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FORWARDED FOR ARCHIVES AT WILLIAM BAYNES' REQUEST don bowen [EMAIL PROTECTED] > [Original Message] > From: William R. Bayne <[EMAIL PROTECTED]> > To: Donald Bowen <[EMAIL PROTECTED]> > Date: 2/7/2005 5:12:38 PM > Subject: Re: [COUPERS-TECH] GENERATORS/VOLTAGE REGULATORS > > > Hi Don, > > I tried to post the following without success. Would you please > forward this email to [TECH] so it will go into the archive there? > > Thanks, > > WRB > > -- > > Begin forwarded message: > > > From: William R. Bayne <[EMAIL PROTECTED]> > > Date: February 6, 2005 10:18:47 PM CST > > To: COUPERS-TECH <[email protected]> > > Cc: Harry Francis <[EMAIL PROTECTED]> > > Subject: Re: [COUPERS-TECH] GENERATORS/VOLTAGE REGULATORS > > > > > > Hi Don, > > > > You are observing high voltage in flight. That is not, of itself, > > indicative of a voltage regulator problem. > > > > First make sure your battery is good (not sulfated or permanently > > damaged due to having been overheated). Perhaps the easiest way to do > > this is to borrow another battery of recent purchase that is properly > > charged and see if you still have the same symptoms aloft with it. > > > > Be aware that voltage regulators are compensated for temperature by > > means of a bimetal thermostat hinge on the armature. This causes the > > regulator to regulate at a higher voltage when cold which partly > > compensates for the fact that a higher voltage is required to charge a > > cold battery. In the summer, high temperature can reduce the > > resistance of the battery to charge so that it will accept a high > > charging rate even with a normal voltage regulator setting. > > > > If your battery seldom needs additional water to maintain correct > > electrolyte level your regulator may be OK as is. > > > > You did not mention if the excess voltage continues after your batter > > is fully charged. If it does, you could have a grounded generator > > field circuit. Grounding can occur in the generator and the wiring as > > well as in the regulator. > > With the cover off of the voltage regulator and looking at it with the > > three terminals facing you, the left mechanism is the cutout relay. > > The center one is the current regulator and the one on the right is > > the voltage regulator. > > > > I leave it to you to determine how to accomplish the following in a > > safe manner. Presuming high temperature not to be the present case, > > Delco-Remy recommends disconnecting the lead from the "F" terminal > > with the generator operating at medium speed. If the output remains > > high, the generator field is grounded, either in the generator or in > > the wiring harness. If the output drops off, check the regulator for > > grounds or improper high voltage setting. > > > > The regulator must be mounted in the operating position when > > electrical settings are checked and adjusted, and it must be at > > operating temperature. Operating temperature is reached after 15 > > minutes of continuous operation with the regulator cover in place, the > > "Batt." terminal wire removed from the regulator and fed into a 1/4 > > ohm fixed resistance with the output lead connected to the regulator > > "Batt." terminal. A voltmeter is also connected to the "Batt." > > terminal and grounded to the nearest (grounded) regulator mounting > > bolt. If a variable resistor is used, set to 1-10 amperes for the > > warm-up period. It is important that no other load other than > > ignition be turned on during the test. > > > > The ideal setting is one that keeps a GOOD battery at or near full > > charge with the minimum use of (distilled) water. If the battery uses > > too much water, reduce voltage setting 0.2 or 0.3 of a volt and check > > for improved condition over a reasonable service period. Repeat until > > satisfactory results are achieved. > > > > The voltage regulator setting screw is on the back side opposite the > > "F" terminal. Clockwise increases voltage setting. When reducing > > voltage, spring support may not return as screw is backed off. If you > > cannot adjust the unit with a screwdriver below the desired value and > > then slowly increase spring tension until the desired value is > > achieved, another step is required. > > > > Turn screw counterclockwise until there is ample clearance between > > screw head and spring support. Then bend spring support carefully > > until it touches the screw head. Final setting should always be made > > by increasing spring tension, never by reducing it. > > > > Understand that the above, as methodical as it may seem, is really the > > "quick and dirty" final adjustment of only the voltage regulation part > > of a regulator unit in reasonable condition we presume was set up > > correctly in the first place. There are quite lengthy specifications > > for initial set-up in Delco-Remy service bulletins. Since the voltage > > setting varies with the regulator ambient temperature, those bulletins > > also contain temperature-voltage charts. > > > > Delco-Remy also states that a great majority of all regulator trouble > > can be eliminated by a simple cleaning of the the current and > > regulator contact points, plus some possible readjustment. That's a > > further detailed procedure in itself involving a spoon or riffer file > > and subsequent cleaning with trichlorethylene or some "other" nontoxic > > (?) solution. > > CAUTION NEVER USE EMERY CLOTH OR SANDPAPER (Delco's emphasis). > > > > Regards, > > > > William R. Bayne > > <____|-(o)-|____> > > (Copyright 2004) > > -- > > On Feb 6, 2005, at 7:27 PM, Donald Bowen wrote: > > > > > ----[Please read http://ercoupers.com/disclaimer.htm before following > > any advice in this forum.]---- > > > > > > > > > > My new LOWRANCE GPS accepts 6 v dc to 30 v dc. When not operating > > on internal 6v batteries, the GPS shows incoming voltage from aircraft > > 12 v system. My voltage has been indicating 15 to 16 v dc , in > > flight, when the generator is replacing charge lost during starting. > > I have verified this with a multi-meter in flight ( don't ask me > > how). Question: How do I adjust the generator output/ voltage > > regulation down to 14.1v or so ? > > > > Don Bowen > > 65 ALON A-2 > > N6360V > > FT PIERCE, FL ========================================================================== ==== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers-tech/
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