Hello all, I know this subject has recently been aired but I could do with some help.
Turning brass which picked up a few times stalling lathe. Finished job but lathe dead next time used . well not quite dead. With speed turned up chuck re-acted against being turned by hand.
Im limited on electronics knowledge but have thus far checked the diodes and SCRS (seem to gate) with a dc load, checked the 5k pot and run the motor on dc. Ive now got the KBIC 240 board on the bench with 230ac, the pot and motor wired. The 5k wirewound resistor (r17a) gets hot within approx 10s of power on.
Got 20vdc across quad op amp. Only a few mvs (not varying) on SCR gates wherever pot set.
Now stuck!
Any help/info greatly appreciated.
Turning brass which picked up a few times stalling lathe. Finished job but lathe dead next time used . well not quite dead. With speed turned up chuck re-acted against being turned by hand.
Im limited on electronics knowledge but have thus far checked the diodes and SCRS (seem to gate) with a dc load, checked the 5k pot and run the motor on dc. Ive now got the KBIC 240 board on the bench with 230ac, the pot and motor wired. The 5k wirewound resistor (r17a) gets hot within approx 10s of power on.
Got 20vdc across quad op amp. Only a few mvs (not varying) on SCR gates wherever pot set.
Now stuck!
Any help/info greatly appreciated.