Foxtrott363 Posted January 8, 2019 Share Posted January 8, 2019 I'm searching for information about the Hopkins Engine Driven Battery Charger 12v/24v. I have two of these generator sets and both with the same fault. The excitor stator produces 10-16v, but has to produce 24-30v AC. I have all handbooks (Illustrated Part Catalogue, fault table, etc...). The stator has the part number RM21KX1 from Lucas. I bought a new RM21, but it didn't produce 24-30v ac, it produced 45-60v ac but with exactly the same part number. Does anyone here, have some experiences with these generator sets, or this exact fault? I've been searching for information since a year but with no results. Best regards from Germany Quote Link to comment Share on other sites More sharing options...
mogmaner Posted January 9, 2019 Share Posted January 9, 2019 Are you checking the voltage with a battery connected ? With no load the regulator has no reference voltage .40 to 50 volts is not uncommon in a open circuit situation . Quote Link to comment Share on other sites More sharing options...
ruxy Posted January 9, 2019 Share Posted January 9, 2019 Have you had a tacho on the Kubota ? Is it according to governor ? There must be a stated rpm for these tests , probably a large difference in generated voltage for small increase in speed + as stated it needs a load. Quote Link to comment Share on other sites More sharing options...
Foxtrott363 Posted January 9, 2019 Author Share Posted January 9, 2019 7 hours ago, mogmaner said: Are you checking the voltage with a battery connected ? With no load the regulator has no reference voltage .40 to 50 volts is not uncommon in a open circuit situation . I checked it with and without a battery connected. Same results. The manual says that the load can be connected before starting or while running, with the main switch off, so I tried both, but the resistors and capacitors in the control box started to melt and had to be exchanged. 7 hours ago, ruxy said: Have you had a tacho on the Kubota ? Is it according to governor ? There must be a stated rpm for these tests , probably a large difference in generated voltage for small increase in speed + as stated it needs a load. No i don't have a tacho on it. I did the test with low speed setting and higher speed settings. With low speed I had 40v and higher speed around 60v ac. I will connect my Land Rover FFR batteries, maybe a larger load work. Quote Link to comment Share on other sites More sharing options...
ruxy Posted January 9, 2019 Share Posted January 9, 2019 (edited) 7 hours ago, Foxtrott363 said: I checked it with and without a battery connected. Same results. The manual says that the load can be connected before starting or while running, with the main switch off, so I tried both, but the resistors and capacitors in the control box started to melt and had to be exchanged. No i don't have a tacho on it. I did the test with low speed setting and higher speed settings. With low speed I had 40v and higher speed around 60v ac. I will connect my Land Rover FFR batteries, maybe a larger load work. That will give you the option of the Range Setting of 14 or 28 , unfortunately I don't have any paperwork at all - so you are better informed than I. Have intended obtaining Info. from Green Machine Surplus but never got around to it. I just used my loaf , pondered on the MCB switch , coupled to Lightweight FFR starting batteries in series, ran it for a short while to drain the small qty. of petrol in the Jerry. Nothing melted or blew up , so boxed it up again. Edited January 9, 2019 by ruxy spelin Quote Link to comment Share on other sites More sharing options...
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