Re: G201 modifications/update (P.S.)

Mariss,

My comments in this thread concern what to do when an EMERGENCY
situation presents itself. I will gladly trade a drive for a flying
tool bit(and the damage it can do to a person)or "sliced" finger
EVERY time.

It is worth noting that your experiment shows what the filter cap
could see, and this IS worth doing something about(explosions rate
right up there with the other things mentioned :-) )

I hope this explains my position.

Ballendo

>Mariss wrote:

<snip>I picked a drive (G201 of course), hooked up a size 34 motor
rated at
4 Amps per phase, set the power supply to 40VDC and accelerated the
motor to 10,000 full steps per second (3,000 RPM). I placed a scope
probe on the supply voltage at the drive. While running:

1) I disconnected the supply wire at the drive. The voltage peaked at
91 VDC at the drive.

2) I gated the STEP pulses off. The voltage peaked at 94 VDC at the
drive.

Conclusion (1): Don't do that! The drive survived with no damage but
doing that is hard on it. Lower voltage rated drives would have died
on the spot at that speed. The G201 would have died if the speed had
been higher.

Conclusion (2): Power a drive down by powering down the power supply.

Conclusion (3): Don't shut off step pulses at high speed, decelerate
them.