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3-phase conveyor motor Inverter control


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#1 Lincoln

Lincoln
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  • 6 posts

Posted 06 October 2009 - 05:39 AM

Labjack support:

Just after some basic advice and direction regarding conveyor motor control.
Would it be possible to interface a Labjack to a SEW Eurodrive inverter to control a conveyor motor?
The Eurodrive Movitrac LT E (Version B) is able to convert single phase to 3-phase electrical O/P for precice motor movements and direction.
SEW have a 'plug-in' device for the inverter that is capable of network communication (obviously at a cost) but I would like to investigate LabJack interface options as well if it is possible. It appears the device may have a 20mA current loop of sorts and also interfaces via RS-485 interface logic.
I've included the inverter's PDF's which detail the specific electrical interface requirements:

http://www.sew-eurod...df/16752813.pdf
Please take note of section 5.3 (Signal terminal overview)
and 5.4 (RJ45 communicaion socket detailing the interface signals).

http://www.sew-eurod...df/16643615.pdf
Section 4.6 (Electrical interface)

The individual codes returned by the inverter would be handled via customised code connected to the Tx/Rx pins once converted to an ethernet format...

I'm not requiring detailed specifics, just some helpful advise as to the possibility of a Labjack interface to this controller.

Thanks in advance!

Kind regards,

Lincoln...

#2 LabJack Support

LabJack Support
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  • 8677 posts

Posted 06 October 2009 - 12:44 PM

It looks like the analog input can be voltage or current, so you should be able to use a DAC channel on the UE9. It mentions 0-10 volts, but you can probably program the drive react the way you want to a 0-5 volt signal. If you do need 10 volts, you can use an LJTick-DAC, or use an op-amp as mentioned in Section 2.8.1.2 of the UE9 User's Guide.

For the RS485 interface, you might be able to connect that to the UE9 but you would definitely need differential line drivers and receivers to connect from RS485 to the single-ended logic on the UE9. Check out the following, especially post #7:

https://forums.labja...?showtopic=2547

I would consider whether you really need the UE9 in between at that point. It would likely be more straightforward to get a USB to RS485 converter, or RS232 to RS485 converter, for your PC.


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