Problem controlling a VFD through external signal

[jleonqui]

Hi everyone!


I am trying to control a VFD with an external control. I did the next:


1. I set the VFD with its pannel for controlling it with the external controls. The frequency will be controlled with an analog signal of 0 to 5 volts and a digital signal will start or stop the motor.
2. I did a program in labview to generate the signals that the VFD will receive.
3. I connected my National Instruments device (which generates the signals) to the VFD.


With all that, I was expecting to control the VFD from my computer, but when I run my program in labview nothing happen. I did measurements with a multimeter in the outputs of my National Instrument device and the signal is what I was expecting. So, I don't know what is happening and why my VFD doesn't work properly. The VFD works OK when I use the panel button controls. Maybe I am forgetting something, but I can't figure out what I am forgetting.

I would appreciate so much any help or suggestion. Thanks!

Similar Threads:

• Problem- signal generator problem? TM2
• start program on external signal
• Need Help!- Controlling motor with +/-10V analog signal
• problem with MFIN signal
• Problem controlling a Nema 42 with a gecko 212

[ger21]

What kind of VFD, and what are your VFD settings?

And what terminals on the VFD are you using?

[jleonqui]

Hi.

I am using an A131 series of theDatasheet.rar Chinese company Ai Saikang Energy Control Technology Co. As attached files, I am sending some information of the datasheet. My settings are:

Pn04 = 2 (command from port)
Pn03 = 3 (frequency from '5V')

For the terminals, please look the file page3.jpg and I am using the next terminals: for controlling the frequency I am using terminal number 3 ('5 V IN'), for controlling the start or stop of the motor I am using the terminals number 8 and 9. Also, I am using the port number 7 GND as the commond ground.

[mactec54]

Hi.

I am using an A131 series of theDatasheet.rar Chinese company Ai Saikang Energy Control Technology Co. As attached files, I am sending some information of the datasheet. My settings are:

Pn04 = 2 (command from port)
Pn03 = 3 (frequency from '5V')

For the terminals, please look the file page3.jpg and I am using the next terminals: for controlling the frequency I am using terminal number 3 ('5 V IN'), for controlling the start or stop of the motor I am using the terminals number 8 and 9. Also, I am using the port number 7 GND as the commond ground.

The VFD you have is an AskPower, so how are you switching 8 to GND and 9 to GND

You can use a jumper just to test it

[jleonqui]

The VFD you have is an AskPower, so how are you switching 8 to GND and 9 to GND

I am not switching 8 to GND and 9 to GND, do I have to do that?

[mactec54]

I am not switching 8 to GND and 9 to GND, do I have to do that?

Yes it's just a switch normally done with a relay ( Dc solid state is best ) which is turned on/off by the control software

You can use a Jumper to test it