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[hammond_zone] Help!!!
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Chris Clifton
Hi Johan,
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I'm guessing that you start the organ up as usual, but when you switch to run the generator stops? Looking at the diagrams there appears to be two windings on the run motor, one is brought out to a pair of red wires, the other to a pair of black (or blue, the diagram shows blue in brackets as an alternative). It would be interesting to disconnect the wires at one end and measure the resistance of each winding, I would expect them to be about the same. If the converter damaged one winding when it died you may find a very different resistance on the two windings. It is possible, depending on the design of the converter that when it died it fed DC voltage to the motor, which may have damaged the motor. The only other thing I can think of is that if during installation of the new converter you removed all the wires to the motor from the terminal strip, (I can't see that you would need to do this, just considering possibilities). If one pair of wires e.g. the reds were reversed when reconnecting this would reverse the direction of rotation of the motor, which would be quite interesting to say the least when the starter spins it in the original direction. I don't think this is likely however, I'm just mentioning it as a possibility. When acting on technical advice given in the Hammond zone, by me or anyone else, please remember that there is high voltage electricity inside Hammond organs and Leslie speakers. It is not just the AC line voltage, valve (tube) equipment uses high DC voltages which may remain for sometime after switching off. Take care and enjoy your Hammond for many years. Chris Clifton ----- Original Message -----
From: "johanedin" <johanedin@...> To: <hammond_zone@...> Sent: Sunday, April 14, 2002 2:13 PM Subject: [hammond_zone] Help!!! Hi! --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (). Version: 6.0.345 / Virus Database: 193 - Release Date: 09/04/02 |
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Peter D Abrams
Chris Clifton wrote:
The only other thing I can think of is that if during installation ofCliff - The polarity of the wires doesn't matter, only that both red wires go to one side of the AC and the 2 blacks to the other side. These non self-starting motors don't have a clue as to rotational direction, in fact if you can get it up to speed going in the reverse direction, it'll lock right in! All of the synchro hammond clocks will do this too, and I've tried it, it works. I didn't feel any younger though. Time marches on... pda Jax Fl. |
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Chris Clifton
Hi Peter,
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It was just a guess on my part, I stand corrected. The wiring diagram in my A-100 service manual does show one red and one black to each side of the AC power supply, presumably the reds are one winding and the blacks the other. If only one winding was operative, I think that this may give the symptoms that Johan describes. The big question is why? Is the motor faulty or the organ wiring? From the Weyr and from the Bowl, Bronze and brown and blue and green, Rise the dragonmen of Pern, Aloft on wing, seen, then unseen. Chris 50 & Laura 18, Sam(uel)15 and Emily 11 in Llanelli ----- Original Message -----
From: "Peter D Abrams" <pabrams@...> To: <hammond_zone@...> Sent: Sunday, April 14, 2002 6:36 PM Subject: Re: [hammond_zone] Help!!!
--- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (). Version: 6.0.345 / Virus Database: 193 - Release Date: 09/04/02 |
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Drew
Question:
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Chris (or anyone who knows) What type of AC motor is the "synchronous"? ( I'm gonna guess that the start motor is a AC series type, where the field coils are in series with the armature windings.) Thanks - Drew Chris Clifton wrote: Hi Peter, |
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