Help with VFD....

JoseM · Jul 16, 2012

How to wire and program a VFD to operate in FWD and REV operation using RSLogix500?

jkerekes · Jul 16, 2012

Which brand?

JoseM · Jul 16, 2012

Power Flex 4

Steve Bailey · Jul 16, 2012

RSLogix500 is used to program SLC and MicroLogix PLCs, not drives.

Asuming you want to use a PLC to control the forward and reverse operation of the motor:
1. Configure the drive to get its forward and reverse commands from the signals at the terminals instead of from the HIM.
2. Wire common terminal of a pair of contact outputs from your PLC to the input common on the drive.
3. Connect one of the contact outputs to the FWD terminal.
4. Connect the other contact output to the REV terminal.
5. Write ladder logic to turn on the contact outputs connected to the FWD and REV terminals at the appropriate times.

mallorz · Jul 17, 2012

JoseM said:
How to wire and program a VFD to operate in FWD and REV operation using RSLogix500?

Majority of what you need should be available in the user manual. Check out the link below.

http://literature.rockwellautomation.com/idc/groups/literature/documents/um/22a-um001_-en-e.pdf

Lancie1 · Jul 17, 2012

Thanks, Steve. I think you did a good job in explaining this apparently difficult concept that keeps reappearing!

Asuming you want to use a PLC to control the forward and reverse operation of the motor:
1. Configure the drive to get its forward and reverse commands from the signals at the terminals instead of from the HIM.
2. Wire common terminal of a pair of contact outputs from your PLC to the input common on the drive.
3. Connect one of the contact outputs to the FWD terminal.
4. Connect the other contact output to the REV terminal.
5. Write ladder logic to turn on the contact outputs connected to the FWD and REV terminals at the appropriate times.

Santiago1 · Jul 17, 2012

Program your forward/reverse operations in your ladder and send 24VDC output to terminal 2 for forward and 3 for reverse on your PowerFlex4 drive.

Lancie1 · Jul 17, 2012

Program your forward/reverse operations in your ladder and send 24VDC output to terminal 2 for forward and 3 for reverse on your PowerFlex4 drive.

Then the drive will do nothing. That only works if Steve's "Number 1" is done FIRST.

"Performing one-half of the required steps will be just as effective as doing none at all!" - Lancie1

Helliana · Jul 17, 2012

I wish most new users would ask themselves this simple question:

"I wonder how people did this before the days of PLCs?" If people would take the time to learn how a simple relay control circuit works.....

OZEE · Jul 17, 2012

Helliana said:
I wish most new users would ask themselves this simple question:

"I wonder how people did this before the days of PLCs?" If people would take the time to learn how a simple relay control circuit works.....

WOW!! This is incredibly simple, yet brilliant! Well said!

DwSoFt · Jul 17, 2012

Helliana said:
I wish most new users would ask themselves this simple question:

"I wonder how people did this before the days of PLCs?" If people would take the time to learn how a simple relay control circuit works.....

amen
haha

Help with VFD....

JoseM

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jkerekes

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JoseM

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Steve Bailey

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mallorz

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Lancie1

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Santiago1

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Lancie1

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Helliana

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OZEE

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DwSoFt

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