester?

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Jim1500

8 posts in 298 days


#10 posted 10-25-2018 02:16 PM

Yes, I have an ohm meter.

-- Jim in Covington, LA

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Fresch

441 posts in 2369 days


#11 posted 10-25-2018 02:18 PM



Thanks for the suggestion. Unfortunately the plug is molded to the end of the cord. However, that doesn t mean there isn t a loose connection at the other end. I think that I may end up having to dismantle all of the wiring and check – redo all of the connections. I was hoping to avoid that!

- Jim1500


NO! Do not take the wiring apart!
Can you read the wiring diagram?

View WhyMe's profile

WhyMe

1169 posts in 2009 days


#12 posted 10-25-2018 02:18 PM

So the motor is single phase? The big lettering “THREE PHASE MAGNETIC STARTER” is what caught my attention.

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Fresch

441 posts in 2369 days


#13 posted 10-25-2018 02:21 PM



So the motor is single phase? The big lettering “THREE PHASE MAGNETIC STARTER” is what caught my attention.

- WhyMe

Look at the diagram it is also 1phase, 3phase starters, disconnects can be cheaper due to more are produced.

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Jim1500

8 posts in 298 days


#14 posted 10-25-2018 02:30 PM

NO! Do not take the wiring apart!
Can you read the wiring diagram?

- Fresch

I’m not looking to take wiring apart if not necessary! I think I can follow the wiring diagram. Unfortunately I am at work now but I can spend some time on it this evening. Is there something specific to check for?

-- Jim in Covington, LA

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Fresch

441 posts in 2369 days


#15 posted 10-25-2018 04:48 PM

Yes, I’ll get with you tonight, I’m eastern daylight time.

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