These needed the 12 volt battery to get everything started. This caused an AC voltage in one half of the rotor which was rectified by rotating diodes and fed to other half of rotor which in turn caused an output from the output stator. These used an AVR to supply current to a static field. However the larger sets used a completely different method. The output coils rotated with static field and four slip rings. Then the parallel winding resistor was set to give 240 volt then we put on a load quite high often full load and the series resistor was set to 240 volt.Īs load increased the voltage would vary but would be some where between the 220 and 240 range it was a little hit and miss. The generator was first set to 1500 RPM I used a frequency meter and set to 50 Hz but rev counter would do the same. One set in series the other in parallel the series set had a huge rectifier and parallel a small one and both also had resistors to set the output. Seem to remember out lighting towers used a Conveyors generator which had two sets of field windings. My method of repair back in 1980 was to swap parts good one to one which was not running until fault swapped then order up that part.
Some used a large capacitor but I never worked out exactly how. Often disabled by farm managers as there was a tendency not to check oil before starting. There was one used a lot on the Falklands where the generator was also a started motor and switching on the lights auto started the generator. Options include weatherproof outlets & earth leakage circuit breaker, wheel & fold down handles, centre lift bar (removable), earth stake kit, battery (electric start models) and extended operation fuel tank (18 or 50 litres).The Lister engine was used to drive many generators with many methods used to control them.
Naturally aspirated with 100 hour service intervals these engine offer low cost and renowned Lister reliability covered by a limited 24 month warranty. Lister Petter, with over one hundred years of diesel generator experience, manufacture the single cylinder air cooled engines off the same robust design that has consistently set the standard in quality and reliability.
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