Electrical Installation
‑170‑
8.4.3 Control Circuit Wiring Requirements
Note
Wire the control circuit cable according to EN 60204‑1.
Selection requirements
To ensure that the control circuit will not be interfered by peripheries, use shielded
cables with the shield for signal cables, and connect both ends of the shield to the
drive 360 degrees with the shield bracket. Use separate shielded cables for different
analog signals. It is recommended to use shielded twisted pair (STP) cables for digital
signals.
Figure 8‑51 Shielded twisted pair cable
Requirements on shield grounding for analog terminals
Weak analog voltage signals are prone to suffer external interference. Therefore, a
shielded cable is required, and the wiring distance must be as short as possible (no
longer than 20 m). In applications where severe interference exists and impacts
certain analog signals, install a filter capacitor or ferrite core at the analog signal
source.
● It is recommended to use the grounding bracket (optional) together with the
shielded cable, so that the cable shield can be grounded 360 degrees.
● Minimize the length of the lead wire of the shield. Fasten the lead wire to the
standard grounding copper busbar of the AC drive by using screws. The following
figure shows the grounding.
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