Minimizing Noise for EMC/CE Compliance

To reduce electrical noise, observe the following motor feedback and input power wiring techniques. The descriptions that follow are detailed in System Interconnection.

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 ECZ00284 (Schaffner P/N: FN2070-10-06) or equivalent.
   
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. If implementing an AC Motor Supply, install a clamp-on ferrite filter to the Motor Supply wires. Apply the clamp-on filter as close to the drive input connector as is practical. Route the Ground (PE) wire outside of the ferrite filter. [Aerotech PN ECZ02347, Fair-rite PN 0446164281]
   
3. Place a ferrite core upstream of the Aerotech ECZ00284 AC line filter(s). Loop the AC wires once through the core. Do not loop the Ground (PE) wire through the core.
   [Ferrite core: Aerotech PN ECZ02350, Fair-rite PN 2646102002]
   
4. Drive motor-phase interface cables: Add ferrite filters to the motor phase wires as close to the drive as is practical. If you are using Aerotech cables, the ferrite filters are built into the cable.
   From System Interconnection: 
   
   • -AC configuration, refer to NOTE-17 in iXA4-AC  Recommended System Connections for a Drive-Based Controller or XA4-AC Recommended System Connections for a PC-Based Controller
   • -DC configuration, refer to NOTE-15 in iXA4-DC  Recommended System Connections for a Drive-Based Controller or XA4-DC Recommended System Connections for a PC-Based Controller.
5. If additional motor phase filtering is required, you can install a motor filter module (Aerotech P/N: MFM10-1) between the drive an the motor phase interface cable. Contact Aerotech or refer to the MFM hardware manual.
   

For typical system interconnections, refer to System Interconnection.