Basic System Description - Hitachi WJ200 Series Quick Reference Manual
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Also See for WJ200 Series:
- Instruction manual (421 pages) ,
- Quick reference manual (131 pages) ,
- Installation manual (20 pages)
Table of Contents
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.
Breaker,
MCCB or
GFI
L1 L2 L3
+1
Inverter
+
GND
T1 T2 T3
From power supply
Name
Breaker /
A molded-case circuit breaker (MCCB), ground fault
disconnect
interrupter (GFI), or a fused disconnect device. NOTE: The
installer must refer to the NEC and local codes to ensure
safety and compliance.
Input-side
This is useful in suppressing harmonics induced on the
AC Reactor
power supply lines and for improving the power factor.
WARNING: Some applications must use an input-side AC
Reactor to prevent inverter damage. See Warning on next
page.
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).
EMC filter (for
Reduces the conducted noise on the power supply wiring
CE applications,
between the inverter and the power distribution system.
see Appendix D)
Connect to the inverter primary (input) side.
Radio noise filter
This capacitive filter reduces radiated noise from the main
(use in non-CE
power wires in the inverter input side.
applications)
DC link choke
Suppress harmonics generated by the inverter. However, it
will not protect the input diode bridge rectifier.
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
This reactor reduces the vibration in the motor caused by
AC Reactor
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.
LCR filter
Sine wave shaping filter for output side.
Motor
Thermal
switch
9
Function
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