Electrical Design
‑52‑
Device Position
Description
Braking unit
All models not
containing letter
B in the
designation
Use an Inovance braking unit (MDBUN) or
recommended braking resistor for all models not
containing letter B in the designation.
Dissipates regenerative energy during motor
deceleration.
Output
reactor
Between the AC
drive output side
and the motor
(close to the AC
drive)
The output side of the AC drive generally has large
high‑order harmonics. When a motor is far away from
the AC drive, much distributed capacitance exists in the
circuit and certain harmonics may cause resonance in
the circuit, which will:
(a) Degrade motor insulation performance and damage
the motor in the long run.
(b) Generate large leakage current and trigger AC drive
protection frequently.
If the distance between the AC drive and motor is
greater than 100 m, install an AC output reactor.
dv/dt
reactor
AC drive output
side (close to the
AC drive)
Optional; protects motor insulation and reduces
bearing current.
Output
magnetic
ring
AC drive output
side (close to the
AC drive)
Reduces bearing current.
Motor
AC drive output
side
Select an applicable motor.
Note: For selection of peripheral electrical devices, see "Option Selection".
Note
● Do not install a capacitor or surge protection device (SPD) on the output side of
the AC drive. Failure to comply will result in AC drive faults or damage to the
capacitor or SPD.
● Input/Output (main circuit) of the AC drive contains harmonics, which may
interfere with communication devices near the AC drive. Install an anti‑
interference filter to minimize the interference.
3.1.2 Electrical Wiring Diagram
The following figure shows a typical wiring method.
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