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interference of frequency inverters. Anti-electromagnetic interference mainly refers to the conduction immunity,
radiation immunity, surge immunity, rapid burst immunity, ESD immunity and low frequency end immunity of the
power supply.
The Company's products will be installed and used according to the following instructions, and will have good
electromagnetic performance in general industrial environment.
There are two kinds of electromagnetic interference, one is the interference of the electromagnetic noise of the
surrounding environment to the frequency inverter, and the other is the interference of the noise generated by the
frequency inverter to the surrounding equipment.
1) Treatment method for interference of peripheral electromagnetic equipment to frequency inverter: Generally,
the electromagnetic influence on frequency inverters is caused by the installation of a large number of relays,
contactors or electromagnetic brakes in the vicinity of frequency inverters. When the frequency inverter is thus
disturbed and misoperation occurs, it is recommended to install a radio noise filter at the input of the frequency
inverter.
2) Measures for dealing with interference of frequency inverter to peripheral equipment: This part of the noise is
divided into two types: one is the frequency inverter radiation interference, while the other is the frequency
inverter conduction interference. These two kinds of interference make the peripheral electrical equipment
subject to electromagnetic or electrostatic induction. Thus causing misoperation of the device According to
different interference situations, adopt different methods to solve the problem:
a. The instruments, receivers and sensors used for measurement are generally weak in signal. If they are
relatively close to the frequency inverter or in the same control cabinet, they are prone to interference and
misoperation. Therefore, they should be kept away from the interference source as far as possible. do not
arrange the signal lines in parallel with the power lines, especially do not tie them together in parallel; Shielded
wires for signal lines and power lines and good grounding; Ferrite magnetic rings are added to the output side of
the frequency changer (the selective suppression frequency is in the range of 30 - 1000 MHz) and 2 - 3 turns
are wound in the same direction. For severe cases, the radio noise output filter can be added.
b. When the interfered equipment and the frequency inverter use the same power supply, they will cause
conduction interference. If the above methods cannot eliminate interference, a radio noise filter should be
installed between the frequency inverter and the power supply.
c If the length of the motor cable exceeds 100 m, it is required to add an output filter. The rated voltage of
the frequency inverter is 380 v and the recommended products for the input radio noise filter are shown in the
following table.
Adaptive motor power ( kw )
Power supply capacity ( kVA)
Rated input current (A)
0.75
1.5
3.4
1.5
3
5
2.2
4
5.8
4.0
5.9
10.5
5.5
8.9
14.6
7.5
11
20.5
11
17
26
15
21
35
18.5
24
38.5
22
30
46.5
30
40
62
37
57
76
45
69
92
55
85
113
75
114
157
93
134
180
110
160
214
132
192
256
160
231
307
185
242
350
200
250
385
220
280
430
250
355
465
280
396
525
315
445
590
