Analog output from PowerFlex drive

[giselle]

I would like to use the analog output (0-10Vdc) from an AB PowerFlex variable frequency drive, which is already connected to a PLC, to syncronize two pieces of equipment. I would like the speed of the downstream equipment to be controlled by the upstream equipment.

I am not sure what the maximum load specifications on the analog output card is but I suspect that I would need some sort of buffer or multiplexer or some other device to protect both the drive and the PLC from external faults on the interconnecting device and to give a high impedance so that the output board is not loaded.

Any suggestions?

 

[jraef]

You can use a signal converter / isolator, such as this;

Signal converter / isolator link, click here

I would suggest the 3 way isolation in a VFD application.

 

[blacksea]

Don't worry - analog output module has enough protection level for direct connection. Twisted pairs can be suggested for noise reduction.

 

[DickDV]

As far as I know, the PF4's do not have any analog output capability.

Better check your particular module to be sure its there.