Service manual

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3.7 Installation guide for anti-jamming
Main circuit of the inverter is composed of high-power semiconductor switch
gear，so some electromagnetic noise will arise during work，to reduce or stop
disturbance to environment，show you assembling method of inverter disturbance
suppressing from many aspects such as disturbance suppressing, spot wiring,
system grounding, leak current, usage of power supply filter etc. in this section to
be referred to during spot assembling.
3.7.1 Restraining to noise disturbance
Disturbance brought by the working inverter may affect nearby electronic
device，effect degree relates to surrounding electromagnetic environment of the
inverter and anti-disturbance capacity of this device.
(1) Type of disturbance noise
According to work principle of the inverter, there are mainly 3 kinds of noise
disturbance source:
1> circuit conduction disturbance；
2> space emission disturbance；
3> electromagnetic induction disturbance；
Fi
g
.3-18 t
yp
e of noise disturbance
disturbance
Emission
disturbance from
motor wire U, V, W
Emission disturbance
from power supply
wire R, S, T
Emission disturbance of
Inverter main loop switch
And switching power
supply
co
n
duc
ti
o
n
d
i
s
t
u
r
ba
n
ce
space emission disturbance
electromagnetic induction disturb
ance
Leak current
grounding loop
disturbance
Power supply wire
high-order armonic
current disturbance
Road⑦
Road③
Road②
Road①
Road④
Road⑤
Road⑥
Input wire
induction
Inverter power
p
arts induction
Output wire
induction
Road⑧