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
Industrial Inverters Software Downloads | ICED : Hitachi America, Ltd.
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
TODO
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.