Hello,
We have bought the PCI 7390 and MCA 7790 boards in order to control Panasonic Motors. Specifically, we want to control the MADDT1207 and MADDT1207N servo drives for MINAS A4/A4N motors.
Our firs trouble is with the MADDT1207N servo drive, wich does not have direct conectivity with the MCA 7790 board. We have a 50 pin SCSI cable to connect the MADDT1207 with the MCA 7790, and it works more or less ok, but the MADDT1207N has a 37 pin connector instead of 50 pin. My question is, is there any way to connect them. Does National Instruments sell a special cable for this?
I use Measurment & Automation to test the boards with the MADDT1207 servo drives (the 50 pins one), and after some time to configure both, the MADDT1207 and the Measurment & Automation program, I am able to move the motor. Ten points for NI!! Its quite easy if you take some considerations. But what I am not able to, is to get the encoder data correctly. I know this data is transferred by the OA, OB and OZ differential signals. If I go to Measurment & Automation->NI Motion Devices->PCI 7390->1D interactive->Advanced Tab->Advanced Data group box, there is a field that says Encoder, and it ontly changes between 0 and 1, so I believe the data is being transferred, but the PCI 7390 does not understand MADDT1207. Looking at the panasonics manual, I realized that each differential (OA, OB, and OZ) pair must be terminated with a 330 ohm parallel resistor. This is my second question, does anybody know if I have to put this resistor? I measured with the multimeter and the pair is terminated with high impedance (no resistor). I tried to put a 330 ohm resistor in the MCA 7790 board (just between the connector pins), but nothing changed. I know the resistor must be at the end of the pair, but I would not like to solder the resistors in the PCI board if its not needed.
In the Encoder Settings in Measurment & Automation->Default 7390 Settings->Axis 1, I have disabled the Filter Fequency field, I put 10000 counts per revolution, and I tried with several combinations of Polarities and Index References Criteria.
In the Servo parameters I have:
44 (number of output pulse ratio) = 2500 (counts per revolution)
45 (denominator of output pulse ration) = 0 (wich means x4 (= 10000), is used)
46 Pulse output logic inversion = 0 (no inversion)
47 Z-phase of external scale set up = 0 (Z-phase output of external scale becomes invalid)
Any ideas? Does anybode succeeded with the encoder?
Thanks in advance
