Peter.
Titanium
- Joined
- Mar 28, 2007
- Location
- England UK
Over the past week I have had my lathe trip the RCD in the workshop feed panel, always when the machine has warmed up and sometimes apparently triggered by parting-off chatter though whether it's the load or the chatter that's the cause I could not say. It's been giving me a headache because it's a fault that will right itself when I am looking for the cause, or when I've got fed up scrabbling about in the dark for the reset switch and left it until morning.
When it does trip the RCD if I reset it then it pushing the green start button will knock it off again right away.
Last night it went off again, only this time the fault has remained this morning with the machine stone cold. I've worked my way through the machine with a meter until I think I have found the source of the fault. I had 600ohms between the (MG) end of the E1 wire and the earthed chassis. I opened the DC panel up to trace the other end of the E1 wire (which should be the DC- supply to the panel/field) and the problem went away i.e I no longer have 600 ohms from E1 to earth.
(Worth noting that there is no MG in my machine. Field/panel voltage is provided by a variac and capacitor and armature power by a 1Q DC drive. The DC panel is however all-original and uses the original features including the ohmite for field weakening. Only the 115v feed to it is changed.)
I've studied the panel and all the internal connections and I can't find any obvious fault. I suspect that I have a condenser failing since looking at the diagram it seems that E1 from the MG is connected to K1-2 terminal then goes through the overload to the condenser and nowhere else, but my electrical knowledge is weak and I want to put it out here for opinions/suggestions.
Any assistance would be greatly appreciated.
When it does trip the RCD if I reset it then it pushing the green start button will knock it off again right away.
Last night it went off again, only this time the fault has remained this morning with the machine stone cold. I've worked my way through the machine with a meter until I think I have found the source of the fault. I had 600ohms between the (MG) end of the E1 wire and the earthed chassis. I opened the DC panel up to trace the other end of the E1 wire (which should be the DC- supply to the panel/field) and the problem went away i.e I no longer have 600 ohms from E1 to earth.
(Worth noting that there is no MG in my machine. Field/panel voltage is provided by a variac and capacitor and armature power by a 1Q DC drive. The DC panel is however all-original and uses the original features including the ohmite for field weakening. Only the 115v feed to it is changed.)
I've studied the panel and all the internal connections and I can't find any obvious fault. I suspect that I have a condenser failing since looking at the diagram it seems that E1 from the MG is connected to K1-2 terminal then goes through the overload to the condenser and nowhere else, but my electrical knowledge is weak and I want to put it out here for opinions/suggestions.
Any assistance would be greatly appreciated.