Acorn Hitachi WJ200 VFD setup

[carlpetitt]

Gotcha, thanks again. And by the way, I've watched and re-watched all of your videos on the Centroid website. Couldn't have gotten this far without them!

Carl

[martyscncgarage]

Glad they help. I think it might be time to update some of them. Only a couple years old and many are outdated now, but like Keith's Mill Training videos, there are still bits of good information in them.

[carlpetitt]

Hi Marty,

Just one thing I am still confused about, even after pouring over the VFD manual chapter 4. My confusion is regarding the common connections for FOR, REV, and RESET. You mentioned its ok to keep the VFD in sourcing mode, and my VFD (see attached picture) came out of the box with P24 direct-wired to PLC. Do I just need to setup some terminal blocks so that FOR (1), REV (2), and RESET (5) can share the P24 connection? Also, I am still not clear (even after reading the manual) if I want to keep P24 and PLC connected or not.

For clarification, the wires connected to L and 3 in my pic are for the thermal protection signal (NC) coming from the spindle.

Thanks
Carl

[carlpetitt]

So I've taken a crack at what the correct wiring should be. Any feedback on whether this looks right would be most helpful and appreciated!!

First, change to "Sourcing" – so move the short bar from P24  PLC to instead be PLC  L (“sourcing inputs, external supply”, section 4-14 p. 217)

Acorn AN OUT (0 – 10 VDC)  wires to  "O" on lower row of Wj200 inputs
Acorn AN GND (0 – 10 VDC Common)  wires to  "H" on lower row of Wj200 inputs

Acorn Spin FW (relay 4)  wires to  Hitachi input 1 (for +VDC) and L (using terminal block)

Acorn Spin REV (relay 5)  wires to  Hitachi input 2 (for +VDC) and L (using terminal block)

Acorn VFD Reset (relay 6)  wires to  Hitachi input 5 (for +VDC) and L (using terminal block)

Hitachi AL2  maps to  any available input on Acorn
Hitachi AL0  maps to  Acorn’s common

[martyscncgarage]

The jumper needs to remain, default setup is SOURCE its in the diagram:

As a test BEFORE connecting to Acorn, connect your VFD to Power, connect your VFD to the spindle motor.
Make sure you have programmed the VFD to accept its commands via the input terminals.

Put a Jumper from P24 to terminal 1 (Forward)
Put a simple battery or variable bench DC power supply, -negative to L and +positive to O. As soon as you make the last connection, the motor should spin.

Work all this out before connecting to Acorn and its RELAY board.

Marty

[martyscncgarage]

Hi Marty,

Just one thing I am still confused about, even after pouring over the VFD manual chapter 4. My confusion is regarding the common connections for FOR, REV, and RESET. You mentioned its ok to keep the VFD in sourcing mode, and my VFD (see attached picture) came out of the box with P24 direct-wired to PLC. Do I just need to setup some terminal blocks so that FOR (1), REV (2), and RESET (5) can share the P24 connection? Also, I am still not clear (even after reading the manual) if I want to keep P24 and PLC connected or not.

For clarification, the wires connected to L and 3 in my pic are for the thermal protection signal (NC) coming from the spindle.

Thanks
Carl

Well see, this is why we need pictures!
So your drive is set to SINK, that's fine, it doesn't matter which method you choose. Just make sure you are using the Relay board that came with Acorn and DO the bench test FIRST before connecting to Acorn.

Use the "L" on the lower row for your common for the digital inputs.
(Why do you have a wire on terminal 3 of the VFD?)

[carlpetitt]

Thanks Marty! So I've already done a complete bench test with the VFD and spindle and it's currently set to receive inputs from the VFD keypad, so i will change that setting before doing an Acorn - to - VFD test. I did read the manual which says that in the US the default setting is Sourcing so I was confused that mine came wired differently. So you are confirming that yes, mine is indeed set to "sinking". But now I'm confused again because you're saying it doesn't matter whether it's set to sinking or sourcing. Yes I'm using the relay board that came with the Acorn, but my read of chapter 4 I concluded that the VFD had to be set to Sourcing because the Acorn relay board is providing external voltage / current from the relay board into the VFD and if i left it as Sinking, the VFD wouldn't understand.

The wire on terminal 3 (and on L) in the pic - those wires are the wires coming from the spindle that indicate if there is an overheat situation with the spindle that should trip the VFD if the NC circuit is opened. I did program the VFD to know that terminal 3's input is a NC fault.

Anyway, did my crack at the wiring make sense?

thanks

[martyscncgarage]

It doesn't matter sinking or sourcing. Only that you connect the correct wire to the Common to the corresponding input. Acorn's relay board is dry contacts.

My bench test I suggested you to do BEFORE connecting to Acorn is ensuring the VFD is programmed correctly to recieve signals from the digital inputs and that you have indeed have the wiring correct to activate those digital inputs. Using a battery or a 0-10VDC bench power supply to the VFD inputs simulates the 0-10VDC signals that Acorn will PROVIDE to the drive to vary its output.

As for wiring and which relays you use, its up to you. I tend to follow the Centroid schematics most of the time. You are ultimately responsible for wiring the drive correctly and testing it.

Marty

[ArtG]

Carlpetitt and AshG, I am curious how you ended up wiring you Hitachi WJ200 to Acorn and what were the results?