Siemens SIMOTICS A 1FU8, Operating Instructions Manual

Page: 147 / 226

Preparing for use
4.6 Electromagnetic compatibility
1FU8
Operating Instructions, 02/2016, 5 610 70000 02 000
33
4.6 Electromagnetic compatibility
Note
If the torque levels are very unequal (e.g. when a reciprocating compressor is being driven),
a non-sinusoidal machine current will be induced whose harmonics can have an
impermissible effect on the supply system and cause impermissible interference emissions
as a result.
Note
Converter
• If operated with a frequency converter, the emitted interference varies in strength,
depending on the design of the converter (type, interference suppression measures,
manufacturer).
•
Avoid that the specified limit values stipulated for the drive system (consisting of the
motor and converter) are exceeded.
• You must observe the EMC information from the manufacturer of the converter.
•
The most effective method of shielding is to conductively connect a shielded machine
supply cable to the metal terminal box of the machine (with a metal screw connection)
over a large surface area.
• On machines with integrated sensors (e.g. PTC thermistors), disturbance voltages
caused by the converter may occur on the sensor cable.
When used in accordance with their intended purpose and operated on an electrical supply
system with characteristics according to EN 50160, the enclosed machines comply with the
requirements of the EC Directive concerning electromagnetic compatibility.
Immunity to interference
The machines in principle fulfill the requirements of interference immunity in conformity with
EN / IEC 61000-6-2 . If machines with integrated sensors (e.g. PTC thermistors) are used,
the operating company must ensure sufficient interference immunity by selecting a suitable
sensor signal lead (possibly with shielding, connected in the same way as the machine
feeder cable) and a suitable evaluation unit.
When operating the machines from a converter at speeds higher than the rated speed, then
the mechanical speed limits must be carefully observed (safe operating speed
EN / IEC 60034-1).