General Aspects Of Harmonics Emission - GE AF-600 FP Series Design And Installation Manual

Installation Consideration
Voltage range: 200-240 V, 380-480 V
Basic standard
Acceptance criterion
Line
Motor
Brake
Load sharing
Control wires
Standard bus
Relay wires
Application and network
options
Keypad cable
External 24 V DC
Enclosure
7 7
AD: Air Discharge
CD: Contact Discharge
CM: Common mode
DM: Differential mode
1. Injection on cable shield.
Table 7.5 EMC Immunity Form

7.3 General Aspects of Harmonics Emission

A frequency converter takes up a non-sinusoidal current
from mains, which increases the input current I
sinusoidal current is transformed by means of a Fourier
analysis and split up into sine-wave currents with different
frequencies, i.e. different harmonic currents I
as the basic frequency:
Harmonic currents
Hz
Table 7.6 Harmonics Emission
The harmonics do not affect the power consumption
directly but increase the heat losses in the installation
(transformer, cables). Consequently, in plants with a high
percentage of rectifier load, maintain harmonic currents at
a low level to avoid overload of the transformer and high
temperature in the cables.
60
TM
AF-600 FP Design and Installation Guide
Burst Surge
IEC 61000-4-4 IEC 61000-4-5
B B
2 kV/2 Ω DM
4 kV CM
4 kV/12 Ω CM
4 kV CM 4 kV/2 Ω
4 kV CM
4 kV/2 Ω
4 kV CM
4 kV/2 Ω
2 kV CM
2 kV/2 Ω
2 kV CM
2 kV/2 Ω
2 kV CM
2 kV/2 Ω
2 kV CM
2 kV/2 Ω
2 kV CM 2 kV/2 Ω
0.5 kV/2 Ω DM
2 kV CM
1 kV/12 Ω CM
— —
. A non-
RMS
with 50 Hz
N
I I I
1 5 7
50 Hz 250 Hz 350 Hz
ESD Radiated electromagnetic
IEC
61000-4-2 IEC 61000-4-3
B
—
1)
—
1)
—
1)
—
1)
—
1)
—
1)
—
1)
—
1)
—
—
8 kV AD
6 kV CD
Illustration 7.2 Harmonics
NOTE
Some of the harmonic currents might disturb communi-
cation equipment connected to the same transformer or
cause resonance in connection with power-factor
correction batteries.
To ensure low harmonic currents, the frequency converter
is equipped with intermediate circuit coils as standard. This
normally reduces the input current I
The voltage distortion on the mains supply voltage
depends on the size of the harmonic currents multiplied
by the mains impedance for the frequency in question.
The total voltage distortion THD is calculated on the basis
of the individual voltage harmonics using this formula:
2
THD U U
% = +
5
(U % of U)
N
DET-768b
RF common
field mode voltage
IEC 61000-4-6
A A
— 10 V
RMS
10 V
—
RMS
— 10 V
RMS
— 10 V
RMS
— 10 V
RMS
— 10 V
RMS
— 10 V
RMS
— 10 V
RMS
10 V
—
RMS
— 10 V
RMS
10 V/m —
by 40%.
RMS
2 2
U
+ ... +
N
7