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If the screen is to be placed on a mounting plate for the frequency converter, the mounting plate must be made of metal,
because the screen currents have to be conveyed back to the unit. Ensure good electrical contact from the mounting plate
through the mounting screws to the frequency converter chassis.
When using unscreened cables, some emission requirements are not complied with, although the immunity requirements
are observed.
To reduce the interference level from the entire system (unit and installation), make motor and brake cables as short as
possible. Avoid placing cables with a sensitive signal level alongside mains, motor, and brake cables. Radio interference
higher than 50 MHz (airborne) is especially generated by the control electronics.
2.6.2 EMC Emission Requirements
The test results in
have been obtained using a system with a frequency converter (with the mounting plate), a
motor and screened motor cables.
Conducted emission
Radiated emission
Standards and
requirements
EN 55011
Class A Group 2
Industrial environment
Class A Group 1
Industrial environment
EN/IEC 61800-3
Category C3
Second environment
Category C2
First environment Restricted
J1
0.37–2.2 kW, 380–480 V
25 m
Yes
J2
3.0–5.5 kW, 380–480 V
25 m
Yes
J3
7.5 kW, 380–480 V
25 m
Yes
J4
11–15 kW, 380–480 V
25 m
Yes
J5
18.5–22 kW, 380–480 V
25 m
Yes
J6
30–45 kW, 380–480 V
25 m
Yes
J7
55–75 kW, 380–480 V
25 m
Yes
Table 2.11 EMC Emission Requirements
2.6.3 EMC Immunity Requirements
The immunity requirements for frequency converters depend on the environment in which 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.
To document immunity against electrical interference from electrical phenomena, the following immunity tests have been
made on a system consisting of a frequency converter (with options if relevant), a screened control cable, and a control box
with potentiometer, motor cable, and motor.
The tests were performed in accordance with the 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) Radiated immunity
: 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 caused by switching a contactor, relay
or similar devices.
•
EN 61000-4-5 (IEC 61000-4-5) Surge transients
: Simulation of transients caused e.g. by lightning that strikes near
installations.
•
EN 61000-4-6 (IEC 61000-4-6) Conducted immunity
: Simulation of the effect from radio-transmission equipment
joined by connection cables.
Product Overview
Design Guide
38
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