Basic System Description - Omron 3G3MX2 User Manual

Basic System Description

2-2 Basic System Description
28
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 perfor-
mance. The figure and table below show a system with all the optional com-
ponents you might need in your finished application.
From power supply
Breaker,
MCCB or
GFI
AC reactor
(Input choke)
EMI filter
L1 L2 L3
+1
Inverter
+
RB
+
GND
T1 T2 T3
RF noise
filter choke
AC reactor
(Output choke)
Motor
Thermal
switch
Note Note that some components are required for regulatory agency compliance
(see SECTION 5 Inverter System Accessories and Appendix D CE-EMC
Installation Guidelines).
Name
Breaker / A molded-case circuit breaker (MCCB),
disconnect ground fault interrupter (GFI), or a fused
disconnect device. NOTE: The installer
must refer to the local country norms of
application to ensure safety and compli-
ance.
Input-side This is useful in reducing low frequency
harmonics distortion induced on the
AC Reactor
power supply lines and as consequence
improve the power factor. WARNING:
Some applications must use an input-
side AC Reactor to prevent inverter
damage. See Warning on next page.
EMC filter Reduces the conducted high frequency
(for CE appli- noise on the power supply wiring
cations, see between the inverter and the power dis-
Appendix D) tribution system. Connect to the inverter
primary (input) side.
DC link Reduce harmonics generated by the
DC link
choke inverter motor driving section, by
choke
smoothing the current demand of the
capacitors.
Braking Used to disipate regenerative energy
Braking
Resistor from the motor that is accumulated into
Resistor
the DC bus charging the capacitors and
increasing the voltage.
Radio noise Electrical noise interference may occur
output filter on nearby equipment such as a radio
receiver. This magnetic choke filter
helps reduce very high frequency radi-
ated noise (can also be used on input).
Output-side This reactor in its standard type (only L
inductor), prevents the high voltage
AC Reactor
ringing of PWM modulation to reach the
motor, compensating for the capacity of
the motor cables, specially with long
lengths.
For more effective (and expensive)
options, like sinus filter (targetting net-
work-like waveforms) or dV/dt filters,
please check with your dealer.
Section 2-2
Function