Electrical Installation
‑150‑
● Avoid connecting the braking resistor directly to the DC bus. Failure to comply will
result in damage to the AC drive or even fire.
U, V, and W terminals on the output side
● The specification and installation method of external main circuit cables must
comply with the local regulations and related IEC standards.
● Use copper lead cables with appropriate dimensions for main circuit cables.
● Do not connect any capacitor or surge protection device at the output side. Failure
to comply will result in frequent triggering of the protection mechanism or even
damage to the AC drive.
● An excessively long motor cable may result in electrical resonance due to the
distributed capacitance. The generated electrical resonance may cause damage to
motor insulation or high leakage current, triggering the overcurrent protection
mechanism of the AC drive. When using a motor cable longer than 100 m, install
an AC output reactor close to the AC drive.
Grounding terminal (PE)
For grounding requirements, see "
8.5.1 Grounding Requirements
"
on page 177
.
8.3.5 Main Circuit Wiring Requirements
Main circuit wiring requirements
● Terminals BR, (‑), and (+) are used to connect options. Do not connect these
terminals to an AC power supply.
● To protect the main circuit, separate and cover the surface that may come into
contact with the main circuit.
● The control circuit is the internal safety extra‑low voltage (SELV) circuit, which
must be insulated and isolated from other circuits. Make sure that the control
circuit is connected to the external SELV circuit.
● Prevent foreign matters from entering the wiring part of the terminal block.
● Do not solder the twisted conductors.
● The tightening torque may vary with terminals. Tighten terminal screws with the
specified tightening torque. You can use the torque screwdriver, ratchet, or
wrench.
● When using an electric screwdriver to tighten terminal screws, set a low speed to
prevent damage to the terminal screws.
● Tighten the terminal screws at an angle within 5 degrees. Failure to comply may
result in screw damage.
Power cable selection requirements
For the selection of power cables, follow national or regional regulations. Select IEC
cables based on the following requirements:
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