Installation
Mono Power Unit BUM 62 T 25
Baumüller Nürnberg GmbH 5.99009.03
6.2 EMC information
General information on converters
New semiconductor technologies (MCTs and IGBTs) minimize the power loss in the converter by faster
switching operation. The size of the power modules is thus more and more decreased. This means that
specific requirements must be met for the operation of converters to avoid electromagnetic influences
caused by switching operations.
Interferences may be caused by:
y capacitive fault currents. This is caused by high voltage peaks and switching of bipolar transistors
and IGBTs.
y high currents and current peaks in the motor cables The interfering energy bound in magnetic fields
reaches frequencies of a few Hertz up to approx. 30 MHz. Due to the high voltage peaks, additional
electromagnetic fields occur with frequencies of up to approx. 600 MHz.
y high chopping rates and fast logic circuits (electromagnetic field / 16 MHz .. 1 GHz).
y Mains feedbacks and harmonics. These are caused by commutations and non-sinusoidal mains
loading, particularly for mains-commutated controllers (100 Hz ... 20kHz).
German EMC Law (EMVG)
This converter corresponds to EMVG §5 Section 5, Sentence 3 of EMVG (German EMC Law) dated 09
Nov.92.
"Devices, which are exclusively manufactured or stocked as vendor parts or spare parts for further
processing by industrial companies or craftsmen or by other specialists in the field of electromagnetic
compatibility do not need to comply with the protective requirements of Paragraph 4, Section 1, nor do
they need EU conformity certification and marking, assuming that the devices in question cannot be run
on their own.””
This takes into account that EMC is essentially dependent on the subassemblies of the individual
modules and components in the switch cabinet. Regarding the total costs of the machine, it is preferable
to suppress interference of an entire system rather than each of its individual components.
The information on the next pages is intended to allow the user to configure his plant according to the
latest knowledge in the field of EMC and to comply with legal regulations.
1. Supply
2. Auxiliary voltage supply
3. Power stage
4. Switch mode power supply
5. Motor
3
2
5
1
4
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