Electrical Design Guide
‑26‑
● Observe the following requirements during wiring of the power supply and main
circuit:
—— When the main circuit terminal is a connector, remove the connector from the
servo drive before wiring.
—— Insert one cable into one cable terminal of the connector. Do not insert
multiple cables into one cable terminal.
—— When inserting cables, take enough care to prevent the cable conductor burrs
from being short circuited to the neighboring cable.
—— Insulate the connecting part of the power supply terminals to prevent electric
shock.
—— Do not connect a 220 V servo drive to a 380 V power supply directly.
—— Install safety devices such as a circuit breaker to prevent short circuit in
external circuits. Failure to comply may result in a fire.
—— Cut off the main circuit power supply and switch off the S‑ON signal after an
alarm signal is detected.
● Do not put heavy objects onto cables or pull cables with excessive force. Failure to
comply may result in cable damage, leading to an electric shock.
● Use a power supply filter to reduce the electromagnetic interference on electronic
devices surrounding the servo drive.
3.2.1.2 Power Cable Types
● The bending radius of a cable must be 10 times more than its outer diameter to
prevent the internal conductor from breaking due to long‑time bending.
● Use cables with a rated voltage above 600 VAC and rated temperature above 75°C.
Under an ambient temperature of 30℃ and normal cooling conditions, the
permissible current density of the cable cannot exceed 8 A/mm
2
when the total
current is below 50 A, or 5 A/mm
2
when the total current is above 50 A. The
permissible current density (A/mm
2
) can be adjusted based on the following
formula in case of high ambient temperature or bundled cables.
Permissible current density = 8 x Reduction coefficient of conductor current‑
carrying density x Current correction coefficient
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