LumberJocks

Powermatic 66 starting problem

  • Advertise with us

« back to Power Tools, Hardware and Accessories forum

Forum topic by Rwisland posted 06-21-2021 11:08 AM 404 views 0 times favorited 23 replies Add to Favorites Watch
View Rwisland's profile

Rwisland

7 posts in 44 days


06-21-2021 11:08 AM

Topic tags/keywords: powermatic 66 starting problem

Greetings, I have a Powermatic 66 table saw that wont start. When I press the start button all I get is a loud humming sound from the motor trying to start. My saw is set up for 120 volts. It is using a Telemecanique a202c starter. I am getting proper voltage to the switch but only 98 volts leaving the switch to the motor when the start button is pressed. Is it safe to say that the starter switch is bad? Any insight would be greatly appreciated. Thank you


23 replies so far

View dbw's profile (online now)

dbw

573 posts in 2801 days


#1 posted 06-21-2021 11:45 AM

I am not familiar with starter switches but I can tell you 98 volts is not enough to power a 120V motor.

-- Woodworking is like a vicious cycle. The more tools you buy the more you find to buy.

View Kudzupatch's profile

Kudzupatch

249 posts in 2373 days


#2 posted 06-21-2021 02:18 PM

Never measured voltage when it happens but it has all the signs of a bad start capacitor on the motor.

If you could safely spin the motor and then hit the start switch with it spinning that would tell you for sure. If it spins up in is the start cap.

If you can’t I would start by replacing it. They are not very expensive and it is an easy job. Odds are good it is your problem.

-- Jeff Horton * Kudzu Craft skin boats* www.kudzucraft.com

View splintergroup's profile

splintergroup

5484 posts in 2387 days


#3 posted 06-21-2021 03:47 PM

Yep, start cap or possibly the motors internal centrifugal switch is packed with sawdust.

View Rwisland's profile

Rwisland

7 posts in 44 days


#4 posted 06-21-2021 04:13 PM

I removed motor housing and blew out any saw dust (its wasn’t really dirty). I find it strange that I am only getting 98 volts through the switch.

I jumped the switch and still no joy.

View Rwisland's profile

Rwisland

7 posts in 44 days


#5 posted 06-21-2021 04:16 PM

Would you replace the motor or just the capacitor? Where on the motor is the capacitor? I am running a 3HP 1phase Baldor motor. Thanks for all the help.

View Kudzupatch's profile

Kudzupatch

249 posts in 2373 days


#6 posted 06-21-2021 05:41 PM

A cap is $10 or less. A motor is $300+. I think the answer is obvious.
Besides Baldor is one of the best motors out there. Not like some Tiwanesse cheap made motor.

Cap should be under a cover on the outside of the motor. A big hump, thin metal cover with a couple of screws holding it. Pull it out and look for the a number followed by mfd. You want to find one the same or small diameter and with a mfd and voltage rating the same or larger. Just don’t go smaller.

It really is easy to fix.

-- Jeff Horton * Kudzu Craft skin boats* www.kudzucraft.com

View splintergroup's profile

splintergroup

5484 posts in 2387 days


#7 posted 06-21-2021 05:42 PM

The cap is usually located under a (hump) cover on the side of the motor. If there are start and run caps, there may be two covers.

With there being little sawdust in the motor, the cap is the next to check out. Pull the cover and check if the cap is bulged or leaking.

View greenacres2's profile

greenacres2

367 posts in 3333 days


#8 posted 06-21-2021 05:54 PM

Seems like that 3 hp Baldor should be on a 240 volt circuit, but you mentioned 120. Do both legs of that circuit say the same ?
Earl

View BlasterStumps's profile

BlasterStumps

2074 posts in 1604 days


#9 posted 06-21-2021 06:16 PM

I don’t see any mention of the capacitor charge that could be present. I would recommend shunting the two terminals with an insulated tool like a plastic handled screwdriver. Before disconnecting the leads. And I recommend making sure the saw is unplugged before doing any work on motor.

-- "I build for function first, looks second. Most times I never get around to looks." MIke in CO

View Rwisland's profile

Rwisland

7 posts in 44 days


#10 posted 06-21-2021 06:42 PM

I checked both capacitors and they within limits.

View MrUnix's profile

MrUnix

8693 posts in 3364 days


#11 posted 06-21-2021 08:56 PM

Starter wired for 120v but motor wired for 240v? Never seen a PM66 with a 3hp motor that would run on 120v. That would require a huge circuit breaker and wiring.

Cheers,
Brad

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

View Rwisland's profile

Rwisland

7 posts in 44 days


#12 posted 06-21-2021 10:06 PM

I believe the motor was wired for 120v- It has been running in this orientation for 11 years when the saw was acquired.

View BlasterStumps's profile

BlasterStumps

2074 posts in 1604 days


#13 posted 06-21-2021 10:41 PM

50 Amp single pole breaker?

-- "I build for function first, looks second. Most times I never get around to looks." MIke in CO

View CaptainKlutz's profile

CaptainKlutz

4691 posts in 2659 days


#14 posted 06-21-2021 10:52 PM


I believe the motor was wired for 120v- It has been running in this orientation for 11 years when the saw was acquired.

- Rwisland

+1 Highly doubt you have a 120v motor.

A 3HP motor has a 34 amp FLC and would required a min 40 amp 115v circuit to run, and a 50A breaker to met NEC code. It is extremely rare to find a 3HP motor that runs on 120v single phase? Never seen one on a PM66 either.

Reminded of rules from OWWM forums:

OWWM Rule No. 12: Never assume a machine as received is set up correctly.

I have seen many machines where the previous owner used a 120v plug and wired the outlet for 240v. Can even test machine, and not realize that the machine is running on 240v power behind the 120v plug. Some folks don’t know better, or are too cheap/lazy to buy the proper plug.

Can verify the motor rating:
What does motor name plate show?

Another way to check is starter coil voltage:
If it has a 24v transformer inside, what is the input voltage setting?
What is voltage rating on the magnetic starter coil?
The Telemecanique a202c is partial PN. The whole PN has numbers after the C to designate the coil voltage.

Best Luck.

-- If it wasn't for bad luck, I wouldn't have no luck at all, Doom, despair, agony on me… - Albert King - Born Under a Bad Sign released 1967

View Rwisland's profile

Rwisland

7 posts in 44 days


#15 posted 06-21-2021 10:56 PM

I’ll take some pics of the motor plate- It is a Baldor- 3hp Voltage coming into the starter is 120v. There are no more numbers after the A202C

showing 1 through 15 of 23 replies

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com