
7. Electrical installation
82
Festo P.BE-CMMP-AS-3A-HW-EN 0708NH
7.13
Instructions on safe and EMC-compliant installa-
tion
7.13.1
Explanations and terms
Electromagnetic compatibility (EMC) or electromagnetic interference (EMI) involves the
following requirements:
Interference
immunity
Sufficient interference immunity of an electrical system or electrical
device against external electrical, magnetic or electromagnetic
noise via lines or space.
Interference
emission
Sufficiently low interference emission of electrical, magnetic or
electromagnetic interference of an electrical system or an electrical
device on other devices in the environment via conductors and
through the air.
7.13.2
Connection instructions
The motor cable shield and the internal PE conductor of the motor cable are both con-
nected to the central PE connection of the CMMP-AS. The mains grid PE connection and the
resolver and, if present, encoder cable shields must also be connected to this star point.
This star point must be connected to the central mass of the entire switching cabinet (short
cable to mounting panel) using a cable with a large conductive area (copper strap). This
connection strap is already included at the end of the Festo motor cable.
With greater lengths, special EMC protective measures must be taken.
Warning
For reasons of safety, all PE cables must always be connected
before commissioning.
The mains PE connection is connected to the central PE connection
point of the CMMP-AS.
Make sure that the earth connections between devices and the
mounting plate are of sufficiently large dimensions to conduct
away HF interference.
7.13.3
General information on EMC
Interference emission and resistance to interference of a servo drive controller always de-
pend on the complete design of the drive, which consists of the following components:
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