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

Installation Consideration
•
EN 61000-4-5 (IEC 61000-4-5): Surge transients:
Simulation of transients brought about, e.g., by
lightning that strikes near installations.
•
EN 61000-4-6 (IEC 61000-4-6): RF Common mode:
Simulation of the effect from radio-transmission
equipment joined by connection cables.
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
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

An adjustable frequency drive takes up a non-sinusoidal
current from the line power, which increases the input
current I . A non-sinusoidal current is transformed by
RMS
means of a Fourier analysis and split up into sine-wave
currents with different frequencies, i.e., different harmonic
currents I with 50 Hz as the basic frequency:
N
Harmonic currents
Hz 50 Hz
Table 7.6
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
AF-600 FP Design and Installation Guide
Electrical Surge
interference IEC 61000-4-5
IEC 61000-4-4
B B
2 kV/2 Ω DM
4 kV CM
4 kV/12 Ω CM
1)
4 kV CM 4 kV/2 Ω
1)
4 kV CM
4 kV/2 Ω
1)
4 kV CM
4 kV/2 Ω
1)
2 kV CM 2 kV/2 Ω
2 kV CM 1)
2 kV/2 Ω
1)
2 kV CM
2 kV/2 Ω
2 kV CM
1)
2 kV/2 Ω
1)
2 kV CM 2 kV/2 Ω
0.5 kV/2 Ω DM
2 kV CM
1 kV/12 Ω CM
— —
I I I
1 5 7
250 Hz 350 Hz
DET-768A
See Table 7.4.
ESD Radiated electromagnetic
IEC field
61000-4-2 IEC 61000-4-3
B A
— —
— —
— —
— —
— —
— —
— —
— —
— —
— —
8 kV AD
10 V/m
6 kV CD
percentage of rectifier load, maintain harmonic currents at
a low level to prevent an overload of the transformer and
high temperature in the cables.
Figure 7.2
RF common
mode voltage
IEC 61000-4-6
A
10 V
RMS
10 V
RMS
10 V
RMS
10 V
RMS
10 V
RMS
10 V
RMS
7 7
10 V
RMS
10 V
RMS
10 V
RMS
10 V
RMS
—
7-5