Chapter 3 Wiring | VFD-ED
3-1 System Wiring Diagram
Figure 3-1
NOTE: For details, see the wiring diagrams in
Section 3-2.
Power input
terminal
Supply power according to the rated power
specifications indicated in the user manual (see
Chapter 8 Specifications).
NFB
or
fuse
There may be a large inrush current during
power-on. See Section 6-2 NFB to select a
suitable NFB or Section 6-3
Fuse Specification
Magnetic
contactor
Switching the power ON/OFF on the primary
side of the magnetic contactor can turn the drive
ON/OFF, but frequent switching can cause
machine failure. Do not switch ON/OFF more
than once an hour.
Do not use the magnetic contactor as the power
switch for the drive; doing so shortens the life of
AC reactor
(Input
terminal)
When the main power supply capacity is greater
than 1000 kVA, or when it switches into the
phase capacitor, the instantaneous peak voltage
and current generated may destroy the internal
circuit of the drive. It is recommended that you
install an AC reactor at input side in the drive.
This also improves the power factor and reduces
power harmonics. The wiring distance should be
within 10 m. See Section 6-4 AC/DC Reactor for
Zero phase
reactor
Used to reduce radiated interference, especially
in environments with audio devices, and reduce
input and output side interference.
The effective range is AM band to 10 MHz.
See Section 6-5 Zero Phase Reactor for details.
EMC filter
Can be used to reduce electromagnetic
interference. See Section 6-6 EMC Filter for
Brake
module
&
Brake
Used to shorten the deceleration time of the
motor. See Section 6-1
Brake Resistors and
Brake Units Used in AC Motor Drives for details.
AC reactor
(output
terminal)
The motor cable length affects the size of the
reflected wave on the motor end. It is
recommended that you install an AC output
reactor when the motor wiring length exceeds 20
meters. See Section 6-4 AC/DC Reactor for
Table 2-1
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