Hi Mick,
Thanks for the links but makes no sense to me to buy used motors when I can get branded stuff at such a great price
COST. If I were to buy new, admitting that the drive has now been superseded, I would have had to shell out over $4000NZD for my MPL-A430H
and 2098-DSD-020 drive.
I agree that because you can buy Schnieder at such a good price then new makes sense, if you were paying list price or even with a good trade discount
on the list price (which is basically what I was offered by one of our electrical suppliers) they are still beyond my means.
My experience is that the only wearing parts of a an AC servo is the bearings. My servo came from a carpet factory, I don't know how much work its done,
but it hasn't 'worn' per se. If anything I would be more suspect of a secondhand drive, they are fairly high strung units. As you know electronics devices
don't wear in the same manner as mechanical devices, having said that it will 'let go' at some time. Allen Bradley is a superb brand and I do not expect their
device to have any design weaknesses. Fortunately these particular drives are very plentiful on EBay and very reasonably priced if being selective even should
it 'go South' on me.
As it turns out that this secondhand unit, by the time I bought/made the cables and bought the setup software worked out about the same price as a new
Delta of the same power. Hence my recommendation to pay attention to the availability of cables and the price. Likewise I ended up buying from
our local Rockwell Automation distributor the setup software, cost $200NZD or about $120US. While I might have got a new Delta for the same money
I am very happy with the Allen Bradley, I've knocked up about 500hrs on it so far. Additionally the learning experience I got from perusing manufacturers
data, searching for secondhand units, making my own spindle complete with angular contact bearings and RegoFix toolholder has been worth any premium.
Craig