shoelesscraig
Member
Long story short, I am building an electrical panel at work that involves roughly 20 Allen-Bradley PowerFlex 4 VFDs. All VFDs run on 480 volts. The speed reference for all of them are coming from analog output cards on a SLC, 4-20mA. Because of the VFD design, the power wires coming in and the motor wires going out are going to be passing side by side with the 4-20mA signal wires. And, because of the size and layout of the panel, 15 of these VFD's will be side by side. So, the 4-20mA wires are going to be packed into a Panduit tray that has tons and tons of high voltage wires in it. I know that it is good practice to pass power and signal wires at 90 degree angle to each other, but this time it will be impossible for me to do. The wires will have to run parallel with each other for several feet. The drives are 1 HP drives, so current will be at a minimum. And, the VFDs are for conveyor speed control, so I'm not dealing with anything incredibly demanding such as motion control.
Assuming everything is grounded correctly and the speed wires are shielded and grounded correctly, should I have any problems with noise?? I have done many an installation, but never one with this many VFDs in such a tight space.
Assuming everything is grounded correctly and the speed wires are shielded and grounded correctly, should I have any problems with noise?? I have done many an installation, but never one with this many VFDs in such a tight space.