Electrical Design
‑80‑
3.4.3 Control Circuit Wiring Requirements
Note
Wire the control circuit cable according to EN 60204‑1.
Selection requirements
To avoid the influence of strong external interference noise on the control circuit, it is
recommended that the shielded cable with shield be used as the signal cable. The
shield must be connected to the equipment in 360° with signal shielding brackets at
both ends of the shield. Use a separate shielded cable for each type of analog signal.
Use shielded twisted pair cables for digital signals.
Figure 3‑24 Shielded twisted pair
Requirements on shield grounding for analog terminals
Weak analog voltage signals are susceptible to external interference. Therefore, a
shielded cable is typically required, and the wiring distance should be as short as
possible (within 20 m). In scenarios where analog signals experience severe external
interference, install a filter capacitor or a ferrite core on the analog signal source.
Use shielded cables together with a shield grounding bracket (optional) to achieve all‑
round grounding of the cable shield.
Wiring requirements for encoder signal cables
The AC drive is grounded as a whole in structure. When wiring the encoder after PG
card installation, connect the encoder signal cable shield to the PE terminal of the PG
card to complete shield grounding. Wire the encoder in accordance with the following
requirements:
1. During on‑site installation and commissioning, route the encoder cable and power
cable in different cable ducts. Failure to comply may result in encoder interference.
2. It is recommended to use the shielded twisted pairs. For differential encoders, the
cable shield must be connected to the PE terminal of the AC drive according to the
differential pair wire.
3. In some scenarios with large‑scale equipment, where the AC driver is far away from
the motor (the motor cable may be as long as 10 m), the grounding impedance of
the encoder cable shield is increased due to parasitic inductance of the cable. In
this case, you can disconnect the encoder shield from the PE terminal of the driver.
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