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Messages - sbkenn

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Lister Based Generators / Re: LR1 - Generator head scratching
« on: August 27, 2020, 06:37:56 PM »
Ran up with the AVR.
80 odd vdc into the stator to get 220 VAC.
Rotor 100 meg+

Insulation tester is a MeggER  ;-)
80VDC seems a lot.
Are you sure the polarity of the stator is correct, you could fighting the permanent part of the field. 
Alternatively, could the windings be for a 120V output ?

Lister Based Generators / Re: LR1 - Generator head scratching
« on: August 27, 2020, 06:30:32 PM »
I have a similar one, but 3-phase.  It is inside-out, that is, the field is fixed, the 3-phase rotates.  It has severeal inductors for the exciter and regulation.  As mentioned in another thread, the mains comes through an inductor which saturates.  The exciter reference voltage is produced by a secondary winding on that inductor.  Sense inductor then (effectively) compares the reference voltage to the sensed voltage, rectifies it, and energises the field.
I am actively looking for a solid-state replacement as one of the sense windings is damages and I have to use phase-phase in order to get 230V out of the machine (one of the 3 sense inductors dead, means that ot is only supplying 2/3 of the normal current to the field.

Is it possible to spin the genny with 24 v. battery?  will it turn with 12v.? I want to start it again with the genny
A motor will be quite happy with more voltage, for short periods.  The solenoid, less so.  Heaters (OK, not on a Lister anyway) will cook in an instant.

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