Motorelli AD900 Variable Speed Drive

PostedFebruary 27, 2024

UpdatedFebruary 28, 2024

ByMbhoni Mashavani

This article describes the connection and setup of the Motorelli AD900 Variable Speed Drive to the Polar Monitoring Gateway.

Steps to follow:

Connect power to the Gateway.
Connect RS-485.
Final checks.
Power on the system.
Configure the Motorelli AD900 Serial Parameters.

Motorelli AD900 Connection Setup

1. Connect power to the Gateway.

A. Power the gateway from the external power supply.

Wire the Polar Gateway to a 12-24 V DC power supply. Connect the positive wire to the positive terminal and the negative wire to the negative terminal.

B. Power the gateway from the VSD.

Wire the Polar Gateway directly to the VSD. Connect the positive wire to the (+24V) terminal and the negative wire to the (COM) terminal.

2. Connect RS-485.

Wire the RS-485 cable to allow communication with the Polar Gateway. Connect A+ to 485+terminal,B- to 485- and G to PE. What is RS-485?

3. Final checks

Before switching on the Gateway and the device, make sure you have completed all the previous steps correctly.

Make sure the wiring is secure – no short circuits.
Ensure that all connections are secure on the device and the gateway.
Re-check the RS-485 twisted pair cable is correctly wired.
Check that the A and B are correctly wired to the device.

4. Power on the system

Now you are ready to go, you can now switch on the Polar Gateway and the Motorelli AD900.

5. Configure Motorelli AD900 Serial Parameters

In order for the Gateway to correctly communicate with the Motorelli AD900 controller, there will need to be some changes made to the communication parameters.

Serial Communication Setup

Name	Description	Parameter	Default	Required
Serial Address	Serial Slave ID	P14.00	1	1
Serial Baud Rate	Baud Rate	P14.01	4 = 19200	3 = 9600
Serial Bytes Config	Communication settings	P14.02	1 = 8 bits, even, 1	0 = 8 bits, no, 1
Serial Protocol	Communication protocol	P00.02	0 = Modbus RTU	0 = Modbus RTU

Remote Control Setup

Name	Description	Parameter	Default	Required
LOC/REM Selection	What source will determine if the device is in REM/LOC mode.	P00.01	0	2
REM Reference Sel.	Speed / frequency reference source when in remote mode	P01.O1	0	0
REM Run/Stop Sel.	Start/Stop Command Source when in remote mode.	P01.00	0	0

You may now sign in to the Polar Portal to monitor the device remotely, the button on the right will take you through a setup process.