Leakage Current - Danfoss VLT DriveMotor FCM 106 Design Manual

Product Overview
A system comprises
•
FCP 106, motor and screened motor cable; or
2 2
•
FCM 106
For either of these systems, the conducted emission
complies with EN 55011 Class B, and the radiated emission
complies with EN 55011 Class A, Group 1. Compliance is
achieved based on the following conditions:
•
built-in RFI filter
•
frequency converter set to nominal switching
frequency
•
maximum screened motor cable length of 0.5 m
2.5.3 Immunity Requirements
The immunity requirements for frequency converters
depend on the environment where they are installed. The
requirements for the industrial environment are higher
than the requirements for the home and office
environment. All Danfoss frequency converters comply
with the requirements for the industrial environment and
consequently comply also with the lower requirements for
home and office environment with a large safety margin.
In order to document immunity against electrical
interference from electrical phenomena, the following
immunity tests have been made in accordance with
following basic standards:
•
EN 61000-4-2 (IEC 61000-4-2): Electrostatic
discharges (ESD): Simulation of electrostatic
discharges from human beings.
•
EN 61000-4-3 (IEC 61000-4-3): Incoming electro-
magnetic field radiation, amplitude modulated
simulation of the effects of radar and radio
communication equipment as well as mobile
communications equipment.
•
EN 61000-4-4 (IEC 61000-4-4): Burst transients:
Simulation of interference brought about by
switching a contactor, relay or similar devices.
•
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.
20
®
VLT DriveMotor FCP 106 and FCM 106 Design Guide
Basic
standard
Accept-
ance
criterion
Line (no
shield)
LCP cable 2kV
Control
wires
External
24 V DC
Relay
wires
Enclosure N.A.
Table 2.7 Immunity Requirements
1) Injection on cable shield
Abbreviations:

2.6 Leakage Current

EN/IEC61800-5-1 (Power Drive System Product Standard)
requires special care when the leakage current exceeds 3.5
mA. Follow national and local codes regarding protective
earthing of equipment with a leakage current greater than
3.5 mA. Frequency converter technology implies high
frequency switching at high power. The high frequency
switching generates a leakage current in the ground
connection. A fault current in the frequency converter at
the output power terminals can contain a DC component
which can charge the filter capacitors and cause a
transient earth current. The leakage current depends on
various system configurations including RFI filtering,
screened motor cables, and frequency converter power.
Grounding must be reinforced in one of the following
ways:
•
•
MG03M102 - 08/2015
Burst IEC Surge ESD IEC
61000-4- IEC 61000-4-
4 61000-4- 2
5
B B B
4kV 2kV/2Ω N.A.
DM
4kV/12Ω
CM
2kV/2 Ω N.A.
1)
2kV 2kV/2 Ω N.A.
1)
2kV 2kV/2 Ω N.A.
1)
2kV 42kV/42 N.A.
Ω
N.A. 8 kV AD
6 kV CD
AD - air discharge
CD - contact discharge
CM - common mode
DM - difference mode
PE ground wire of at least 10 mm
area, or
2 separate PE ground wires both complying with
the dimensioning rules.
Radiated RF
electro- common
magnetic mode
field IEC voltage
61000-4- IEC
3 61000-4-
6
A A
N.A. 10V
rms
N.A. 10V
rms
N.A. 10V
rms
N.A. 10V
rms
N.A. 10V
rms
10V/m N.A.
2 cross-sectional