Mori MVJR Build Log

first, output type _must_ be 2 for 7I48

I tried setting the output type to 2 but with that setting the spindle just turns about 5 rpm and has a high pitched whine.

When the output type is set to 1 it turns about 100 rpm and sounds normal, I just don't have control of the rpm.

I tried setting the scale to -6000 and it does reverse direction.

Just to make sure i have the 7i48 connected properly:

I have 2 wires connected relating to the spindle:

pin 23 to COMS

and

pin 24 to SGS1

I'll try testing the voltage next.

Please Please Please do not use any other mode than 2 for a 7I48
This is not an experiment. This is how the hardware works.

Then verify that the 0-10V works unconnected to the drive

If that works connect to drive and check again

PCW wrote:

Please Please Please do not use any other mode than 2 for a 7I48
This is not an experiment. This is how the hardware works.

Then verify that the 0-10V works unconnected to the drive

If that works connect to drive and check again

I disconnected the wires from 23 and 24 then set the spindle speed to 6000, the voltage was 9.99

Checked the wires in the diagram to make sure they were right again, it is as described above.

Reconnected, no change.

OK so the next question is:
is the voltage still 9.99V when connected to the spindle drive?

Good question:

When it is connected to the drive

Using MDI:
When the S is 6000 using M3 voltage is 0.639
When the S is 500 using M3 voltage is 0.610

Using the manual page
Pressing the spindle rotate button gets voltage 0.02

OK so it looks like you have a dead short (perhaps a diode) across the 7I48 outputs
I suggest you disconnect the 7I48 before something gets damaged

You need to fix this
Are you absolutely sure about the polarity?
the ~.6V sure sounds like a diode across the 7I48 outputs

Before you go further I would verify that you can drive the spindle to almost full speed
by connecting a 9V battery with a 1K Ohm series resistor to the spindle drives
analog input (disconnected from the 7I48 of course)

PCW wrote:

OK so it looks like you have a dead short (perhaps a diode) across the 7I48 outputs
I suggest you disconnect the 7I48 before something gets damaged

You need to fix this
Are you absolutely sure about the polarity?
the ~.6V sure sounds like a diode across the 7I48 outputs

I'm not understanding your question about the polarity but i think you might be on to something.

I just checked the wire that connects to pin 25 and it has -24volts.

I don't know what to do though.

OK sounds like either you have the wrong wires on the spindle drive or its not anything
like a 0-10V analog driven spindle. -24V should be kept a long long ways away from the 7I48

Polarity meaning the voltage relative to ground (common) the black meter lead should always be on ground so we are talking about the same things here


Try the battery thing, if that doesnt work you are not going to have any luck with the 7I48 and unlike the 7I48 you are lot likely to destroy anything with a mis-connect...

I just checked one other thing.

There are two wires that I have been using that come form the spindle drive,

One is identified as COMS
One is identified as SGS1

I assumed that COMS was a ground but it is also -24V.

I have no clue what to do now. Any ideas.

Sorry I didn't understand what you meant by the "battery thing" are you suggesting connecting a 9V batter to the wires to see what happens?