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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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generator problem(s)
Just started-up a 2.2kW dual-voltage genny after a few years of sitting
in the garage and there's no output. It's marked "Allam Generators" and has had very little use, it was perfect when last used. The c/b hasn't tripped and trying the switch in all 3 positions makes no difference. It doesn't seem to have any electronics in it. Any suggestions? Also, it started/ran with clouds of smoke so I guess it's possible that the rings were rusted and broke when it started. The engine is marked Honda GX160 5.5HP. Where's a good place for Honda spares? Hugh |
#2
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generator problem(s)
"NoSpam" wrote in message ... Just started-up a 2.2kW dual-voltage genny after a few years of sitting in the garage and there's no output. It's marked "Allam Generators" and has had very little use, it was perfect when last used. The c/b hasn't tripped and trying the switch in all 3 positions makes no difference. It doesn't seem to have any electronics in it. Any suggestions? Also, it started/ran with clouds of smoke so I guess it's possible that the rings were rusted and broke when it started. The engine is marked Honda GX160 5.5HP. Where's a good place for Honda spares? Hugh You can get Honda spares easily enough on ebay, or I have a good GX160 sitting here if you're interested, located in Luton, Beds. Make me an offer! As for no output, if it was working OK last time there is not much that is likely to have failed in the alternator. Maybe corroded contacts in the switch(s)? I have several generators and try and make sure they all get run every few months between "work". I suggest you do the same once yours is in better health. Alan. |
#3
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generator problem(s)
Alan wrote:
"NoSpam" wrote in message ... Just started-up a 2.2kW dual-voltage genny after a few years of sitting in the garage and there's no output. It's marked "Allam Generators" and has had very little use, it was perfect when last used. The c/b hasn't tripped and trying the switch in all 3 positions makes no difference. It doesn't seem to have any electronics in it. Any suggestions? Also, it started/ran with clouds of smoke so I guess it's possible that the rings were rusted and broke when it started. The engine is marked Honda GX160 5.5HP. Where's a good place for Honda spares? Hugh You can get Honda spares easily enough on ebay, or I have a good GX160 sitting here if you're interested, located in Luton, Beds. Make me an offer! As for no output, if it was working OK last time there is not much that is likely to have failed in the alternator. Maybe corroded contacts in the switch(s)? I have several generators and try and make sure they all get run every few months between "work". I suggest you do the same once yours is in better health. Alan. The wonderful eBay, I ought to have guessed. Thanks. (Luton is a bit too far and doing the rings should be easy enough - assuming the bore isn't damaged) H |
#4
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generator problem(s)
On 25 Jan, 21:14, NoSpam wrote:
Just started-up a 2.2kW dual-voltage genny after a few years of sitting in the garage and there's no output. it was perfect when last used. doesn't seem to have any electronics in it. Any suggestions? get yourself a multimeter and do some fault finding. Theres no way we can know which part of the electrical circuit is at fault. NT |
#5
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generator problem(s)
NoSpam wrote in message ... Just started-up a 2.2kW dual-voltage genny after a few years of sitting in the garage and there's no output. It's marked "Allam Generators" and has had very little use, it was perfect when last used. What could have happened are the connections between the exciter wiring and the main field coils have corroded so its not self-energising, they are not usually the most user friendly things to dismantle though. ;( - |
#6
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generator problem(s)
Mark wrote:
NoSpam wrote in message ... Just started-up a 2.2kW dual-voltage genny after a few years of sitting in the garage and there's no output. It's marked "Allam Generators" and has had very little use, it was perfect when last used. What could have happened are the connections between the exciter wiring and the main field coils have corroded so its not self-energising, they are not usually the most user friendly things to dismantle though. ;( Thanks. Presumably it just relies on residual magnetism to get started(?). If there aren't any "well known" failure modes I just need to work through methodically. H |
#7
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generator problem(s)
"NoSpam" wrote in message ... Mark wrote: NoSpam wrote in message ... Just started-up a 2.2kW dual-voltage genny after a few years of sitting in the garage and there's no output. It's marked "Allam Generators" and has had very little use, it was perfect when last used. What could have happened are the connections between the exciter wiring and the main field coils have corroded so its not self-energising, they are not usually the most user friendly things to dismantle though. ;( Thanks. Presumably it just relies on residual magnetism to get started(?). No it's a bit more complicated then that, Do a search on Google or Wikipedia for Brushless Alternators to get a better description of how they work. If there aren't any "well known" failure modes I just need to work through methodically. Without the wiring diagram fault finding can be very difficult unless you fully understand how they work. - |
#8
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generator problem(s)
Mark wrote:
"NoSpam" wrote in message ... Mark wrote: NoSpam wrote in message ... Just started-up a 2.2kW dual-voltage genny after a few years of sitting in the garage and there's no output. It's marked "Allam Generators" and has had very little use, it was perfect when last used. What could have happened are the connections between the exciter wiring and the main field coils have corroded so its not self-energising, they are not usually the most user friendly things to dismantle though. ;( Thanks. Presumably it just relies on residual magnetism to get started(?). No it's a bit more complicated then that, Do a search on Google or Wikipedia for Brushless Alternators to get a better description of how they work. If there aren't any "well known" failure modes I just need to work through methodically. Without the wiring diagram fault finding can be very difficult unless you fully understand how they work. Aha, that's cunning. So a small integral alternator uses residual magnetism to "start-up" and then generate a current that's rectified and fed to the main alternator armature. Load current is taken from the stator and regulation is achieved by varying the current in the stator of the small alternator. I wish I'd thought of that, it's very elegant. I wonder why car alternators don;t work like this. How does the regulation work, is it just that a proportion of the output voltage is applied across the stator of the small alternator? With this injection of knowledge it looks like it'll be a connector problem. There's continuity from L-N at the output so presumably the problem is in the control mechanism. Hugh |
#9
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generator problem(s)
On Fri, 26 Jan 2007 09:47:44 +0000, NoSpam wrote:
Thanks. Presumably it just relies on residual magnetism to get started(?). If there aren't any "well known" failure modes I just need to work through methodically. Some generators may fail with a "no residual magnetism left" mode -- mine has something like that in the manual. The curse, ISTR, is to attach a 12 volt DC source to the output and then start up the generator again. I've googled a bit and found this: http://www.engineersedge.com/motors/...d_flashing.htm (wot basically says "read the applicable manual...) and this bit of magic: http://www.perr.com/tip16.html Thomas Prufer |
#10
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generator problem(s)
Thomas Prufer wrote:
On Fri, 26 Jan 2007 09:47:44 +0000, NoSpam wrote: Thanks. Presumably it just relies on residual magnetism to get started(?). If there aren't any "well known" failure modes I just need to work through methodically. Some generators may fail with a "no residual magnetism left" mode -- mine has something like that in the manual. The curse, ISTR, is to attach a 12 volt DC source to the output and then start up the generator again. I've googled a bit and found this: http://www.engineersedge.com/motors/...d_flashing.htm (wot basically says "read the applicable manual...) and this bit of magic: http://www.perr.com/tip16.html Thomas Prufer Fantastic! I'll give it a go over the weekend. The thing is producing so much smoke at the moment that I can't run it in the garage. Hugh |
#11
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generator problem(s)
Thomas Prufer wrote:
On Fri, 26 Jan 2007 09:47:44 +0000, NoSpam wrote: Thanks. Presumably it just relies on residual magnetism to get started(?). If there aren't any "well known" failure modes I just need to work through methodically. Some generators may fail with a "no residual magnetism left" mode -- mine has something like that in the manual. The curse, ISTR, is to attach a 12 volt DC source to the output and then start up the generator again. I've googled a bit and found this: http://www.engineersedge.com/motors/...d_flashing.htm (wot basically says "read the applicable manual...) and this bit of magic: http://www.perr.com/tip16.html Thomas Prufer Fixed the smoke problem and just tried the drill idea, I was right to be sceptical :-( Also tried flashing with a 30V/2A power supply but it didn't do any good - probably not enough current. In the old days of car dynamos I remember having to flash them to get the correct polarity - ISTR that all we did was briefly connect the car battery directly across the field windings. Please could you summarise what your manual says? Hugh |
#12
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generator problem(s)
On Sun, 28 Jan 2007 15:46:45 +0000, NoSpam wrote:
Please could you summarise what your manual says? I can't get to it now, and it isn't online... I'll watch the thread, and post if it isn't sorted by the time I can get to the manual again. ISTR just this -- "connect a 12 V DC battery across the output". It's a cheap-and-cheerful asynchronous generator, briggs & Stratton lawnmower engine, rated at 2000 W (by optimists!). Thomas Prufer |
#13
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generator problem(s)
NoSpam wrote in message ... Fixed the smoke problem and just tried the drill idea, I was right to be sceptical :-( Also tried flashing with a 30V/2A power supply but it didn't do any good - probably not enough current. Whoops ! Flashing is normally only necessary on brush type alternators and even then only a 9v-pp3 battery is enough on small domestic types. Self energising brushless alternators have varied methods of energising the exciter field windings, a supply is sometimes taken from the driving motors flywheel gen, or a capacitor is used with a separate pickup coil. As I said fault-finding without the wiring diagram or understanding how that particular generator works is not easy. Of all the DOA small generators I have bought with Zero output, the problem has been corroded connections causing high resistance in the exciter circuit. - |
#14
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generator problem(s)
On Thu, 25 Jan 2007 21:14:25 +0000, NoSpam wrote:
Where's a good place for Honda spares? Honda have a very good spares/dealer network in the UK wander off the the Honda website http://www.honda.co.uk/energy/ and click the "dealer search". The one I called, in Dumfries IIRC, about parts for an ancient (and I mean 20+ years old) Honda engine was very helpful and knowledgeable. What colour is the smoke? Have turned off the choke? These small engines only need choke for about 30s and then only from stone cold. -- Cheers Dave. pam is missing e-mail |
#15
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generator problem(s) - sump was too full!
Dave Liquorice wrote:
On Thu, 25 Jan 2007 21:14:25 +0000, NoSpam wrote: Where's a good place for Honda spares? Honda have a very good spares/dealer network in the UK wander off the the Honda website http://www.honda.co.uk/energy/ and click the "dealer search". The one I called, in Dumfries IIRC, about parts for an ancient (and I mean 20+ years old) Honda engine was very helpful and knowledgeable. What colour is the smoke? Have turned off the choke? These small engines only need choke for about 30s and then only from stone cold. Thanks Dave (and everyone else). It turned-out that the sump was absolutely full (and I mean FULL) of very dilute oil; presumably the fuel tap was left switched on and fuel had found its way into the sump. Once the sump was drained and refilled it ran sweetly again with no smoke and the speed correctly regulated - BUT there's still no output. Hugh |
#16
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generator problem(s)
We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember NoSpam saying something like: Just started-up a 2.2kW dual-voltage genny after a few years of sitting in the garage and there's no output. It's marked "Allam Generators" and has had very little use, it was perfect when last used. The c/b hasn't tripped and trying the switch in all 3 positions makes no difference. It doesn't seem to have any electronics in it. Any suggestions? The most common cause of this on a genset that's been lying unused for ages is damp in the windings. Take off the end cover and direct a 1kW fan heater into the end of the alternator for a few hours then try it. Not too close with the heater, mind. -- Dave |
#17
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generator problem(s)
"Grimly Curmudgeon" wrote in message ... We were somewhere around Barstow, on the edge of the desert, when the drugs began to take hold. I remember NoSpam saying something like: Just started-up a 2.2kW dual-voltage genny after a few years of sitting in the garage and there's no output. It's marked "Allam Generators" and has had very little use, it was perfect when last used. The c/b hasn't tripped and trying the switch in all 3 positions makes no difference. It doesn't seem to have any electronics in it. Any suggestions? The most common cause of this on a genset that's been lying unused for ages is damp in the windings. How can damp affect _insulated_ windings? Sylvain. Take off the end cover and direct a 1kW fan heater into the end of the alternator for a few hours then try it. Not too close with the heater, mind. -- Dave |
#18
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generator problem(s)
On Mon, 29 Jan 2007 21:07:42 +0000, Sylvain VAN DER WALDE wrote:
"Grimly Curmudgeon" wrote in message ... We were somewhere around Barstow, on the edge of the desert, when the drugs began to take hold. I remember NoSpam saying something like: Just started-up a 2.2kW dual-voltage genny after a few years of sitting in the garage and there's no output. It's marked "Allam Generators" and has had very little use, it was perfect when last used. The c/b hasn't tripped and trying the switch in all 3 positions makes no difference. It doesn't seem to have any electronics in it. Any suggestions? The most common cause of this on a genset that's been lying unused for ages is damp in the windings. How can damp affect _insulated_ windings? It most certainly can. Presumably the insulation is not very thick and can contain microscopic fracture which allow the ingress of moisture and/or dirt so great increasing leakage current and lowering breakdown voltage. Armature winders would not otherwise go to great lengths to bake winding dry before and after dipping in the varnish vat. -- Ed Sirett - Property maintainer and registered gas fitter. The FAQ for uk.diy is at http://www.diyfaq.org.uk Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html Gas Fitting Standards Docs he http://www.makewrite.demon.co.uk/GasFittingStandards |
#19
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generator problem(s)
"Ed Sirett" wrote in message ... On Mon, 29 Jan 2007 21:07:42 +0000, Sylvain VAN DER WALDE wrote: "Grimly Curmudgeon" wrote in message ... We were somewhere around Barstow, on the edge of the desert, when the drugs began to take hold. I remember NoSpam saying something like: Just started-up a 2.2kW dual-voltage genny after a few years of sitting in the garage and there's no output. It's marked "Allam Generators" and has had very little use, it was perfect when last used. The c/b hasn't tripped and trying the switch in all 3 positions makes no difference. It doesn't seem to have any electronics in it. Any suggestions? The most common cause of this on a genset that's been lying unused for ages is damp in the windings. How can damp affect _insulated_ windings? It most certainly can. Presumably the insulation is not very thick and can contain microscopic fracture which allow the ingress of moisture and/or dirt so great increasing leakage current and lowering breakdown voltage. Armature winders would not otherwise go to great lengths to bake winding dry before and after dipping in the varnish vat. Thanks for that info. Sylvain. -- Ed Sirett - Property maintainer and registered gas fitter. The FAQ for uk.diy is at http://www.diyfaq.org.uk Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html Gas Fitting Standards Docs he http://www.makewrite.demon.co.uk/GasFittingStandards |
#20
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generator problem(s)
We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember "Sylvain VAN DER WALDE" saying something like: The most common cause of this on a genset that's been lying unused for ages is damp in the windings. How can damp affect _insulated_ windings? They're only insulated with pixie snot. -- Dave |
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