Strange analog output voltages from mesa 7i33

Hello,
I am setting up a machine with mesa 5i20 and 7i33 for the servo control.

I am running in to strange voltages between my drv1-4 pins and ground (the +/- 10v signals for my drives)

Here is what I get:

Machine on but emc not started: 1.29V + on between all drv pins and ground.

Machine on/emc started/ axis not enables: 1.11V Some are positive and some negative. (I imagine this is due to values in my ini. file

Machine on/emc started/ axis enabled: 1.22V positive and negative,

In both the examples with emc on above hm2_5i20.0pwmgenxx.value shows zero as I would expect.

When I jog the axis it goes much faster in one direction than the other, I imagine this is due to my voltage imbalance.

Seems like this could be fixed with a OUTPUT_OFFSET value in my ini. file, but hostmot2 does not read this right? Is there another way to correct for this?

Of course I would like to fix the actual reason the voltages are there at all. Could it be a hardware problem? A grounding problem? Something else obvious I am missing?

Thanks in advance for any help.

Justin

If you have 1.29V output from the DRV pins, Something is really really wrong

I would:

1. Disconnect 7I33 from machine (all encoders/analog signals) but leave connected to 5I20
2. Power up machine but dont start EMC
3. Check analog output voltages (these should be no more than 15 mV)
4. Check LEDS (the 7I33TA should have 3 LEDs illuminated)
5. Check 5V at 7I33
6. Make sure you have nothing connected to the 7I33 enable outputs (I mention this because many people use these inappropriately, they are just TTL level status outputs)

Ok,
Nothing plugged in to the 7i33 at all except the ribbon cable to the 5i20

I still get 1.29V

Between 5v and ground I get 5volts on with both the power through the ribbon cable and external 5v when I connect it.

3 leds toward the center of the board are green and one led at the bottom of the ribbon cable next to the "3.3V" is also on.

Thanks.
Justin

Well if your voltmeter is good and you measure 1.29V between DRVN and the adjacent GND terminal
I would say the 7I33 is thoroughly fried...

That was my suspicion... I don't know what could have damaged it, Oh well. I will order a replacement Monday. Thanks for the help.


Justin

I put a new battery in the meter. Same readings. It also reads other know voltages fine...

When I first installed in it did not work at all, and I found out that it was do to a poorly made ribbon cable. Perhaps some wires were crossed and it got damaged there. I remade the ribbon cable and it came on, encoders and everything else seem to work fine. There is no visible damage on the board....

Justin

We can issue you an RMA today sometime. I would send both the 7I33 and 5I20 back to verify that they are both OK

Hello thanks again for the help. I will send in both cards. I got a RMA on Monday.

Justin