Festo — EMCS-ST — 2021-03b
8.2 Information on EMC-compliant installation
The integrated drive EMCS-ST fulfils the following tasks:
– Guarantee of immunity to interference
– Limits the conducted interference emission
If installed correctly and if all connecting cables are wired correctly, the device fulfils the specifications
of the product standard IEC 61800-3.
The category that the device fulfils depends on the filter measures used and the cable length.
Order code Category Pulse-width modula-
tion frequency [kHz]
Max. permissible
line length [m]
EMCS-ST-... C2
(Residential area)
1)
− −
C3
(Industrial environ-
ment)
20 30 (DIO operation)
20 (IO-Link operation)
1) Application area not approved
Tab. 6: Category according to the pulse-width modulation frequency and the cable length
Laying cables
Comply with general guidelines for EMC-compliant installation, e.g.:
– Do not lay signal cables parallel to power cables.
– Comply with required minimum distances between signal cables and power cables dependent on
the installation conditions. Signal cables must be laid as far away from power cables as possible.
– Do not cross signal cables with power cables or cross them at a 90° angle.
8.3
Functional earth (FE) and protective earth (PE) connection
When connecting the functional earth (FE) and the protective earth (PE), follow the specifications of
EN 60204-1.
Functional earth (FE)
– Connect the functional earth (FE) to the following points before commissioning:
–
EMCS-ST: FE connection, pin 4 [Power]
–
PELV fixed power supply unit: FE connection of the PELV power supply unit (the PELV power
supply unit must be connected to protective earth (PE))
Protective earth (PE)
–
Connect the protective earth (PE) to one of the following locations before commissioning:
–
Drive system: profile groove or threaded hole
– Mounting surface or mounting frame: depending on application
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