Re: The devil made me do it

As I mentioned earlier, I think I'll cut my losses and scrap the controller. BTW
the controller will still drive the motor in forward and reverse but the armature
is only getting about 19 volts at minimum speed and 36 volts at a slightly higher
RPM. Perhaps 150 RPM. In addition to that the "ON" breakers are now chattering
and I have to hold the "ON" switch for a second or so to get it to latch.

Better scoot now. Thanks Bill


William Noble wrote:
if you want to fix the electronics, start by providing some information - like what is it, is there any visible damage, and a photo. As others pointed out, it's most likely diodes and SCRs and transistors that are damaged, the older drives are easy to fix, just find all the bad parts and replace them - newer ones have surface mounted parts and custom VLSI and are much harder to work on. SCRs cost a dollar or two each, you can look up by part number what the specs are and buy a modern number.

so, have you actually tested the motor? a car battery provides enough voltage to run a 100 V motor, just energize both the field and armature and see if it turns
"Ted Samuels" <t.samuels@xxxxxxxxxxxx> wrote in message news:fc8q4h$9fd$1@xxxxxxxxxxx
William Noble wrote:
if there is electronics, it's most assuredly damaged - power the motor separately
from the electronics and see if it works, if yes, then you at least know where to
look - a modern DC motor control is not too expensive though and there are a lot
on ebay, otherwise look at Minarik.com they make nice ones


I was hoping to get a steer in the direction of what's most likely damaged . In
any case I gave myself a good lesson on reversing.

Thanks again T
Thanks William (Bill)

Yes, I expect my adventure will cost me the price of a new controller. Kind of a shame.
It was a nice setup. I suppose I could still use it to provide the field current and
a variac with a rectifier for the current to the armature. I enjoy tinkering.

The lathe is already powered so there is no urgency. I just thought the reverse and
variable speed of the DC motor would have been a nice touch.

Thanks for the good advise.
T



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