Engineering
10/05 AWB8230-1541GB
20
Line filters
Line filters are a combination of line reactors and radio
interference filters in a single enclosure. They reduce the current
harmonics and dampen high frequency radio interference levels.
Radio interference filters only dampen high frequency radio
interference levels.
EMC compliance
The DF51 frequency inverters operate with fast electronic switches
(IGBTs). Radio interference may therefore occur on the frequency
inverter’s output, which may affect other electronic devices, such
as radio receivers and instruments, located in the direct vicinity. To
protect against this radio frequency interference (RFI), the devices
should be screened and installed as far away as possible from the
frequency inverters.
EMC Directive for PDS drive systems
(PDS = Power Drive System)
In Europe, the EMC Directive must be adhered to by law.
The EMC product standard for drive systems is IEC/EN 61800-3
and EN 61800-3 including A11 (02/2001). This standard must also
be maintained by law. The generic standards do not apply to drive
systems, although many values are the same.
EN 61800-3 does not apply to the frequency inverter itself, but to
a complete drive system including cable and motor. A drive system
can consist of more than one drive. EN 61800-3 regards drive
systems that consist of several drives as a single drive system.
Declarations of conformity relate to a “typical drive system” with
given cable length, motor and filter for a single drive. The drive
system’s manufacturer is responsible for the complete drive
system.
Interference immunity
If you use DF51 frequency inverters in European Union (EU)
countries, you must observe EMC Directive 89/336/EEC. This
includes compliance with the following conditions:
Supply voltage (mains voltage) for the frequency inverter:
• Voltage fluctuation g10 % or less
• Voltage imbalance g3% or less
• Frequency variation g4% or less
If one of the conditions listed here cannot be fulfilled, you must
install an appropriate line reactor (a section “Line reactors” in
the appendix, page 212).
Emitted interference and radio interference suppression
Used with the assigned radio interference filters, the DF51
frequency inverters meet the requirements of the EMC Product
Standard IEC/EN 61800-3 for domestic use (first environment) and
therefore also for the higher limit values of industrial environments
(second environment).
Table 1: Category of limit values in IEC/EN 61800-3
To ensure adherence to the limit values, observe the following
points:
• Reduce performance-related interference with line filters and/or
radio interference filters including line reactors.
Caution!
When line filters or radio interference filters are used, the
leakage current to earth increases. Observe this point
when residual-current circuit-breakers are used.
Figure 10: DF51 and radio interference filter in a sealed enclosure
K1: RFI filter
T1: Frequency inverter
a Screened motor cable20Proj_EMV_D.fm18956: t-figure-num-
legend: Figure 1: DV51 and RFI filter in enclosure
K1
T1
n
n
n
Uh
M
3h
a
First environment
Power supply from
the public mains,
which also supplies
households.
C1
Corresponds with
CISPR 11 Class B
C2
Corresponds with
CISPR 11 Class A
Group 1 and
Warning
Second
environment
Power supply from a
network that does
not supply
households
(industrial networks).
C2
Corresponds with
CISPR 11 Class A
Group 2 and
Warning
C4
Corresponds with
CISPR 11 Class A
Group 2 or EMC plan
To Next Page
Loading...
