3.Wiring
3-9
3.5 Connections to peripheral devices
Examples of connections between the Moscon-E7 and peripheral
devices are shown in the figure below
.
Figure 3.4 Peripheral devices
Power supply
Follow the specification on power supply.
Molded-case circuit breaker or leakage current
circuit breaker
Large inrush current flows when power is supplied thus,
use appropriate breaker, which is tolerant to high
frequency.
Magnetic contactor
Installed to remote control the supply/block of the
power. Frequent start/stop of the inverter through this
device reduces durability of the inverter. Install the
surge absorber on the coil.
AC/DC reactor for power factor improvement
AC/DC reactor is required when improving the power
factor or when the inverter is connected to a large-
capacity power transformer whose capacity is 600kVA or
more. If not, invert may be damaged.
Input noise filter
Install it close to the inverter to reduce the noise from the
wire.
Input wiring
Inappropriate wiring damages the inverter. Do not
connect input power R, S, and T to output U/T1, V/T2,
and W/T3. Keep enough distance between the control
signal line and main circuit to prevent the effect of noise.
Installation area
Install in a place free from gas and dust. Maintain the
ambient temperature within the specified range.
Output noise filter
Install the output noise filter close to the inverter to
reduce the noise from output wire of the inverter.
Motor
Follow the specification when running the motor.
Grounding
Ground the inverter and motor to prevent any electric
shock.
Wiring between the inverter and motor
Keep the wire between the inverter and motor short.
If not, it may decrease the carrier frequency.
Leakage current from the cable affects the inverter and
other peripheral devices.
～
접
지
Power supply
Molded-case
circuit breaker or
leakage current
circuit breaker
Magnetic contactor
AC/DC reactor
for power factor
improvement
Input noise filter
MOSCON-E7
Ground
Output noise filter
Motor
Ground
3-10
MOSCON-E7 User’s Manual
3.6 Wiring the main circuits
3.6.1 Wiring on the input side of main circuit
3.6.1.1 Installing a molded-case circuit breaker
• Always connect the input power terminals (R/L1, S/L2 and T/L3) via
an appropriate MCCB.
• Large inrush current flows when power-up, thus, use appropriate
breaker. Use the one that is tolerant to high frequency.
• MCCB with a capacity of 1.5 to 2 times greater than the rated current
of the inverter should be used.
• When one MCCB is used for more than one device (e.g. inverter), the
sequence must be set up so that the power supply is turned off by a
fault output.
3.6.1.2 Installing a magnetic contactor (MC)
• The inverter is able to use without the magnetic contactor of power
supply side.
• In case of installing the magnetic contactor to input power supply in
order to prevent an accident occurred by the automatic restart
operation after the recovery from a power interruption, frequent
start/stop of the inverter through this device reduces durability of the
inverter.
• When the digital operator is used, unless the inverter operation mode is
set to the automatic start operation, it cannot be automatically started
after the recovery rom a power interruption.
• Install the surge absorber on the coil.
