Interference And Noise Immunity; Noise Immunity - HEIDENHAIN TNC 410 M Technical Manual

4.3.4 CE mark

4.3.5 Interference and Noise Immunity

Conducted
interference
Radiated
interference

4.3.6 Noise Immunity

January 2008
Machine tool builders, system and facility installers are responsible for EMC
compliance. Systems, machines and complete drives with frequency inverters
must therefore bear the CE mark. HEIDENHAIN components all bear the CE
mark.
The fast switching processes and high coupling capacitance of variable-speed
three-phase motors with frequency inverters result in substantial interference
to ground. This interference is not only spread along the lines, but it is also
radiated and must therefore be suppressed by taking adequate measures.
Conducted interference includes both high-frequency interference from the
PWM operation (pulse-width modulation) of the inverter system and power
line disturbance due to non-sinusoidal current drain (not with HEIDENHAIN
regenerative inverter systems) from the power line, e.g. through commutation
notches in the power rectifier. This type of interference is spread mainly
through the power line. Appropriate protective measures must therefore be
taken. See "Protective Measures" on page 4 – 16.
Radiated interference is high-frequency interference spreading in the form of
electromagnetic waves. They are primarily radiated from the motor cable, but
also from the inverter housing and from the motor itself. These waves are
taken up by electric consuming devices and their connecting leads, and then
fed back into the power line as interference current. Appropriate protective
measures must therefore be taken. See "Protective Measures" on page 4 –
16.
External electromagnetic influences must not affect the functioning and
operational reliability of the inverter system. This includes conducted
interference that affects the power input, and radiated interference that may
be caused by the inverter itself (self-induced interference). Appropriate
protective measures must therefore be taken. See "Protective Measures" on
page 4 – 16.
EMC—Electromagnetic Compatibility
4 – 15