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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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motor start capacitor
Hi all,
I'm home for the holidays and I was trying to quiet a noisy garage door opener by greasing the pivots and mechanical parts of the motor. Well, unfortunately, it looks like I got a bit of grease on the motor as well. When I turned it on after greasing it, there was a quick puff of black smoke... after which everything worked just fine for an hour or two. Then it stopped working and I found that a big huge capacitor had blown open and leaked a bunch of oily goo. This is a big "AeroM PSU6430" 64 microF 330VAC capacitor with spade-type terminals. I believe nothing else is wrong with the door opener, since the light comes on and I hear a relay click when I push the button, and the hum of a transformer, but the motor simply doesn't start. Does anyone have an idea where I can buy a replacement for such a capacitor? I couldn't find a clearly compatible part at Digikey, and local electronics and hardware places have been no help. Thanks for any help! Dan Lenski |
#2
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motor start capacitor
Dan Lenski wrote:
Hi all, I'm home for the holidays and I was trying to quiet a noisy garage door opener by greasing the pivots and mechanical parts of the motor. Well, unfortunately, it looks like I got a bit of grease on the motor as well. When I turned it on after greasing it, there was a quick puff of black smoke... after which everything worked just fine for an hour or two. Then it stopped working and I found that a big huge capacitor had blown open and leaked a bunch of oily goo. This is a big "AeroM PSU6430" 64 microF 330VAC capacitor with spade-type terminals. I believe nothing else is wrong with the door opener, since the light comes on and I hear a relay click when I push the button, and the hum of a transformer, but the motor simply doesn't start. Does anyone have an idea where I can buy a replacement for such a capacitor? I couldn't find a clearly compatible part at Digikey, and local electronics and hardware places have been no help. Thanks for any help! Dan Lenski Just look in the yellow pages for 'electric motors' or 'electrical wholesaler'. They are quite common. http://www.cpcares.com/capacitors/index.html |
#3
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motor start capacitor
You should have a local W.W. Grainger Company branch office. If not it
can be ordered online at www.grainger.com and here is the info: Stock # 4CU62 Motor Start capacitor, 64 UF @ 330VAC $8.32 An electric motor shop may also be able to sell you a replacement cap. Just bring the old one with you. |
#4
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motor start capacitor
Ken Layton wrote:
You should have a local W.W. Grainger Company branch office. If not it can be ordered online at www.grainger.com and here is the info: Stock # 4CU62 Motor Start capacitor, 64 UF @ 330VAC $8.32 An electric motor shop may also be able to sell you a replacement cap. Just bring the old one with you. Excellent!!! We do have Grainger here, in fact they sponsor our local Minor League Baseball team. Thanks a ton, Ken. Dan |
#5
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motor start capacitor
So I've verified that the Lansing, MI grainger carries this capacitor
and I can buy one on Tuesday. Woohoo! In the mean time I've found that the motor will actually run fine provided I give it a nudge to get it started. I guess the whole purpose of the capacitor is to start the electric motor? How does that work? I don't actually understand how a single-phase AC current can turn a motor at all... since there's no rotating magnetic field. Anybody know of a good reference on how an AC motor works? Dan |
#6
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motor start capacitor
Dan Lenski wrote:
So I've verified that the Lansing, MI grainger carries this capacitor and I can buy one on Tuesday. Woohoo! In the mean time I've found that the motor will actually run fine provided I give it a nudge to get it started. I guess the whole purpose of the capacitor is to start the electric motor? How does that work? I don't actually understand how a single-phase AC current can turn a motor at all... since there's no rotating magnetic field. Anybody know of a good reference on how an AC motor works? Dan The motor has two windings, one of them has the capacitor in series with it to give a phase shift with respect to the other ! Note if you want to reverse the motor apply power across the other side of the cap. I--@@@@--- L2 I I L1---I Cap I I I--@@@@--- L3 -- Best Regards: Baron. |
#7
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motor start capacitor
"Dan Lenski" wrote in message ps.com... I'm home for the holidays and I was trying to quiet a noisy garage door opener by greasing the pivots and mechanical parts of the motor. Well, unfortunately, it looks like I got a bit of grease on the motor as well. When I turned it on after greasing it, there was a quick puff of black smoke... after which everything worked just fine for an hour or two. Then it stopped working and I found that a big huge capacitor had blown open and leaked a bunch of oily goo. Coincidence. It wasn't the grease. |
#8
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motor start capacitor
"Dan Lenski" wrote in message ups.com... So I've verified that the Lansing, MI grainger carries this capacitor and I can buy one on Tuesday. Woohoo! In the mean time I've found that the motor will actually run fine provided I give it a nudge to get it started. I guess the whole purpose of the capacitor is to start the electric motor? How does that work? I don't actually understand how a single-phase AC current can turn a motor at all... since there's no rotating magnetic field. Anybody know of a good reference on how an AC motor works? Google for (permanent split phase capacitor motor). |
#9
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motor start capacitor
"Dan Lenski" wrote in message ps.com... Hi all, I'm home for the holidays and I was trying to quiet a noisy garage door opener by greasing the pivots and mechanical parts of the motor. Well, unfortunately, it looks like I got a bit of grease on the motor as well. When I turned it on after greasing it, there was a quick puff of black smoke... after which everything worked just fine for an hour or two. Then it stopped working and I found that a big huge capacitor had blown open and leaked a bunch of oily goo. This is a big "AeroM PSU6430" 64 microF 330VAC capacitor with spade-type terminals. I believe nothing else is wrong with the door opener, since the light comes on and I hear a relay click when I push the button, and the hum of a transformer, but the motor simply doesn't start. Does anyone have an idea where I can buy a replacement for such a capacitor? I couldn't find a clearly compatible part at Digikey, and local electronics and hardware places have been no help. Was that graphite grease? How much did you get on the motor/electrical contacts? Seems a bit strange! |
#10
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motor start capacitor
Homer J Simpson wrote:
Coincidence. It wasn't the grease. Thanks for relieving my guilty conscience :-) I was beginning to suspect the same... though it's darned uncanny that it blew immediately after I greased the mechanical parts. Once I disassembled the door opener, I realized the capacitor was hardly in a position to have gotten any grease on it. I looked up the service life of the capacitor and it's about 16k cycles... meaning it would last about 12 years if cycled 4 times a day (mom leaves in morning, dad leaves in morning, mom comes back, dad comes back). And it's definitely at least 20 years old. Dan |
#11
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motor start capacitor
Charles Schuler wrote:
Was that graphite grease? How much did you get on the motor/electrical contacts? Seems a bit strange! It was white lithium grease. Not conductive. I use it on bearings in bicycles and lab equipment all the time, so I figured it would work fine on the garage door pivots and the bearings in the motor. When I sprayed it inside the motor housing, I tried to carefully aim it only at the mechanical bearings, and NOT at the electrical contacts. I agree that it's very strange, but the coincidence seems very unlikely. Although the capacitor was evidently nearing the end of its service life in any case (16k cycles). Dan |
#12
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motor start capacitor
"Dan Lenski" writes:
Charles Schuler wrote: Was that graphite grease? How much did you get on the motor/electrical contacts? Seems a bit strange! It was white lithium grease. Not conductive. I use it on bearings in bicycles and lab equipment all the time, so I figured it would work fine on the garage door pivots and the bearings in the motor. When I sprayed it inside the motor housing, I tried to carefully aim it only at the mechanical bearings, and NOT at the electrical contacts. I agree that it's very strange, but the coincidence seems very unlikely. Although the capacitor was evidently nearing the end of its service life in any case (16k cycles). I'm not convinced that it's a coincidence. If you really sprayed grease inside the motor, you may have gotten it on the contacts of the centrifugal switch that is supposed to interrupt the circuit to the start cap once the motor gets up to speed. If the start cap remains energized for more than the time needed to start, it will do exactly what you describe quite quickly. So, at the very least, you should check the AC voltage on the start cap using a meter that reads only AC (not the DC omponent). It should go to 0 VAC once the motor is turning at normal speed. If not, you'll have to disassemble the motor and determine what's going on. And have your safety goggles on while doing it! --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#13
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motor start capacitor
"Dan Lenski" wrote in message oups.com... Thanks for relieving my guilty conscience :-) I was beginning to suspect the same... though it's darned uncanny that it blew immediately after I greased the mechanical parts. Don't you hate when that happens? |
#14
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motor start capacitor
"Sam Goldwasser" wrote in message ... I'm not convinced that it's a coincidence. If you really sprayed grease inside the motor, you may have gotten it on the contacts of the centrifugal switch that is supposed to interrupt the circuit to the start cap once the motor gets up to speed. Unlikely they use such a motor - more likely a PSC motor with no such switch. Easy to reverse at speed and there is no great starting load. |
#15
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motor start capacitor
Sam Goldwasser wrote:
I'm not convinced that it's a coincidence. If you really sprayed grease inside the motor, you may have gotten it on the contacts of the centrifugal switch that is supposed to interrupt the circuit to the start cap once the motor gets up to speed. If the start cap remains energized for more than the time needed to start, it will do exactly what you describe quite quickly. So, at the very least, you should check the AC voltage on the start cap using a meter that reads only AC (not the DC omponent). It should go to 0 VAC once the motor is turning at normal speed. If not, you'll have to disassemble the motor and determine what's going on. And have your safety goggles on while doing it! That's a really good point, Sam. I have no idea if this motor has that type of switch or not. It's a Westinghouse 1/2 hp motor. Is the switch internal to the motor, or might it be external? If it's internal, then I really doubt I could have gotten any grease on it... but if external then I suppose there's a possibility. In any case I'll buy 2 new caps since they're only $8. Dan |
#16
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motor start capacitor
"Dan Lenski" writes:
Sam Goldwasser wrote: I'm not convinced that it's a coincidence. If you really sprayed grease inside the motor, you may have gotten it on the contacts of the centrifugal switch that is supposed to interrupt the circuit to the start cap once the motor gets up to speed. If the start cap remains energized for more than the time needed to start, it will do exactly what you describe quite quickly. So, at the very least, you should check the AC voltage on the start cap using a meter that reads only AC (not the DC omponent). It should go to 0 VAC once the motor is turning at normal speed. If not, you'll have to disassemble the motor and determine what's going on. And have your safety goggles on while doing it! That's a really good point, Sam. I have no idea if this motor has that type of switch or not. It's a Westinghouse 1/2 hp motor. Is the switch internal to the motor, or might it be external? If it's internal, then I really doubt I could have gotten any grease on it... but if external then I suppose there's a possibility. In any case I'll buy 2 new caps since they're only $8. It would be inside the motor, probably at the opposite end from the output shaft. Someone else pointed out that he didn't think this was likely in a motor used for this application but rather a PSC motor. However, then you would have a motor run cap, not a motor start cap. I don't recall what the specs were for your cap. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#17
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motor start capacitor
Dan Lenski wrote:
Sam Goldwasser wrote: I'm not convinced that it's a coincidence. If you really sprayed grease inside the motor, you may have gotten it on the contacts of the centrifugal switch that is supposed to interrupt the circuit to the start cap once the motor gets up to speed. If the start cap remains energized for more than the time needed to start, it will do exactly what you describe quite quickly. So, at the very least, you should check the AC voltage on the start cap using a meter that reads only AC (not the DC omponent). It should go to 0 VAC once the motor is turning at normal speed. If not, you'll have to disassemble the motor and determine what's going on. And have your safety goggles on while doing it! That's a really good point, Sam. I have no idea if this motor has that type of switch or not. It's a Westinghouse 1/2 hp motor. Is the switch internal to the motor, or might it be external? If it's internal, then I really doubt I could have gotten any grease on it... but if external then I suppose there's a possibility. In any case I'll buy 2 new caps since they're only $8. Dan I've seen a variety of those types of switches. Air pump driven, Magnetic Drag driven, bearing slip driven etc. all usually have a return spring or something to force the switch back into it's starting point again. Most common one's i've seen are magnetic and get pulled from the shaft when it's spinning. you might want to pull the back cover off the motor to make sure the mags still are there or have some life in them. Heat over time can kill them and thus not switch off the cap also, also a fused set of contacts don't help; -- "I'm never wrong, once i thought i was, but was mistaken" Real Programmers Do things like this. http://webpages.charter.net/jamie_5 |
#18
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motor start capacitor
Homer J Simpson wrote:
"Dan Lenski" wrote in message oups.com... Thanks for relieving my guilty conscience :-) I was beginning to suspect the same... though it's darned uncanny that it blew immediately after I greased the mechanical parts. Don't you hate when that happens? Yea ! Like when you do a clean re-install on a computer, set it up just right........... then the hard drive fails !*@$"£@ -- Best Regards: Baron. |
#19
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motor start capacitor
Jamie wrote:
Dan Lenski wrote: Sam Goldwasser wrote: I'm not convinced that it's a coincidence. If you really sprayed grease inside the motor, you may have gotten it on the contacts of the centrifugal switch that is supposed to interrupt the circuit to the start cap once the motor gets up to speed. If the start cap remains energized for more than the time needed to start, it will do exactly what you describe quite quickly. So, at the very least, you should check the AC voltage on the start cap using a meter that reads only AC (not the DC omponent). It should go to 0 VAC once the motor is turning at normal speed. If not, you'll have to disassemble the motor and determine what's going on. And have your safety goggles on while doing it! That's a really good point, Sam. I have no idea if this motor has that type of switch or not. It's a Westinghouse 1/2 hp motor. Is the switch internal to the motor, or might it be external? If it's internal, then I really doubt I could have gotten any grease on it... but if external then I suppose there's a possibility. In any case I'll buy 2 new caps since they're only $8. Dan I've seen a variety of those types of switches. Air pump driven, Magnetic Drag driven, bearing slip driven etc. all usually have a return spring or something to force the switch back into it's starting point again. Most common one's i've seen are magnetic and get pulled from the shaft when it's spinning. you might want to pull the back cover off the motor to make sure the mags still are there or have some life in them. Heat over time can kill them and thus not switch off the cap also, also a fused set of contacts don't help; Hi... Might even be a simple centrifugal switch, in which case grease might be enough to bind it up. Take care. Ken PS - REAL programmers use copy con. |
#20
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motor start capacitor
Ken Weitzel wrote:
Jamie wrote: Dan Lenski wrote: Sam Goldwasser wrote: I'm not convinced that it's a coincidence. If you really sprayed grease inside the motor, you may have gotten it on the contacts of the centrifugal switch that is supposed to interrupt the circuit to the start cap once the motor gets up to speed. If the start cap remains energized for more than the time needed to start, it will do exactly what you describe quite quickly. So, at the very least, you should check the AC voltage on the start cap using a meter that reads only AC (not the DC omponent). It should go to 0 VAC once the motor is turning at normal speed. If not, you'll have to disassemble the motor and determine what's going on. And have your safety goggles on while doing it! That's a really good point, Sam. I have no idea if this motor has that type of switch or not. It's a Westinghouse 1/2 hp motor. Is the switch internal to the motor, or might it be external? If it's internal, then I really doubt I could have gotten any grease on it... but if external then I suppose there's a possibility. In any case I'll buy 2 new caps since they're only $8. Dan I've seen a variety of those types of switches. Air pump driven, Magnetic Drag driven, bearing slip driven etc. all usually have a return spring or something to force the switch back into it's starting point again. Most common one's i've seen are magnetic and get pulled from the shaft when it's spinning. you might want to pull the back cover off the motor to make sure the mags still are there or have some life in them. Heat over time can kill them and thus not switch off the cap also, also a fused set of contacts don't help; Hi... Might even be a simple centrifugal switch, in which case grease might be enough to bind it up. Take care. Ken PS - REAL programmers use copy con. i thought they used a numerical HEX entry key board! -- "I'm never wrong, once i thought i was, but was mistaken" Real Programmers Do things like this. http://webpages.charter.net/jamie_5 |
#21
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motor start capacitor
"Jamie" t wrote in message ... PS - REAL programmers use copy con. i thought they used a numerical HEX entry key board! Front panel toggle switches. |
#22
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motor start capacitor
Jamie wrote:
Ken Weitzel wrote: Jamie wrote: Dan Lenski wrote: Sam Goldwasser wrote: I'm not convinced that it's a coincidence. If you really sprayed grease inside the motor, you may have gotten it on the contacts of the centrifugal switch that is supposed to interrupt the circuit to the start cap once the motor gets up to speed. If the start cap remains energized for more than the time needed to start, it will do exactly what you describe quite quickly. So, at the very least, you should check the AC voltage on the start cap using a meter that reads only AC (not the DC omponent). It should go to 0 VAC once the motor is turning at normal speed. If not, you'll have to disassemble the motor and determine what's going on. And have your safety goggles on while doing it! That's a really good point, Sam. I have no idea if this motor has that type of switch or not. It's a Westinghouse 1/2 hp motor. Is the switch internal to the motor, or might it be external? If it's internal, then I really doubt I could have gotten any grease on it... but if external then I suppose there's a possibility. In any case I'll buy 2 new caps since they're only $8. Dan I've seen a variety of those types of switches. Air pump driven, Magnetic Drag driven, bearing slip driven etc. all usually have a return spring or something to force the switch back into it's starting point again. Most common one's i've seen are magnetic and get pulled from the shaft when it's spinning. you might want to pull the back cover off the motor to make sure the mags still are there or have some life in them. Heat over time can kill them and thus not switch off the cap also, also a fused set of contacts don't help; Hi... Might even be a simple centrifugal switch, in which case grease might be enough to bind it up. Take care. Ken PS - REAL programmers use copy con. i thought they used a numerical HEX entry key board! When I started out we used switches, one per bit. -- The e-mail address in our reply-to line is reversed in an attempt to minimize spam. Our true address is of the form . |
#23
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motor start capacitor
"Homer J Simpson" writes:
"Jamie" t wrote in message ... PS - REAL programmers use copy con. i thought they used a numerical HEX entry key board! Front panel toggle switches. How fast could you re-enter the boot code into a PDP-11? --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#24
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motor start capacitor
Sam Goldwasser wrote:
"Homer J Simpson" writes: "Jamie" t wrote in message ... PS - REAL programmers use copy con. i thought they used a numerical HEX entry key board! Front panel toggle switches. How fast could you re-enter the boot code into a PDP-11? That depends on how big your boots were. I made sure a lot of them would never boot again, and sold the leftovers. They were from leased CAD systems that were being retired, and had to go through certified destruction, but were were allowed to sell lots of the parts. I still have a pair of aluminum racks from the LSI versions that were used to process CATV bills. -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida |
#25
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motor start capacitor
CJT wrote:
Jamie wrote: Ken Weitzel wrote: Jamie wrote: Dan Lenski wrote: Sam Goldwasser wrote: I'm not convinced that it's a coincidence. If you really sprayed grease inside the motor, you may have gotten it on the contacts of the centrifugal switch that is supposed to interrupt the circuit to the start cap once the motor gets up to speed. If the start cap remains energized for more than the time needed to start, it will do exactly what you describe quite quickly. So, at the very least, you should check the AC voltage on the start cap using a meter that reads only AC (not the DC omponent). It should go to 0 VAC once the motor is turning at normal speed. If not, you'll have to disassemble the motor and determine what's going on. And have your safety goggles on while doing it! That's a really good point, Sam. I have no idea if this motor has that type of switch or not. It's a Westinghouse 1/2 hp motor. Is the switch internal to the motor, or might it be external? If it's internal, then I really doubt I could have gotten any grease on it... but if external then I suppose there's a possibility. In any case I'll buy 2 new caps since they're only $8. Dan I've seen a variety of those types of switches. Air pump driven, Magnetic Drag driven, bearing slip driven etc. all usually have a return spring or something to force the switch back into it's starting point again. Most common one's i've seen are magnetic and get pulled from the shaft when it's spinning. you might want to pull the back cover off the motor to make sure the mags still are there or have some life in them. Heat over time can kill them and thus not switch off the cap also, also a fused set of contacts don't help; Hi... Might even be a simple centrifugal switch, in which case grease might be enough to bind it up. Take care. Ken PS - REAL programmers use copy con. i thought they used a numerical HEX entry key board! When I started out we used switches, one per bit. Yeah, but you had 0's and 1's to work with. When I started out we only had the 0's. AND - we had to whittle our own chips. Take care. Ken |
#26
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motor start capacitor
On Tue, 26 Dec 2006 00:07:48 GMT, Ken Weitzel wrote:
CJT wrote: Jamie wrote: Ken Weitzel wrote: Jamie wrote: Dan Lenski wrote: Sam Goldwasser wrote: I'm not convinced that it's a coincidence. If you really sprayed grease inside the motor, you may have gotten it on the contacts of the centrifugal switch that is supposed to interrupt the circuit to the start cap once the motor gets up to speed. If the start cap remains energized for more than the time needed to start, it will do exactly what you describe quite quickly. So, at the very least, you should check the AC voltage on the start cap using a meter that reads only AC (not the DC omponent). It should go to 0 VAC once the motor is turning at normal speed. If not, you'll have to disassemble the motor and determine what's going on. And have your safety goggles on while doing it! That's a really good point, Sam. I have no idea if this motor has that type of switch or not. It's a Westinghouse 1/2 hp motor. Is the switch internal to the motor, or might it be external? If it's internal, then I really doubt I could have gotten any grease on it... but if external then I suppose there's a possibility. In any case I'll buy 2 new caps since they're only $8. Dan I've seen a variety of those types of switches. Air pump driven, Magnetic Drag driven, bearing slip driven etc. all usually have a return spring or something to force the switch back into it's starting point again. Most common one's i've seen are magnetic and get pulled from the shaft when it's spinning. you might want to pull the back cover off the motor to make sure the mags still are there or have some life in them. Heat over time can kill them and thus not switch off the cap also, also a fused set of contacts don't help; Hi... Might even be a simple centrifugal switch, in which case grease might be enough to bind it up. Take care. Ken PS - REAL programmers use copy con. i thought they used a numerical HEX entry key board! When I started out we used switches, one per bit. Yeah, but you had 0's and 1's to work with. When I started out we only had the 0's. AND - we had to whittle our own chips. Take care. Ken REAL programmers keep getting confused between Halloween & Christmas (Oct 31 = Dec 25). -- Australia isn't "down under", it's "off to one side"! www.cobracat.com (home of the Australian Cobra Catamaran) www.parkdaleyc.com (where most of them sail) http://groups.yahoo.com/group/cobra-cat/ |
#27
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motor start capacitor
Well, I got the capacitor from Grainger and the door opener works
flawlessly now. So I've no idea whether the original failure was a freak coincidence or not :-) I hadn't realized that Grainger only sells to businesses/institutions, but the guy there helped me out by pointing out that my employer (U of Maryland) has an account, so I was able to buy it. Woohoo. Dan |
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