Accessories (overview)
Filters
8
535
EDS94SPP101 EN 10.2
8.10 Filters
Advantages by the use of filters:
ƒ Compliance with EMC requirements
ƒ Reduction of the current load
ƒ Positive effects on the service life of the controllers possible
– Strong reliability
– Reduction of the failure rate
ƒ Operation on 30 mA residual−current circuit breakers for device sizes 1 ... 3 (up to
24 A/11 kW) is enabled.
Mains chokes:
Inductances for damping conducted harmonic interferences which may arise from
reloading the DC bus and the switching frequency of the inverter.
RFI filters:
RFI filters are capacitive accessories for compliance with the requirements acc. to
EN 61800−3 for conducted interference emission. RFI filters can be directly connected
upstream of the power supply modules. RFI filters are also called EMC filters.
Mains filters:
Mains filters reduce the conducted interference emission into the mains for compliance
with the requirements acc. to EN 61800−3. Mains filters are a combination of mains choke
and RFI filter in one housing.
A sinusoidal filter (LC filter) in the motor cable limits the rate of rise of voltage (du/dt
< 500 V/s) and the capacitive charge/discharge currents which occur during inverter
operation. This enables considerably larger shielded motor cables and the service life of the
motor is increased.
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