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Re: 9N voltage regulator...
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Posted by Dell (WA) on October 07, 2005 at 10:06:19 from (172.193.195.77):
In Reply to: Re: 9N voltage regulator... posted by John T on October 06, 2005 at 06:32:07:
John.........yes to yer question #1. BOTH the 1939 N9 and the 1942 2N use the same 3rd brush genny and 2-terminal roundcan cutt-outt relay scheme. The 1948 8N uses a 3-terminal shunt-wound genny with a 4-wire (BATT, ARM, FLD, GND) "viberating field relay" squarecan voltage regulator in a "class A" genny charge configuration. While one of the genny to VR wires is a "ground" wire, it is NOT a control wire but provides low resistance ground between the genny barrel and the VR frame for voltage reference. The speed of the vibrating field relay is dependent upon the battery volts and controls the current thru the genny field and consequently the magnetic field strengh which controls the genny AMPS output. It also has a polarity sensitive cutt-outt relay and 2-relay cores. The 1953 NAA Jubilee and onward was changed to the "class B" genny charge configuration.........Hope this helps..........Dell, 40yrs Electronics Engr, ret Boeing Flt Test Engr
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