7
Basic System Description
A motor control system will obviously include a motor and inverter, as well as a circuit
breaker or fuses for safety. If you are connecting a motor to the inverter on a test bench
just to get started, that’s all you may need for now. But a system can also have a variety of
additional components. Some can be for noise suppression, while others may enhance the
inverter’s braking performance. The figure and table below show a system with all the
optional
components you might need in your finished application.
Name
Function
Breaker /
disconnect
A molded-case circuit breaker (MCCB), ground fault
interrupter (GFI), Type E Combination Motor
Controller(Type E C.M.C) or a fused disconnect device.
NOTE: The installer must refer to the NEC and local codes
to ensure safety and compliance.
Radio noise filter
Electrical noise interference may occur on nearby
equipment such as a radio receiver. This magnetic choke
filter helps reduce radiated noise (can also be used on
output).
Radio noise filter
Electrical noise interference may occur on nearby
equipment such as a radio receiver. This magnetic choke
filter helps reduce radiated noise (can also be used on
input).
Output-side
AC Reactor
This reactor reduces the vibration in the motor caused by
the inverter’s switching waveforms, by smoothing the
waveform to approximate commercial power quality. It is
also useful to reduce harmonics when wiring from the
inverter to the motor is more than 10m in length.
From power supply
Breaker,
MCCB or
GFI
M
Thermal
switch
L1 N
T1 T2 T3
Inverter
GND
