On Wed, 20 Jun 2007 12:29:40 -0700, "Enhanced Machine Controller (EMC)"
<[email protected]> said:
>
>>Further investigation produced this document:
>
>http://www.wallacecompany.com/cnc_lathe/Servo_Schem.png
<s>
>if I decide to use these drives. Performance-wise, does anyone
>have an opinion on whether to stick with the existing velocity amps
>(which overall will cost more) or go with new torque-mode PWM amps?
Performance-wise these are some pretty hot amps. You've got to watch for
shorting of the motor as the brushes over time create an arc path to the frame.
That arcing will burn the curent sense resistors, the large ones along the
edge of the card, and short out the transistors. Most of the time this happens
fast enough that the board traces are fine.
Because of their age you will have to tune them often. I was tuning these
every 6 months and that was years ago. The alternative is to replace all the
caps.
I've got a pile of these and several motors in the shop if you need spares.
Rayh
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