Impulse PCW-5181 user manual Appendix a Recommended Wiring Practices for IDC Controls

Appendix A - Recommended Wiring Practices

Appendix A: Recommended Wiring Practices for IDC Controls

When configuring your Impulse please follow the wiring practices listed below:

• Earth ground your machine at one point using a star configuration (shown at right). Multiple earth grounds can cause a ground loop (see Preventing Ground Loop below).

•Avoid long cable runs. The longer the cables, the lower the signal-to-noise ratio in your application.

•Use shielded motor and encoder cables along the entire cable run.

•Separate the signal wires (I/O, encoder, etc.) from the motor wires, AC power wires, and other sources of noise in your application.

•Avoid extending cables in the field via junction boxes, terminal strips, or Molex connectors. These types of connectors are typically unshielded (as is wire going into and out of the connec- tor) and are places where noise may be injected into the system.

•Connect cable shields at the control end of your machine. Connect the motor cable shield to GND, and connect the encoder shield to COM on the control.

•Do not connect the logic common (COM) of the IDC control to earth ground on your machine or to the GND terminal on the control/drive. Separating earth ground from logic common min- imizes the potential for ground loops.

•Use shielded cables inside your panel (if control is panel or cabinet-mounted) for I/O and encoder wiring.

•Use differential, line-driven encoders with shielded, twisted-pair encoder cables. Single-ended TTL encoders are susceptible to noise and should be avoided.

•For optimum noise immunity use IDC motors and encoders with IDC controls.

Preventing a Ground Loop

Insert an ungrounded adapter to break the ground loop.

Do Not

Connect

Pig-tail

Wire

Possible Ground Loop

Additional Wiring Practices When Connecting an IDC Control to a PLC

•Connect the PLC logic common and the IDC COM terminals together.

•Disconnect the jumper between Pull-Up (or P-Up) and +12 VDC on the IDC control. Connect the positive terminal of the PLC power supply to Pull-Up (or P-Up), and connect the Power Supply common to the COM terminal on the IDC control, or to the PLC logic common (these should both be at the same potential).

•IDC inputs are Sourcing, so PLC outputs connected to IDC inputs should be Sinking.

•IDC outputs are Sinking, so PLC inputs connected to IDC ouputs should be Sourcing.

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