I've managed to blow up a small DC motor and controller board. Yeah! I
know.
But brain wasn't in gear...!! :-(

The motor was shunt wound, fractional HP.

I have a shunt wound replacement board, but not the right kind of
motor.

The usual combination of the wrong gearing or something.

Question is can I hack a shunt wound board so as to drive a
series wound motor?

I case it helps, the board is a Penta Power KBIC board. I've
considered contacting the manufacturer but I don't think that
anyone at the company would want to encourage me to hack
up their boards.

Tanks for any help.

DOC

Buy my junk...
http://www3.sympatico.ca/doc/robotone/for-sale.html

On Wed, 3 Jun 2009 12:55:55 -0700 (PDT), wrote:

I've managed to blow up a small DC motor and controller board. Yeah! I
know.
But brain wasn't in gear...!! :-(

The motor was shunt wound, fractional HP.

I have a shunt wound replacement board, but not the right kind of
motor.

The usual combination of the wrong gearing or something.

Question is can I hack a shunt wound board so as to drive a
series wound motor?

I case it helps, the board is a Penta Power KBIC board. I've
considered contacting the manufacturer but I don't think that
anyone at the company would want to encourage me to hack
up their boards.

I don't think you need to hack anything. Connect the motor to the
armature terminals on the KBIC and ignore the field connections, which
is the way you connect a PM motor to a KBIC. The speed regulation will
be awful to non-existent, but that'll be true of a series wound motor
any way you connect it, unless you have some sort of feedback.

By the way, KB supplies troubleshooting and repair directions for
their drives. If one fails, it's more often than not the output SCRs.

--
Ned Simmons

wrote in message
...
I've managed to blow up a small DC motor and controller board. Yeah! I
know.
But brain wasn't in gear...!! :-(

The motor was shunt wound, fractional HP.

I have a shunt wound replacement board, but not the right kind of
motor.

The usual combination of the wrong gearing or something.

Question is can I hack a shunt wound board so as to drive a
series wound motor?

I case it helps, the board is a Penta Power KBIC board. I've
considered contacting the manufacturer but I don't think that
anyone at the company would want to encourage me to hack
up their boards.

Tanks for any help.

DOC



so, why not repair the controller? generally the triacs (or SCRs) take the
fall, maybe a driver or two

On Jun 3, 1:11*pm, Ned Simmons wrote:



I don't think you need to hack anything. Connect the motor to the
armature terminals on the KBIC and ignore the field connections, which
is the way you connect a PM motor to a KBIC. The speed regulation will
be awful to non-existent, but that'll be true of a series wound motor
any way you connect it, unless you have some sort of feedback.

I did try this but the motor barely turned. And the voltage reading
across
the terminals was almost nill.


By the way, KB supplies troubleshooting and repair directions for
their drives. If one fails, it's more often than not the output SCRs.

Haven't blown one up yet. Maybe that's the next step! :-)

Tanks,
DOC



--
Ned Simmons

On Jun 3, 10:03*pm, "Bill Noble" wrote:

....


so, why not repair the controller? *generally the triacs (or SCRs) take the
fall, maybe a driver or two

That was plan A. But I had some spare Penta Power boards. And since
this project
has been weighing upon me for TOO long now...

Tanks,
DOC

wrote:
On Jun 3, 10:03 pm, "Bill Noble" wrote:

...

so, why not repair the controller? generally the triacs (or SCRs) take the
fall, maybe a driver or two

That was plan A. But I had some spare Penta Power boards. And since
this project
has been weighing upon me for TOO long now...

Tanks,
DOC

How about a DC treadmill motor - and, what model KBIC?
/mark in BC

On Thu, 4 Jun 2009 06:34:31 -0700 (PDT), wrote:

On Jun 3, 1:11*pm, Ned Simmons wrote:



I don't think you need to hack anything. Connect the motor to the
armature terminals on the KBIC and ignore the field connections, which
is the way you connect a PM motor to a KBIC. The speed regulation will
be awful to non-existent, but that'll be true of a series wound motor
any way you connect it, unless you have some sort of feedback.

I did try this but the motor barely turned. And the voltage reading
across
the terminals was almost nill.


Are you sure the drive and motor are both good? What's the HP resistor
installed in the KBIC -- it's the big plug-in power resistor with a HP
rating printed on its side.

Other random confounding possibilities:
IR compensation, MAX speed, and current limit pots
inhibit terminals must not be jumpered

BTW, a lamp dimmer or plain old rheostat will control the speed of a
series wound motor. The KBIC doesn't differ too much from the lamp
dimmer, except it monitors the motor's back EMF (KB calls it IR
compensation) to improve speed regulation, which I don't think will do
much for the speed regulation of your motor. But I wouldn't expect a
series wound motor to confuse the drive to the point that it wouldn't
run the motor at all.

--
Ned Simmons

Uh... Brain disfunction again!!

I've got one of each.


KBIC 240 DS and
KBIC 240 D

DOC

On Jun 4, 6:51*am, Mark F wrote:
....


How about a DC treadmill motor - and, what model KBIC?
/mark in BC

If I can find one. Gonna take a look at a lawn mower motor. Also
if I can find one.

DOC

Buy my junk...
http://www3.sympatico.ca/doc/robotone/for-sale.html