Re: G201-IP

--- In CAD_CAM_EDM_DRO@y..., "mariss92705" <mariss92705@y...> wrote:

> Hi,
>
> I have breadboarded a protection circuit for the G201. It protects
> against:
>
> 1) Shorting any or all motor wires to ground.
> 2) Shorting any motor phase to phase.
> 3) Miss-phased motors (series or parallel).
> 4) Miss-connected motors.
> 5) Internal motor winding shorts (serial-killer motors).
> 6) Motor connects/disconnects while under power.
> 7) Motor winding short to motor case.
> 8) Unused 6-wire motor leads touching/shorting anywhere.
>
> These are the most common drive failure problems (>95%) that we see
> for return/repair.
>

Are those warranty repairs that you have to pay for, or customer
induced damage that they have to pay for? If warrenty, what is
it worth to you to eliminate 95% of your returns?

> What I am throwing out to the group here is:
>
> (1) Is it worth the effort to do this?

Yes.

> (2) Is it worth a $15 premium to have this protection?
> That is the all-up cost of the additional parts.
>

I would pay it. Not so much because I think I'd screw it up,
but because I prefer bulletproof drives. I design larger
motor drives at work, and all of our drives MUST survive
a short on the output, in order to meet UL508 which is a
requirement to sell them. I realize that UL is not a factor
in your products, but the extra ruggedness is a selling point
anyway.

> If I'm going to do this, my schedule has it for the end of
> the first quarter. What I'm looking for is feedback if this
> is wanted/needed.

Definitely wanted. I haven't ordered my drives yet, other
projects keep interfering with my CNC project. When I do, I'll
order the IP version. And I'm just a hobbiest, where initial
cost is important and the cost of down-time is low. Have you
asked your commercial customers about this yet? I imagine
they value ruggedness even more than I do. When their end
users blow up a drive, they hear about it first.

John Kasunich