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WEG CFW500 Variable Speed Drives

This guide will show you how to connect the Polar Monitoring Gateway to the WEG CFW500 Variable Speed Drive. It will also take you through the setup and parameters required on the WEG CFW500 to ensure communications to the Polar Gateway.

Steps to follow:

  1. Connect power to the Gateway.
  2. Connect RS-485.
  3. Final checks.
  4. Power on the system.
  5. Configure the CFW500 Serial Parameters

WEG CFW500 Connection Setup

Wiring Diagram
1. Connect power to the Gateway.
Power Polar Gateway

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.

2. Connect RS-485.
RS-485 Polar Gateway Wiring Diagram
WEG CFW500 VSD - RS-485

Wire the RS-485 cable to allow communication with the Polar Gateway. Connect A => B+ (16) and the B => A- (14).

3. Final checks
Before you switch on the Gateway and the device make sure you have done everything correctly in the previous steps.
  • Make sure the wiring is secure – no short circuits.
  • Check if the power cables are not loosely wired to the Gateway.
  • Check if the power cables are not loosely wired to the device.
  • Re-check the RS-485 twisted pair cable is correctly wired.
4. Power on the system

Now you are ready to go, you can now switch on the Polar Gateway and the CFW500.  

5. Configure CFW500 Serial Parameters
In order for the Gateway to correctly communicate with the WEG CFW500 controller, there will need to be some changes made to the communication parameters. 

Note: It is critical to change the default settings to reflect the table below.

Serial Communication Setup


Serial AddressSerial Slave IDP030811
Serial Baud RateBaud RateP03101 = 192000 = 9600
Serial Bytes ConfigCommunication settingsP03111 = 8 bits, even, 10 = 8 bits, no, 1
Serial ProtocolCommunication protocolP03122 = Modbus RTU2 = Modbus RTU


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.

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