K&R GT600-4T132G User Manual page 242

Description of Peripheral Electrical Devices
Device Mounting Location
Breaker Power input side
Fuse AC drive input side Provide protection in case of short circuit.
Contactor Between breaker
and AC drive input
side
AC reactor AC drive input side Improve power factor of power input side.
EMC filter AC drive input side Reduce external conduction and radiation interference of the AC drive.
DC reactor Between EMC
filter and braking
resistor
Braking -
resistor
Braking -
unit
Output Between AC drive
reactor output side and the
motor, close to the
8
AC drive
dv/dt AC drive output
reactor side, close to the
AC drive
Output AC drive output
magnetic side, close to the
loop AC drive
Motor
AC drive output
side
Note
- 240 -
- 240 -
Function Description
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 fire.
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.
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.
Decrease conduction interference flowing from power supply to the AC drive
and improve the antierference capacity of the AC drive.
It is standard configuration 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 efficiency 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.
Use braking resistor for the GB-type model of 75 kW and below.
Dissipate regenerative energy during motor deceleration.
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 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.
Protect motor insulation and reduce bearing current.
Reduce bearing current.
Select an appropriate motor.
●
Do not install capacitor or surge suppressor on output side of the 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 antierference filter to
minimize interference.
8. Peripherals and Options