RE: [CAD_CAM_EDM_DRO] Looking for assistance in connecting COMPUMOTOR DB DRIVE

Eric,

I have a 3 Compumotor DB drives (P/N 88-006895) that are similiar in
appearance to the one described below.
(Black case, approx 5 x 8 x 1 inches in size)
They are TERRIFIC controllers... I'd love to get my hands on one or two
more.
This is from some handwritten notes that I received when I bought my
controllers. Your mileage may vary...


CURRENT = 1A Output Drive per 1K Ohm of resistance
Up to 4K Ohms. Max current is 4 Amps.

Use of a 1% resistor is recommended, but I run mine with a standard 10%
(Check value if going for max current (4K). I don't know if its over-current
limited)

Just connect a resistor between the pins.


RES = Resolution (This is a microstepping controller, 20Khz fixed
frequency chopper)


Resolution A B C
----------------------------------
25000 1 1 1
25400 0 1 1
18000 1 0 1
10000 0 0 1
5000 1 1 0
2000 0 1 0
400 1 0 0
200 0 0 0

The inputs float normally high (1 state) +5 if unconnected, 0 state is tied
to LOGIC.
All resolutions assume 200/steps revolution motor.
DO NOT TIE LOGIC GROUND ANYTHING BUT THE A, B or C inputs.


STEP and DIR inputs
Connect to your parallel port of PC using software defined pins
I have the (-) side of each tied together and going the ground
of the parallel port.

STEP signal requires 1 uSec min pulse @ 20ma
(The inputs are optically isolated so you need the current to drive the
optoisolators)

DIR must be stable for 80us before step is received.
logic 1=CW 0=CCW

Motor = 4 lead typical, if using 6 lead center taps unconnected.
8 lead motors can be either series or parallel connected (Check current)

Hope this helps,
Paul D. Fincato




-----Original Message-----
From: eric_mack@... [mailto:eric_mack@...]On Behalf Of
glee@...
Sent: Monday, January 14, 2002 7:05 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Looking for assistance in connecting
COMPUMOTOR DB DRIVE



I have 2 COMPUMOTOR DB DRIVE units which I would like to make use of.

I am trying to identify the functions of the wires that connect to these
units.

I would appreciate any feedback or links to web site as you may have.....

Also, any comments from anyone who has actually used these drives woudl be
welcome.

-Eric Mack

============================================================================
====
Pinouts for COMPUMOTOR DB DRIVE

On the LEFT side of the controller is an 8 position screw terminal which
looks like the power and motor side. It is labelled as follows:

B+ To Motor
B - To Motor
A + To Motor
A - To Motor

- 12-48V DC IN
+ 12-48V DC IN

CURRENT (No idea what this is for. Is this also tied to the DC
Supply voltage?
LOGIC GROUND (Do I just tie this to the PC Controller Ground and/or
to chassis ground?)



On the RIGHT side of the controller is an 8 Position screw terminal which
looks like the controller side. It is labelled as follows:

LOGIC GROUND (Do I just tie this to the PC Controller Ground and/or
to chassis ground?)

RES SEL A (No idea what this is but "A" is jumpered to "B" and
"C" Is not connected)
RES SEL B (No idea what this is but "A" is jumpered to "B" and
"C" Is not connected)
RES SEL C (No idea what this is but "A" is jumpered to "B" and
"C" Is not connected)

DIR - (I assume that this goes to the direction pin on
the controller?)
DIR + (I assume that this goes to the direction pin on
the controller?)

STEP - (I assume that this goes to the step pin on the
controller?)
STEP + (I assume that this goes to the step pin on the
controller?)





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