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View Jim1500's profile

Electrical Issue with Delta Bandsaw

by Jim1500
posted 10-24-2018 02:15 PM


19 replies so far

View MrUnix's profile

MrUnix

7388 posts in 2593 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

View Jim1500's profile

Jim1500

8 posts in 244 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

View MrUnix's profile

MrUnix

7388 posts in 2593 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

View Jim1500's profile

Jim1500

8 posts in 244 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

111 posts in 2810 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.

View Jim1500's profile

Jim1500

8 posts in 244 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

1153 posts in 1955 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.

View Jim1500's profile

Jim1500

8 posts in 244 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

433 posts in 2315 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?

View Jim1500's profile

Jim1500

8 posts in 244 days


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

Yes, I have an ohm meter.

-- Jim in Covington, LA

View Fresch's profile

Fresch

433 posts in 2315 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

1153 posts in 1955 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.

View Fresch's profile

Fresch

433 posts in 2315 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.

View Jim1500's profile

Jim1500

8 posts in 244 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

View Fresch's profile

Fresch

433 posts in 2315 days


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

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

View MrUnix's profile

MrUnix

7388 posts in 2593 days


#16 posted 10-25-2018 06:24 PM

That looks like a pretty typical NEMA starter, and the wiring diagram indicates that is a LVC (low voltage) type, using a 24v control voltage for the coil. It can be used for both single and three phase machines… for single phase, you just don’t use the T3/L3 connections.

As for troubleshooting… start with the easy stuff. Make sure the overload isn’t tripped (it is a manual reset – red button near the heaters). Then verify you have your 24v control voltage, and try to bypass the switch to see if it fires up (jumper the red and black wires as per the diagram):

You can also manually engage the contactor to see if the motor will fire up… you should be able to push down on the contact points to apply power to the motor.

Cheers,
Brad

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

View Fresch's profile

Fresch

433 posts in 2315 days


#17 posted 10-25-2018 09:31 PM

What he said.
It ran so you may have start/stopped too many times. Can you look at the heater (white thing under the red reset) check the number to the chart to the motor fla on the name plate.
Heater #Exxx amp, range x-x, fla of motor x-x make sure it is correct for 120volt amp value.

View Jim1500's profile

Jim1500

8 posts in 244 days


#18 posted 10-26-2018 02:07 AM

Success!! Going through the troubleshooting, I jumped the switch and the motor came on. Luckily the switch was held together with screws and I was able to take it apart. Cleaned the contact points and put it back together. Got good continuity so wired it back to saw and it worked. Putting the switch back together was hardest part. Lots of contacts and springs to hold together until the housing got back on.

Thanks to everyone for all the advice, especially you MrUnix! You nailed from the start saying the switch contacts were probably dirty.

Now on to re-assembling my 6” jointer. It was completely submerged for several weeks during a flood. Had to completely dismantle to deal with rust. That part is done so I will start reassembly soon. That should be fun!

Thanks again for all the help! I was really lost with that magnetic starter.

-- Jim in Covington, LA

View MrUnix's profile

MrUnix

7388 posts in 2593 days


#19 posted 10-26-2018 05:36 AM

Glad you got it working – now go make some sawdust :)

Cheers,
Brad

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

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