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Polar Gateway on WEG CFW500

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

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(9) terminal and the negative wire to the DCM(12) terminal.

2. Connect RS-485.

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


Remote Control Setup

Modbus registers can be edited and monitored remotely, but to enable remote control of the variable speed drive the below registers must be set accordingly.

LOC/REM Selection SrcWhat source will determine if the device is in REM/LOC mode.  (set =1, to force drive into remote mode).P022021
REM Reference Sel.Speed / frequency reference source when in remote mode.P022209
REM Run/Stop Sel.Start/Stop Command Source when in remote mode.P022702

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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