I would definitely put a reactor, filter/s, or isolation transformer on
the front end of the cheap drives.
If you are not running the drive cables (the cables between the drives
and the motors) in conduit or metallic seal tite, I would use shielded
cable.
Otherwise you risk RFI issues. I've seen some horrible RFI issues
with cheap AC drives.
Some drives require reactors between the drives and the motors if the
line lengths are long.. like over 100 ft.
I've had good luck with Automation Directs line filters. And you can
run multiple AC drives off a single Automation Direct filter, but you
need to make sure you don't exceed the current ratings, etc.
Dave
On 8/15/2019 5:21 PM, Todd Zuercher wrote:
I am preparing to install a half dozen el cheapo Chinese VFDs on a machine.
Any one have any idea if I need to or should be putting input line filters on
them? No mention of anything like this in the Chinglish manual. If so how do
you choose what size? Could I use 1 big one, or will I need a separate one for
each drive?
How about rectifiers on the output lines? I'm assuming those are rated by kva.
They are 3ph 220v 3kw drives and spindle motors.
Is it possible to set the speed on all of these using a single analog command
signal (they will all need to run at the same speed anyway.)
Todd Zuercher
P. Graham Dunn Inc.<http://www.pgrahamdunn.com/index.php>
630 Henry Street
Dalton, Ohio 44618
Phone: (330)828-2105ext. 2031
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