Bobodopalus

Controlling mx2 inverter without modbus

8 posts in this topic

Hi all ive been given a small test cabinet to play around with and test on, it has a cp1l-el plc and a mx2 inverter, ive been looking at how to control the inverter and cant seem to find a way to program it how i want.

the plc has no modbus connector so it cannot be done that way

i want to be able to set the frequency and be able to start and stop the inverter through the control pins.

let me know if this is possible, thanks

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Use standard outputs from the PLC for Start/Stop/Reverse signals to the MX2.

Use a High speed pulse train output from the PLC to the RP Pulse Input on the MX2 to control speed.

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Posted (edited)

Ok the start/stop seems easy enough, will the PLS2 or PULS function work for the pulse output? and which pin do i need to send that to on the mx2 inverter

 

Edited by Bobodopalus
chanign words

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Posted (edited)

Those instructions are typicallu used for positioing.

If you are just controlling speed use a combination of Continuous Mode [Speed Control] instructions SPED, ACC and INI.

See Section 7-2-4 in manual W516.

Pin RP = Pulse input on MX2

Edited by BITS N BYTES

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hmm i thought i had got it set up correctly this time but no luck,

so i followed your advice and connected pin 1.00 to the RP pin and set up the parameters on the mx2 as follows

a001=06 pulse train freq

a002=02 so it can be operated by run button for now

p003=00

p004=00

i don't need to earth pin L right as its only for analog inputs?

heres the small plc code i made to control the frequency, which from what i can tell works fine, i can see the pulse train light on the plc flickering accordingly

im sure im missing something simple but i cant see it

thanks for the help so far

mx2 control example.png

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Looking at the RP input in the MX2 schematic it would appear that it only accepts a Sinking input signal.

To work with a CP1L-EL it must have Sinking Transistor outputs i.e. CL1L-EM**DT-D

Providing you have a Sinking Transistor model, you have wiring correct between PLC output and MX2 and high speed output is pulsing you should be able to monitor this signal on the MX2.

 

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dang, i guess i'll have to come back to this another time then with another method of communication, thanks for the help

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