New Build King Rich KRV-3000 Knee Mill with GSK AC Servos DA98B driver

[dmbgo]

Hi, after several years I have gotten my spare Acorn board off the shelf and started to configure a new controller for my King Rich KRV3000 mill.

I have been using the Acorn board on my CQ6230 lathe for a couple of years now, with Adtech servos, with excellent results and no real issues.

My initial problem is getting the GSK DA98B AC Servo controller to work with the Acorn board. The DA98B AC Servo controller is driving a 110SJTM040D servo motor.
The motor was working fine on the mill, and was being driven by this particular GSK DA98B AC Servo controller.

The GSK 980MDA on the mill drove the servo motors via a DB15 connector on the rear of the controller, and I have used the diagram in the 980MDA manual to replicate the servo drive connection as far as possible, (with my limited knowledge).
The factory cable from the DA98B AC Servo controller to the 980MDA, has a DB15 connector on the end going to the 980MDA and he factory cable's pin out was in the manual.

Here's how I have configured the servo driver connection to the Acorn so far, but it's not working yet:

Acorn Step (ST1) to DB15 pin 1 which is CPn+ and goes to DB44 pin 30 on the DA98B Servo driver (PULS+)
Acorn (COM) to DB15 pin 9 which is CPn- and goes to DB44 pin 15 on the DA98B Servo driver (PULS-)
Acorn (DIR) to DB15 pin 2 which is DIRn+ and goes to DB44 pin 29 on the DA98B Servo driver (SIGN+)
Acorn (COM) to DB15 pin 10 which is DIRn- and goes to DB44 PIN 14 on the DA98B Servo driver (SIGN-)

The signals from the servo driver that are not connected to the Acorn yet are:
DB15 pin 5 ALMn
DB15 pin 3 PCn
DB15 pin 11 0V
DB15 pin 4 +24v

I'm hoping someone has some knowledge of what the signals are and where to connect them, also any advice or observations about my existing connections would be welcome as well.
Thanks in advance
Dave

[cnckeith]

can you find the manual online to the DA98B AC Servo drive? if so, post a link here and that would give us a good idea on how to connect it up to the Acorn.

[dmbgo]

Sorry Keith, I meant to post it, but forgot.

DA98B AC Servo Driver User Manual (2016_08_01 01_00_21 UTC).pdf

(1.97 MiB) Downloaded 9 times

[dmbgo]

This is the connection diagram for the interface between the DA98B and the GSK servo controller.

Well actually it's not, I get a message when I try to upload the diagram that says "Sorry the board attachment quota has been reached".

[dmbgo]

The connection diagram that I used as a starting point is on page 278 of this GSK980mda manual:
https://www.automationtechnologiesinc.c ... Manual.pdf

[dmbgo]

I'm still not sure that I have it right, since further reading has made me wonder if I am "sinking" or "sourcing" the signals. I think the way I have it connected I think I am "Sourcing" the signals, because I have the positive 24v step and direction outputs connected to the controller from the Acorn board, and the negative side of the Acorn power supply connected to the "common" terminal on the Acorn board, the step and direction outputs from the Acorn board connect to the +puls and +dir on the AC servo controller.
Should I try inverting the signals with the Acorn wizard to see what happens? Or alternatively, should I leave things alone and just swap the step and direction outputs, so that the active line is negative and make the common terminal on the Acorn +24v instead of -24v?

[cnckeith]

The connection diagram that I used as a starting point is on page 278 of this GSK980mda manual:
https://www.automationtechnologiesinc.c ... Manual.pdf

okie dokie, i asked chuck to take a look at it for you and provide some guidance.

[dmbgo]

Thanks Keith

[dmbgo]

Here is the connection diagram provided by GSK between the GSK 980MDa CNC controller and the GSK DA98B AC servo drive.

[dmbgo]

What I have done so far, with no movement of the servo, is to connect the factory DB15 connector (as in the above photo) to the Acorn.

This involved the following connections:

CPn+ to ST1 on Acorn board
DIRn+ to DR1 on Acorn board
CPn- and DIRn- to Com (0v) on Acorn board
24v from PSU to H4 24IN on Acorn board
0v to COM on power supply
ALMn to IN5 on Acorn board (Commoned up all axis alarm signals)
Servo reset signals for X Y and Z, are on the first 3 relays of the Acorn 8 relay board

I've obviously done something wrong, or left something out? One thing is that there seems to be nothing connected to the ENx connection on the Acorn. I'm assuming this is an output?