System Composition
‑33‑
Table 3–1 Usage of peripheral electrical components
Name Installation Position Function
Circuit breaker Input side of the
drive, and between
the power supply
and the drive
Short circuit breaker: It cuts off the power supply when overcurrent
occurs on downstream devices, so as to prevent accidents.
Earth leakage circuit breaker (ELCB): The AC drive may generate high‑
frequency leakage current during running. To prevent electric shock or
even a fire, install a proper ELCB based on actual applications.
Fuse Input side of the
drive
It protects downstream semiconductor components in case of short
circuit.
Contactor Input side of the
drive
It controls energization and de‑energization of the drive. Do not use the
contactor to power on or off the drive frequently (minimal interval of one
hour) or use the contactor to directly start the drive.
AC input reactor Input side of the
drive
It is used to eliminate the higher harmonics of the input side effectively
and improve the power factor of the input side.
EMC filter Input side of the
drive
It reduces the conduction and radiation interference generated by the AC
drive to external devices.
Simple filter Input side of the
drive
It reduces the conduction and radiation interference generated by the AC
drive to external devices.
Braking resistor Input side of the
drive
For AC drive models with the name containing letter B, the braking
resistor is optional.
The braking resistor consumes regenerative energy generated during
motor deceleration.
Braking unit Input side of the
drive
For AC drive models with the name not containing letter B, use the
braking unit MDBUN of Inovance and the recommended braking resistor.
The braking resistor consumes regenerative energy generated during
motor deceleration.
Active front end (AFE)
unit
Input side of the
drive
An AFE is an optional unit used to feed the energy generated by the
motor during braking back to the power grid. With the AFE installed, the
braking unit and braking resistor are not required, which reduces heat
emission. Inovance AFE units feature energy saving, low noise, low
harmonics pollution, and high power factor.
DC reactor Output side of the
drive
It is optional for T5 models, and standard for T6 models and above. The
DC reactor provides the following functions:
Improves the power factor on the input side.
Improves the efficiency and thermal stability of the AC drive.
Eliminates the impact of high‑order harmonics on the input side of the
AC drive and reduces external conduction and radiation interference.
Output reactor Output side of the
drive
It ensures motor insulation and prolongs the service life of the motor.
Magnetic ring and ferrite
clamp
Output side of the
drive
It reduces interferences to the outside and the bearing current.
Signal cable It improves the anti‑interference performance of signals.
Motor Output side of the
drive
Use a proper motor.
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