I have an old installation with 3x 650 drives running on Modbus/RS485 from a Mitsubishi PLC, running AC motors (fan motors) in open loop Hz speed control mode.
Two of these drives are connected to Modbus by the previous engineer and there is no documentation.
The third drive is set to manual speed control and the RS485 cable is not connected (at the PLC end)
Question 1: Where can I find info on setting up the RS485 to be MODBUS protocol for the third 650 drive? I intend to just copy the existing drive serial comms settings and change the Modbus address, is there an easy way to do that? I presume I am better to use DSE Lite to read the settings and set up?
Question 2: What is the Modbus command to set the speed (in %) and the command to get back the Hz freq and amps being supplied (As these are to be shown on the HMI)?
Sorry if these seem very simple questions I'm new to Modbus and have not found a simple document or guide anywhere despite looking (I may be using the wrong search terms)
Many thanks in advance