Inovance MD500 User Manual

2 System Connection
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2
2.2 MD500 Series System Composition
Table 2-1 Description of peripheral electrical devices in MD500 Series AC drive
Device Mounting Location Function Description
Breaker
Between power and AC
drive input side
MCCB: Cut off power supply when overcurrent occurs on downstream devices
Leakage breaker: Provide protection against potential leakage current during
drive running to prevent electric shock and even a re.
Fuse
Between power and 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 power 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
GB-type model of 75 kW
and below.
Use braking resistor for the GB-type model of 75 kW and below.
Dissipate regenerative energy during motor deceleration.
Braking
unit
Full series except the GB-
type model
Use braking unit MDBUN and MDBU of Inovance and recommended braking
resistor for full series except the GB-type model.
Dissipate regenerative energy during motor deceleration.
Output
reactor
Between AC drive output
side and the motor, close
to the AC drive
Output side of the AC drive generally has much higher harmonics. When the
motor is far from the AC drive, there is much distributed capacitance in the
circuit and certain harmonics may cause resonance in the circuit, which will:
(a) Degrade motor insulation performance and damage the motor in long run.
(b) Generate large leakage current and cause frequent AC drive protection
trips.
If distance between the AC drive and the motor is greater than 100 m, install
an AC output reactor.
dv/dt
reactor
AC drive output side, close
to the AC drive
Optional. Protect motor insulation and reduce bearing current.
Output
magnetic
ring
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 a 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 the
communication device connected to the AC drive. Therefore, install an anti-interference lter to
minimize interference.

Inovance MD500 Specifications

General

Brand	Inovance
Model	MD500
Category	Controller
Language	English