Minimizing Noise for EMC/CE Compliance

To reduce electrical noise, observe the following motor feedback and input power wiring techniques.

1. Use shielded cable for motor and feedback connectors. Connect the shield to the backshell.
   
2. Separate motor and power wiring from encoder and I/O wiring.
   
3. Mount drives, power supplies, and filter components on a conductive panel. Mount line filters close to the drive to keep the wire length between the drive and filter to a minimum. Use a line filter, such as Aerotech’s UFM-ST, on the Motor Supply and Control Supply AC inputs.
   
4. Use the lowest motor voltage required by the application to reduce radiated emission.
   
5. Use an isolation transformer with grounded secondary to keep the effects of high frequency PWM amplifier currents to a minimum.
6. Use a separate wire for each ground connection to the drive. Use the shortest possible wire length.
   

The following additional changes could be required for EMC compliance and are recommended during initial EMC system evaluation.

1. Add a clamp-on ferrite to the feedback cable close to the drive.
   [Aerotech PN ECZ02348, Fair-rite PN 0446167281]
   
2. Add a clamp-on ferrite to the Motor Supply and Control Supply wires, including the ground wire, close to the drive.
   [Aerotech PN ECZ02347, Fair-rite PN 0446164281]
   
3. Add a ferrite core to the UFM-ST AC input wires. Wrap the AC wires and ground wire around the core one time.
   [Ferrite core: Aerotech PN ECZ02350, Fair-rite PN 2646102002]
   
4. Add a ferrite core to the motor phase and ground wires close to the drive. Wrap all four wires around the ferrite core once. Remove ferrite beads from Aerotech supplied cables if installed.
   [Ferrite core: Aerotech PN ECZ02349, Fair-rite PN 2646626402]
5. Install a motor filter module MFM10-1 close to the drive. The ferrite core that you added to the motor phase and ground wires should be located between the drive and the MFM10-1.
   

For typical system interconnections, refer to System Interconnection.