Inovance MD500 Series - Description of Peripheral Electrical Devices

8. Peripherals and Options
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8
Description of Peripheral Electrical Devices
Device Mounting Location Function Description
Breaker Power input side MCCB: Cut off power supply when overcurrent occurs on downstream devices
Leakage breaker: Provide protection against potentially leakage current during
drive running to prevent electric shock and even a re.
Fuse AC drive input side Provide protection in case of short circuit.
Contactor Between breaker
and AC drive input
side
Switch ON/OFF the AC drive.
Do not start/stop the AC drive frequently by switching contactor ON/OFF (time
interval is at least one hour) nor use it to directly start the AC drive.
AC reactor AC drive input side Improve power factor of power input side.
Eliminate higher harmonics of the input side effectively and prevent other
devices from being damaged due to distortion of voltage waveform.
Eliminate input current unbalance due to inter-phase unbalance.
EMC lter AC drive input side Reduce external conduction and radiation interference of the AC drive.
Decrease conduction interference owing from power supply to the AC drive
and improve the anti-interference capacity of the AC drive.
DC reactor Between EMC
lter and braking
resistor
It is standard conguration for the drive of 30 kW and above and optional for
the drive of 18.5 to 22 kW.
Improve power factor of the input side.
Improve efciency and thermal stability of the AC drive.
Eliminate impact of higher harmonics of the AC drive input side and reduce
external conduction and radiation interference.
Braking
resistor
- Use braking resistor for the GB-type model of 75 kW and below.
Dissipate regenerative energy during motor deceleration.
Braking
unit
- Use braking unit MDBUN of Inovance and recommended braking resistor for
G-type model of 90 kW and above.
Dissipate regenerative energy during motor deceleration
Output
reactor
Between AC drive
output side and
the motor, close to
the AC drive
Output side of AC drive generally has much higher harmonics. When motor
is far from AC drive, there is much distributed capacitance in the circuit and
certain harmonics may cause resonance in the circuit, which will:
Degrade motor insulation performance and damage motor in long run.
Generate large leakage current and cause frequent AC drive protection trips.
If distance between 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
Protect motor insulation and reduce bearing current.
Output
magnetic
loop
AC drive output
side, close to the
AC drive
Reduce bearing current.
Motor AC drive output
side
Select an appropriate motor.
Note
● Do not install capacitor or surge suppressor on output side of AC drive. Otherwise, it may
damage the AC drive.
● Inputs/Outputs (main circuit) of the AC drive contain harmonics, which may interfere with
communication device connected to the AC drive. Therefore, install an anti-interference lter
to minimize interference.