Electrical Design
‑63‑
3.3.3 Circuit Wiring Requirements
Wiring of the main circuit
● Terminals BR, (‑), and (+) are used to connect optional parts. Do not connect them
to any AC power supply.
● To protect the main circuit, separate it from all surfaces that may come into
contact with it and provide covers as required.
● The control circuit is a safety extra‑low voltage (SELV) circuit, which must be
isolated from other circuits through reinforced insulation. Make sure that the
control circuit is connected to an external SELV circuit.
● Prevent foreign objects from entering the wiring area of the terminal block.
● Do not solder stranded conductors.
● Different terminals may need different tightening torque. Tighten the terminal
screws as specified. Use screwdrivers, ratchets, or wrenches as appropriate.
● When using an electric tool to tighten the terminal screws, set the tool to a low
speed to avoid damage to the terminal screws.
● Tighten the terminal screws with an angle not greater than 5°. Failure to comply
may result in damage to the terminal screws.
Power cable selection
Follow national or regional regulations when selecting power cables. Selection of IEC
cables is based on:
● EN 60204‑1 and IEC 60364‑5‑52 standards
● Copper conductors with PVC insulation
● Heat resistance: 40°C ambient temperature and 70°C cable surface temperature
(Note: When the ambient temperature exceeds 40ºC, contact Inovance.)
● Symmetrical cables with copper mesh shield
Note
If recommended cables for peripheral devices or options are not suitable for the AC drive,
contact Inovance technical service personnel.
As required by EMC standards, use shielded cables. A shielded cable has either three
or four phase conductors, as shown in the following figure. If a three‑conductor cable
is used but its shield cannot provide sufficient conductivity, add an independent PE
cable. Alternatively, use a four‑conductor cable containing a PE conductor. To
suppress radio frequency interference effectively, use coaxial copper braid as the
cable shield. To enhance the shielding efficiency and conductivity, ensure that the
braided density is greater than 90%.
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