Hitachi SJ Series P1 VFDs

Overview

Variable frequency drive (VFD) series made by Hitachi. Useful for powering spindles of CNC routers.

Factory reset

To perform a factory reset of the VFD, set the following parameters in this order:

set Ub-01 to 04
set Ub-02 to 02
set Ub-05 to 01
(wait for initialization to complete)

Modbus control

VFD parameters

Name	Value	Default	Description
AA101	08: RS-485	01: Ai1 terminal	speed command source
AA111	03: RS-485	00: FW/RV terminals	operation command source
CF-01	05: 9600 baud	05: 9600 baud	RS-485 baud
CF-02	1	1	Modbus slave address
CF-03	00: no parity	00: no parity	RS-485 parity
CF-04	1	1	RS-485 stop bits
CF-05	04: deceleration stop	02: ignore	RS-485 communication error handling
CF-06	2.00 seconds	0.00 seconds	RS-485 communication timeout time
CF-07	2ms	0ms	RS-485 communication waiting time
CF-08	01:Modbus-RTU	01:Modbus-RTU	communication method

Modbus coils/registers

TODO

mbpoll

# turn on output
./mbpoll /dev/ttyUSB0 1 -b 9600 -s 1 -P none -a 1 -r 1 -t 0 -B

# turn off output
./mbpoll /dev/ttyUSB0 0 -b 9600 -s 1 -P none -a 1 -r 1 -t 0 -B

# write 60Hz output frequency as Hz * 100 (2-place fixed point in decimal)
./mbpoll /dev/ttyUSB0 6000 -b 9600 -s 1 -P none -a 1 -r 10502 -t 4:int -B