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6.7
Power Quality
Press QUALITY.
Factors That Degrade Power Quality and Symptoms
Event
Waveform
Harmonics
RMS
Voltage
swell
RMS
Voltage
dip
RMS
Voltage
interruption
IM CW500-01EN
Symptoms
The device control circuit
uses an inverter (capacitor
input full-wave rectifier) and
thyristor (phase-control)
circuits.
These circuits cause
current distortion, which
generates harmonics.
Inrush current occur when the
power line switch is turned on
causing the voltage to increase
temporarily.
Inrush current occurs when
motors and other loads are
applied causing the current to
dip.
Lightning and other electric
surges interrupt the power
supply.
Adverse Effects
Harmonic currents can
cause phase advance
capacitor and reactor
burnouts, transformer
buzz, circuit breaker
malfunction, flicker in TV
images, and noises in
audio devices.
Equipment, robots,
and other machines
may shut down,
or PCs and office
appliances may be
reset.
6-25
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