General requirements

  • Use a shielded encoder cable. Connect the shield at both ends.
  • Max. length of the encoder cable: 100 m
  • Use the prefabricated encoder cables from SEW-EURODRIVE. Observe the following requirements if you use other encoder cables:
    • Encoder cable length ≤ 50 m
    • The cross section of each core of the encoder cable must be ≥ 0.25 mm2. The resistance load per unit length of the cores must not exceed 78 Ω/km (at 20 °C).
    • Encoder cable length > 50 m:
    • The cross section of the cores for the encoder voltage supply and GND must be ≥ 0.5 mm2. The resistance load per unit length of these cores must not exceed 39 Ω/km. The resistance load per unit length of the signal cores must not exceed 78 Ω/km (at 20 °C).
    • The encoder cable may have the following maximum capacitances per unit length:
    • Capacitance per unit length core/core: CA’ = 70 pF/m
    • Capacitance per unit length core/shield: CS’ = 120 pF/m
    • In the signal path from the encoder to the inverter, the encoder signals must not branch off to other devices.