REXROTH Fv Series, Instruction Manual

Page: 152 / 222

Noise emission of the drive system
Causes of noise emission Controlled variable-speed drives contain converters containing snappy
semiconductors. The advantage of modifying the speed with high precision is
achieved by means of pulse width modulation of the converter voltage. This
can generate sinusoidal currents with variable amplitude and frequency in the
motor.
The steep voltage rise, the high clock rate and the resulting harmonics cause
unwanted by physically unavoidable emission of interference voltage and
interference fields (wide band interference). The interference mainly is
asymmetric interference against ground.
The propagation of this interference strongly depends on:
●
configuration of the connected drives
● number of the connected drives
● conditions of mounting
● site of installation
● radiation conditions
● wiring and installation
If the interference gets from the device to the connected lines in unfiltered
form, these lines can radiate the interference into the air (antenna effect).
This applies to power lines, too.
Limit values for line-based distur‐
bances
According to IEC EN 61800-3 or CISPR 11 (corresponds to EN 55011), the
limit values in the table below are distinguished. For this documentation both
standards are combined in the limit value classes A2.1 to B1.
IEC / EN 61800-3 CISPR 11 Explanation
In this
documentation Curves of limit
value characteristic
Category C4 2
nd
environment
None
One of the following 3 requirements
must have been fulfilled: Mains
connection current>400 A, IT mains
or required dynamic drive behavior
not reached by means of EMC
filter. Adjust limit values to use and
operation on site. User has to carry
out and provide evidence of EMC
planning.
None -
Category C3 2 nd
environment
Class A; group 2
I>100 A
limit value in industrial areas to be
complied with for applications
operated at supply mains with
nominal currents>100 A
A2.1
1.1
1.2
Category C3 2 nd
environment
Class A; group 2
I≤100 A
limit value in industrial areas to be
complied with for applications
operated at supply mains with
nominal currents≤100 A
A2.2
2.1
2.2
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Rexroth Frequency Converter Fv
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Technical Data