3.3.4 - Standards
a) Low frequency harmonics
There is no standard for current harmonics
Current harmonics introduce voltage harmonics on the
mains supply. The amplitude of these harmonics
depends on the impedance of the mains supply.
The power distributor who is affected by these
phenomena in the case of high power installations
(see 3.3.2), will have his own recommendations on the
level of voltage harmonics :
b) Radio frequency interference
To prevent interference to sensitive equipment,
European standards EN 50081 and EN 50082 stipulate
the following :
- interference levels below which sensitive equipment is
not affected : the following interference immunity :
EN 50082.1 for domestic equipment,
EN 50082.2 for industrial equipment.
- the maximum levels of interference fed back to the
supply, or radiated by power cables :
EN 50081.1 for domestic equipment,
EN 50081.2 for industrial equipment.
Note on leakage currents
High frequency leakage currents occur as interference
currents on the inverter power supply.
They may reach values above the isolation controller trip
threshold.
Previous standards which set the maximum leakage
current levels for the supply of motors connected directly
3.4 - Wiring instructions
3.4.1 - Earthing (
B
B
B
B
)
The earth conductor should have as large an area as
possible. The inverter(s) should preferably be placed in a
metal cubicle, mounted on a chassis or conductive metal
frame (unpainted).
Flat braid cables should be used to connect the various
devices to the chassis.
The motor body should be connected directly to the
inverter earth terminal by a standard cross-section earth
cable.
If a shielded connection cable is used between the
inverter and the motor to prevent radiation, the shielding
must be connected at both ends (motor body and
inverter earth terminal)
If the cross-section of the shielding is insufficient, it can
be doubled by a cable running the length of the shielded
- 0.6 % on even harmonic numbers,
- 1 % on uneven harmonic numbers,
- 1.6 % on whole harmonic distortion.
This applies to the power distributor connection point,
and not to each harmonic generator.
Reduction of harmonics fed back to the mains
supply.
The impedance upstream of the rectifier must be
increased by adding mains supply chokes.
Interference immunity
FMV 2107 and FMV 2307 inverters conform to
standards EN 50082.2, these standards are based on
IEC 801.
Radio frequency emission
FMV 2107 and FMV 2307 inverters fitted with RFI
(Radio-Frequency Interference) filters (optional)
conform to standard EN 50081 which is based
essentially on standard VDE 875.
to the 50 Hz supply can no longer be observed when a
frequency inverter is used.
In the absence of any specific standard, European
manufacturers use standard EN 60950 which allows the
leakage current to rise to 5 % of the load current per
phase.
cable, outside the shielding. This cable can be
connected to the same two ends as the shielding. This
cable prevents the circulation of high currents in the
shielding.
The quality of the earth connections must be checked
periodically, as with other power connections.
3.4.2 - Wiring inside cubicles
Do not place power cables and cables carrying
signals next to one another in the same cable trough,
even if the latter are shielded (distance > 0.5m).
Do not place inverter power supply cables next to motor
cables, especially if the inverter is fitted with an RFI filter,
as this would significantly reduce the efficiency of the
filter.
19
Frequency inverters
FMV 2107
FMV 2307
Domestic environment
Industrial environment
EN 50081.1
VDE 875 N
EN 50081.2
VDE 875 G
FMV 2107 1.5M to 3.5M
Conforms with filter FN 350-8-29 or 20-29
switching frequency = 2.9 kHz
Conforms with filter FN 350-8-29 or 20-29
switching frequency = 2.9 to 11.7 kHz
FMV 2307 1.5TL to 3.5TL
Conforms with filter FN 351-8-29 or 16-29
switching frequency = 2.9 kHz
Conforms with filter FN 351-8-29 or 16-29
switching frequency = 2.9 to 11.7 kHz
FMV 2307 1.5T to 5.5T
Conforms with filter FN 350-8-29 or 16-29
switching frequency = 2.9 kHz
Conforms with filter FN 351-8-29 or 16-29
switching frequency = 2.9 to 11.7 kHz
