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| PekkaNF:
--- Quote from: John Hill on January 18, 2015, 04:21:29 AM ---I managed a little surgery on the transformer taking 5 turns off the top of the secondary, no load voltage is now 56 volts which I thought would be comfortably within the 60V spec of the driver however stalling the motor causes the driver to go into alarm, I dont know if that is over voltage or over current. :palm: --- End quote --- My limited experience tells that if the drive has regenerative braking and it is decelerating you may get over voltage if the feeder is weak (can't absob current and that will cause voltage rise). Overcurrent means too fast ramps or too much torque demand. Pekka |
| vtsteam:
The driver seems weird though. If it says 60V spec, and you can set the current (usually with a DIP switch setting), it should handle everything in a 56V setup. It is supposed to limit current, and it is supposed to operate with 60V input, and it is supposed to operate a motor and hold position, when needed, (ie a stall) so what should be wrong? Is the 56V clean DC? Are you running through a rectifier bridge with adequate filter caps? The only other possibility is that there's some current rating for the driver (not the current setting), and it doesn't like the low resistance of your motor @ 56V -- 56V pushes too much current for the driver max rating. |
| vtsteam:
One more thought: 56V is measured DC after the bridge and caps -- I hope, not just the AC (or Xformer rating)......... DC would be considerably higher if it is..... |
| awemawson:
IIRC the original Gecko drives needed a large electrolytic capacitor close to the driver 'to absorb the over run current' |
| John Hill:
The voltage is measured at the filter capacitor which is a beer can sized 3600 150VDC. I can add capacitors on the motor leads but that seems counter productive. Maybe I should take my wife on a two hour drive and buy some 56Volt zeners. :coffee: This is a 3 phase motor so I guess I would need half a dozen diodes. |
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