Minimizing Noise Interference

Follow guidelines listed below when connecting a PG board to a drive:

• Minimize noise interference by using the wiring recommendations as described in the drive manual.

• Use a noise filter on the primary power supply for EXTV/EXTVGND and separate between the primary and secondary wiring by at least 200mm.

• For EXTV/EXTVGND and the instruction signals for using twisted pair (as indicated in the circuit diagram in the previous “Input and Output Circuits”), be sure to use twisted pair cables.

• Use shielded twisted pair cable for connecting the PG board to the drive. Follow the drive manual and the manufacturer’s instructions for shielding.

• Keep the wiring between the PG board and drive as short as possible (within 1.5 m) and position them to be separated from possible noise sources as much as possible.

• For the load to be used in the controller’s (Control Unit’s) I/O, whether a relay or solenoid, make sure to use one with surge suppressor. Install a diode (or such) on the Load L side where there is no surge suppressor.

• For such peripheral equipment as a conveyor, switching the rotating direction (start, forward, reverse) of an AC motor (an induction motor, a 3-phase induction motor, etc.) requires an appropriate spark suppressor between lines. The closer the suppressor is to the motor, the more effective the noise suppression.