programming conveyor belt speed

[Maire]

I have a fraction mill witch is fed by a conveyor belt. I want to regulate the speed of the convoyer belt so that the power consumption of the fraction mill motor stays stable.

Both motors (from the fraction mill and the convoyer belt) are controlled with a frequency inverter. I get the output signal from the fraction mill FI over a USB cable on my laptop.

How can I write a program on LabVIEW that uses the power consumption of the fraction mill to controll the speed of the convoyer belt?

[arteitle]

Do you currently have a way to control the output frequency of the conveyor belt drive with your computer? That'd be the other hardware requirement.

[Duffy2007]

Hello Maire,

what options do you have to communicate with the frequency inverter?

what hardware is in use?

How fast do you want to control this system?

[Borjomy]

In the inverter settings, set the current limit or the torque limit (if available). This will be a simple and effective solution to the problem. Limit the current to equal the rated current. 

[Maire]

For the fraction mill I have a WEG CFW-11 frequency Inverter. I can communicate directely over a USB cable.

For the conveyor belt I have a LS iG5A frequency Inverter. There I communicate over a BUS-Powered USB Multifunction I/O Device from National Instruments.

[Liidle]

Hello Maire,

The power consumption can't be stable if the belt has an angle and the weight of the stuff on the belt is not always the same. 

Anyway, if you've already had the program to drive the motor it will be very easy to translate in the labview.

[Borjomy]

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The power consumption can't be stable if the belt has an angle and the weight of the stuff on the belt is not always the same. 

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No problems, the power can be made constant, only by changing the speed. Without a reserve of power, the tape will constantly jerk.

[Liidle]

Oh, So I made a mistake.

From my instinct, I thought the speed should remain the same.

[Maire]

I would like to use the output signal (motor power) from the WEG frequency inverter to controll the speed of the belt conveyor. How can I programm this issue in LabVIEW?

For the controll of the speed I probably need a PID or PD block. Is there any easy way to use such a block in LabVIEW?

[Borjomy]

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@Maire wrote:

I would like to use the output signal (motor power) from the WEG frequency inverter to controll the speed of the belt conveyor. How can I programm this issue in LabVIEW?

For the controll of the speed I probably need a PID or PD block. Is there any easy way to use such a block in LabVIEW?

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The inverter also controls the speed through the torque on the shaft by its own PID regulator. Do you want to add another personal regulator? What for? It is enough to set the frequency inverter settings correctly.