Leakage Current - Danfoss VLT DriveMotor FCP 106 Design Manual

Product Overview
•
EN 61000-4-5 (IEC 61000-4-5): Surge transients:
Simulation of transients brought about, for
2 2 example, by lightning that strikes near instal-
lations.
Basic standard
Acceptance criterion
Line (no shield)
LCP cable
Control wires
External 24 V DC
Relay wires
Enclosure
Table 2.4 Immunity Requirements
1) Injection on shield.
Abbreviations:
•
AD - air discharge
•
CD - contact discharge
•
CM - common mode
•
DM - difference mode

2.7 Leakage Current

Follow national and local codes regarding protective
earthing of equipment where leakage current exceeds
3.5 mA.
Drive technology implies high frequency switching at high
power. This generates a leakage current in the ground
connection.
The ground leakage current is made up of several contri-
butions and depends on various system configurations,
including:
•
RFI filtering.
•
Motor cable length.
•
Motor cable screening.
•
Drive power.
24
®
VLT DriveMotor FCP 106
Burst IEC 61000-4-4 Surge IEC 61000-4-5
B B
4 kV 2 kV/2 Ω DM
4 kV/12 Ω CM
2 kV
2 kV/2 Ω 1)
2 kV
2 kV/2 Ω
2 kV 2 kV/2 Ω
1)
42 kV/42 Ω
2 kV
– –
Danfoss A/S © 12/2018 All rights reserved.
•
EN 61000-4-6 (IEC 61000-4-6): RF common mode:
Simulation of the effect from radio-transmission
equipment joined by connection cables.
ESD IEC 61000-4-2
B
–
–
1) –
–
–
8 kV AD
6 kV CD
Leakage current
Illustration 2.21 Motor Cable Length and Power Size Influence
on Leakage Current. Power Size a > Power Size b
The leakage current also depends on the line distortion.
Radiated electro- RF common mode
magnetic field voltage
IEC 61000-4-3 IEC 61000-4-6
A A
– 10 V
rms
– 10 V
rms
– 10 V
rms
– 10 V
rms
– 10 V
rms
10 V/m –
a
Motor cable length
b
MG03M302