Originally Posted by
javabugz
Does anyone actually have modbusez working with a delta VFD-M inverter (3HP)? It seems to do nothing for me. I've set Pr. 0 to 3 (RS485), Pr.1 to 3 (rs485), pr 88 to 01 (bus address), pr 89 to 1 (COM speed 9600), pr 92 to 03 (MODBUS RTU-8N2 protocol), pr. 157 to 1 (using modbus communication). On the modbus ez software, it sets to single holding register, on/off address 2000, freq address 2001, spindle on cw 0012 (according my manual), spindle on ccw 0022, spindle off 0001. I'm using a CH340T USB serial adapter( JBtek USB to RS485 Converter Adapter from Amazon). COM2/9600/8N2 on the port setting. Windows 10 recognizes the USB converter just fine.
I'm not sure where the prolem is. It could be the physical cable (I tested the two pins from the VFD and there was a DC voltage of about 4.5V between the two leads). It could be the VFD config, or modbusez itself. I've used the serial port monitor software and could not see modbusez doing anything during start up or after with the port.
Right now, I have it working fine with the traditional +10V PWM. I just hope to set the freq via modbusez and get the actual RPM back into the software. I'm not sure if modbus is suitable to be completely integrated into the safety circuit.