Your testing technique is good. I don't know the particular servos that you have, but on my BP, the servos have a tach feedback. Since the runaway condition happened on 2 different motors but the same drive, either the input from the tach feedback may be bad, or you've got a output device (transistor?) shorted. The output is more likely the case, since the output bridge could have shorted during power up, causing the fuse/breaker to blow.
________________________________ From: Ben Potter <b...@bpuk.org> Sent: Saturday, March 4, 2017 4:33:27 PM To: emc-users@lists.sourceforge.net Subject: [Emc-users] Bridgeport servo troubleshooting Good afternoon, I've got a converted Bridgeport Interact which decided to give up the ghost last week. I think that one of the servo drives/amps is dead, and am hoping that someone can sanity check my troubleshooting before I start spending money. Before I removed any wires, I checked the wire numbers against the schematic and put everything back in the same place. Fault: On power on, blows fuse/breaker. Diagnostic: 1: Remove power + HV bus from X, Y, Z drives Powered up, no axis movement possible 2: Connected power + HV bus from X drive Powered up, X movement OK 3: Connected power + HV bus from Y drive Powered up, X + Y movement OK 4: Connected power + HV bus from Z drive Blew fuse 5: Removed X drive, put Z drive in place of X On power up X motor ran at maximum speed until I hit e-stop 6: Put Z drive back in place, replaced X drive. Disconnected motor connection only from Z drive On power up X and Y movement OK. 7: Reconnected Z motor to Z drive On power up Z ran at maximum speed until I hit e-stop I'm pretty sure that the Z drive is dead - can anyone suggest any other tests I should do? Thanks Ben ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
