Hitachi WJ200 Series VFDs
Overview
Variable frequency drive (VFD) made by Hitachi. Useful for controlling 3-phase spindle motors on CNC routers. It can be controlled with discrete digital inputs, or over Modbus (RS-485). It can be configured from the keypad, or over USB using Hitachi's software which is much more convenient.
Software
There is Windows PC based software called ProDriveNext which can communicate with the VFD over it's mini-USB port:
Industrial Inverters Software Downloads | ICED : Hitachi America, Ltd. (dead link)
Industrial Inverters Software Downloads | ICED : Hitachi America, Ltd. (page works, but has outdated links on it)
ProDriveNext - Inverter Configurator - Software - Products - Hitachi Automation
The latest version was 2.6.2 at the time of this writing.
Modbus control
VFD parameters
The VFD must be configured for Modbus control of the settings of interest (usually just run/stop, forward/reverse, and electrical frequency which corresponds to speed).
| Name | Value | Default | Description |
|---|---|---|---|
| A001 | 03 (Modbus network input) | Frequency source | |
| A002 | 03 (Modbus network input) | Run command source | |
| C071 | 06 (19,200 baud) | Communication speed | |
| C072 | 1 | Modbus address | |
| C074 | 00 (no parity) | Communication parity | |
| C075 | Communication stop bits | ||
| C076 | 02 (disable) | Communication error select | |
| C077 | 2.0 | Communication watchdog timer period (seconds) | |
| C078 | Communication wait time |
Page 331 (marked B-2 in the PDF) of the instructional manual details how to wire and configure Modbus on the VFD.
Modbus coils/registers
Coils for writing (they can usually also be read):
| Coil No. (hex) | Coil No. (dec) | Values | Description |
|---|---|---|---|
| 0x0001 | 1 | 1: on, 0: off | Operation command |
| 0x0002 | 2 | 1: reverse, 0: forward | Rotation direction command |
| 0x0004 | 4 | 1: reset | Trip reset |
Coils for reading:
| Coil No. (hex) | Coil No. (dec) | Values | Description |
|---|---|---|---|
| 0x000F | 15 | 1: run, 0: stop | Operation status |
| 0x0010 | 16 | 1: reverse, 0: forward | Rotation direction |
| 0x0011 | 17 | 1: ready, 0: not ready | Inverter ready |
| 0x0013 | 19 | 1: tripping, 0: normal | "running" (tripping?) status |
Page 353 (marked B-24 in the PDF) lists the Modbus coil numbers and their functions.
"Holding" registers for writing:
| Register No. (hex) | Register No. (dec) | Values | Description |
|---|---|---|---|
| 0x0001, 0x0002 (MSB) | 1, 2 | 0 - 40000 (decimal Hz * 100) | Frequency setpoint |
Taken from Page 355 (marked B-26 in the PDF) of the instructional manual.
Registers for "monitoring" (reading):
| Register No. (hex) | Register No. (dec) | Values | Description |
|---|---|---|---|
| 0x1001, 0x1002 | 4097, 4098 (MSB) | 0 - 40000 (decimal Hz * 100) | Output frequency monitor |
| 0x1003 | 4099 | 0 - 65530 (decimal A * 10) | Output current monitor |
| 0x1004 | 4100 | 0: stopping, 1: forward, 2: reverse | Rotation direction monitoring |
| 0x1011 | 4113 | 0 - 6000 (decimal V * 10) | Output voltage monitor |
| 0x1012 | 4114 | 0 - 1000 (decimal kW * 10) | Power monitor |
Taken from Page 359 (marked B-30 in the PDF) of the instructional manual.
mbpoll
There is an open source utility that can speak Modbus over a serial port (or USB to serial) that has an RS-485 adapter attached. It's called mbpoll:
https://github.com/epsilonrt/mbpoll
mbpoll commands to interact with the VFD:
# write the output frequency as Hz * 100 (2-places fixed point in decimal) to holding register 1 ./mbpoll /dev/ttyUSB0 -b 19200 6000 -s 1 -P odd -a 1 -0 -r 1 -t 4 # to turn on, write 1 to coil 1 ./mbpoll /dev/ttyUSB0 1 -b 19200 -s 1 -P odd -a 1 -r 1 -t 0 -B # to turn off, write 0 to coil 1 ./mbpoll /dev/ttyUSB0 0 -b 19200 -s 1 -P odd -a 1 -r 1 -t 0 -B # to monitor the output frequency (displays Hz * 100) ./mbpoll /dev/ttyUSB0 -b 19200 -s 1 -P odd -a 1 -r 4098 -t 4 # to monitor the output current (displays amps * 10) ./mbpoll /dev/ttyUSB0 -b 19200 -s 1 -P odd -a 1 -r 4099 -t 4 # to monitor the rotation direction (displays 0 for stopped, 1 for forward, 2 for reverse) ./mbpoll /dev/ttyUSB0 -b 19200 -s 1 -P odd -a 1 -r 4100 -t 4 # to monitor the output voltage (displays volts * 10) ./mbpoll /dev/ttyUSB0 -b 19200 -s 1 -P odd -a 1 -r 4113 -t 4 # to monitor the output power (displays kilowatts * 10) ./mbpoll /dev/ttyUSB0 -b 19200 -s 1 -P odd -a 1 -r 4114 -t 4
Online Resources
WJ200 Series AC Variable Speed Drives and Inverters | ICED : Hitachi America, Ltd.