danaher p70360 drive issue

[mark514]

Hello,

I am using Danaher P70360 drive connected to UMI-7772 and NI 7330 card to control T21NRLC stepper motor. I have been using this drive for a while now without problem.

I happen to have 5 other P70360 drives, and I recently tried another one with another T21 stepper using the same setup as above. With this other drive, the motor suddenly halt when only a small torque is beeing applied on the shaft, while when switching back to my previous P70360 the motor runs fine.

I have tried all other 4 P70360 drives and the same issue happens; only my first P70360 drive seems to "work" correctly.

But then, when opening the case of all 6 drives, I see that the 5 drives that I am having issue with have the same kind of "model number" written over the dip switches, while the number written on the "good" P70360, the one working correctly, differ from the 5 other drives (see attached pictures, number is on the right of the red part; the "good" drive numbe is 0820U 3 1).

Still, it is not obvious that the different "model number" be the source of the issue here, but I could not find anything else that could be wrong.

Any ideas?

Thank you

[AnalogKid2DigitalMan]

Look in the manual for what the function of DIP Switch #11 is. That one is set in different positions between the two.

It sounds like the holding current setting is too low on the motors that stall out.

-AK2DM

[mark514]

DIP #11 is multistepping. I have already tried switching it, and also dip #10 which is current reduction.

When the rotor stalls, the sound of the motor becomes more grave. I have also noticed that the sound intensity of the "good" drive is much higher than the other drives. It indeed seems like there is not enough current sent to the motor...

[AnalogKid2DigitalMan]

Is S1 set correctly per the manual Section 3?

Do you cycle power between changing settings?

You may want to use the P7000 tools to download setup on the drive that works and upload into a non-working drive. Also check for firmware differences between them.

http://www.ni.com/pdf/manuals/P70360manual.pdf

-AK2DM

[mark514]

Yes, S1 is set for my T21 motor (S1=1 and S2-1=OFF). 

I always power cycle the unit when switching the dips.

Since I am connecting the drive to UMI-7772 and controlling via NI 7330 card, I do not use P7000 tools (I also do not have the approriate serial cable to connect the drive directly to the pc). Is there any way to import the settings of the drive with NI-MAX? I can change the settings associated with the 7330 card in MAX, but I can't see the actual drive settings. 

Thank you

[Andy-C]

Hello Mark,

This sounds like a very strange problem indeed. Unfortunately, NI-MAX cannot be used to load or import configuration settings for this drive. Are you using the same axis on the 7330 and UMI when testing each drive? Are any axis settings being changed between tests?

I honestly think the best troubleshooting step will be to attempt to use P7000 tools to make sure that all drive settings are the same for each drive. This will also allow you to jog the motor without using the 7330 card, further eliminating a potential problem. 

Have you tried contacting Kollmorgen support about this problem?

Cheers,

Andy C.

Applications Engineering

National Instruments 

[mark514]

Hello Andy,

I always keep the same settings in MAX, just switching the wire connections from a drive to another one. Nothing seems to change in MAX when changing the drives (which I think is normal, because those are the settings of the 7330 card). 

I have not contacted Kollmorgen, I guess this will be my next move.

Thank you

[Andy-C]

Hi Mark,

Let us know what Kollmorgen suggests! I think Kollmorgen's engineers will be the best first resource for this issue, but please feel free to contact NI support as well if there is anything we need to look into on our end.

Cheers,

Andy C.

Applications Engineering

National Instruments