|
You should see about 42 VDC with the pack disconnected. No lower than 40, I'd say. You should see about 90VAC across the secondary before the diodes. It will be roughly 45VAC to the centertap ground from either side. I am not sure why you only have 8-10 VAC now, but could be a shorted capacitor. You can check for that with a multimeter on resistance. You should have much less than 5 VAC on the secondary after the diodes when it's working. A bad capacitor will show higher AC on the output. Chad ------ Original message------ From: Christopher Zach Date: Sat, Dec 5, 2015 5:13 PM To: elec-trak cosmos phy tufts edu; Subject:(ET) Weird charger failure So the old charger on my E15 (wreck-trak) stopped working this summer, and this fall I figured I would check it.Symptom was no charging, 110 on primary, transformer was very hot after being on all night.Power to 36 volt molex line into charger: Check and ok.Voltage across diodes: .6 volts, checkVoltage across secondary BOOM shorted a diode by mistake.Raw AC from secondary: 8-10 volts or so. Odd.So on a lark (and since I blew a diode) I replaced both diodes, cleaned up the connectors, and tried it this evening.Fail. No charging at all.Did I actually have the transformer fail? What kind of voltage AC should I see between the transformer secondary poles and what DC should I see on output with the charger disconnected from the pack?Drat.C_______________________________________________Elec-trak mailing listElec-trak cosmos phy.tufts.eduhttps://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak |