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Tool Talk Discussion Forum

Honda EX1000

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jimlll

09-24-2005 19:15:07




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In servicing my Honda EX1000 generator, I over reved the engine, now it will not produce any power. I have tried resetting the circuit breakers, with no luck.

Does anyone know if it has an electronic voltage protective device? Does anyone know of a website that shows a circuit diagram?

Thanks for any assistance




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Harvey1

09-25-2005 04:30:57




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 Re: Honda EX1000 in reply to jimlll, 09-24-2005 19:15:07  
Jim I'm probably not going to be much of assistance but your generator may need 'flashing' or to be 'flashed'. I don't remember the proper term. If I remember correctly, you start the generator, plug in an electric drill, then manually term the chuck of the drill in reverse, do this for a few seconds. I'm not sure what this does, but I have read threads on this on this board for similar problems. Hope this helps.

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David Benyon

05-18-2006 17:38:56




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 Re: Honda EX1000 in reply to Harvey1, 09-25-2005 04:30:57  
Hi! Firstly may I wish you the best of luck in fixing your generator. The first problem that you have is the model number. Often with Honda the number (like EX1500) stays the same over several years but the machines can be completely different! Some small Hondas use inverter technology and thankfully I've not come across one of these so far. Most Honda gensets have alternators made by Sawafuji and the wiring on the later models is complex with compensating windings etc.
Often the part that fails is the rectifier, but sometimes the windings fail. This is especially the case with the very old shunt-wound E1500. On these machines the final magnetic field strength is determined by magnetic saturation of the narrow parts of the pole pieces. Voltage is then proportional to engine speed (the rate at which lines of force are being cut). Unfortunately if the engine is over revved the field coils burn out or develop shorted turns because of excess voltage. New field coils are not an economic proposition. As to renewing the residual magnetism, the drill idea is not so good. What you need to do is "flash" the field windings briefly with a 12 volt battery (car battery). Half a second is plenty long enough. If the first attempt does not make the generator work try reversing the battery connections. If you still have no luck you will have to test or replace the rectifiers (these often fail because of surges). NEVER EVER use a vari-speed drill on a portable generator unless there is a light bulb connected as well. Without the bulb, damaging high voltages will be produced as the chopper in the speed controller abrubtly switches the current on and off. (Some British made building site generators seem to be immune from this problem as there is a 16 microfarad capacitor built in as part of the "direct compound excitation system" - really neat!) On these Haverhill machines, failure is caused by vibration. Note that this type of electrical repair work should only be attempted by skilled persons and I take no responsibility for accidents or damage caused etc.
Best regards from Dave.

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