Hey David,
as I tried to explain above, to support your Hitachi S1 VFD on your Onefinity Controller, you just need to create a custom ModBus VFD in the Tool Configuration Tab. You insert these settings:
| Command | Address | Value | Comment |
|---|---|---|---|
| max-freq-read | 3 | 0 | Read max operating frequency in 0.01Hz |
| freq-set | 8193 | 0 | Set frequency in 0.01Hz |
| freq-read | 12288 | 0 | Read frequency with 0.01Hz |
| fwd-write | 8192 | 1 | Run forward |
| rev-write | 8192 | 2 | Run reverse |
| stop-write | 8192 | 5 | Stop |
| status-read | 8448 | 0 | Read status |
| disconnect-write | 8192 | 5 | Stop on disconnect |
| disable |
and then you check that in your VFD, the settings match the following:
Notes
Set the following using the VFD's front panel.
Address Value Meaning Description P00.01 2 MODBUS control Run command channel P00.06 8 Frequency set by MODBUS Frequency command selection P14.00 1 Drive ID Must match #[tt bus-id] above P14.01 3 9600 BAUD rate Must match #[tt baud] above P14.02 3 No parity, 8 data bits, 2 stop bits, RTU mode Communication mode Other settings according to the Galt G200 VFD manual
and you should be done. After having wired the pin “485+” on your VFD to pin 13 on the Onefinity 25-pin I/O port and pin “485-” to pin 14 using a twisted pair cable, you should get an “OK” on the “ModBus status” field.
Explanation: Every VFD that supports ModBus communication protocol should have a chapter in its technical documentation that describes the addresses and data that it uses to receive commands from the CNC controller over the serial line or to report its condition or errors back in the other direction. In your VFD manual, you find them under “Chapter 9 Communication protocol”. Every VFD should have such a description. Unfortunately, they are not standardized. But with this documentation, you can tell the Onefinity Controller which code is used for let the spindle run, let it stop, set the speed, report the speed, etc., by entering the values found in the VFD documentation. The values in the table I gave you above are the values your VFD uses, they were just translated from hexadecimal to decimal. If you enter them the way it is described under Custom ModBus VFD, your Onefinity Controller will be able to communicate with your VFD.
This is the advantage when buying the VFD from the spindle manufacturer.
This is not necessary since it is the other way around: You don’t tell the VFD about the Onefinity, but you tell the Onefinity about the VFD. You have to tell the Onefinity Controller the ModBus addresses that the VFD uses, and this is what I provided you with the values in the table above.