Manual

32 Drive for stepper motors
4 Installation SD315O
0098441113480, V2.00, 03.2011
Additional measures for EMC
improvement
An EMC-compliant design is required to meet the specified limit values.
Depending on the application, better results can be achieved with the
following measures:
Motor cables In terms of EMC, motor cables are especially critical. Use only pre-as-
sembled cables (see chapter 9 "Accessories and spare parts") or cables
that comply with the specifications and implement the EMC measures
described below.
Equipotential bonding conductors Potential differences can result in excessive currents on the cable
shields. Use equipotential bonding conductors to reduce currents on the
cable shields.
The equipotential bonding conductor must be rated for the maximum
current flowing. Practical experience has shown that the following con-
ductor cross sections can be used:
•16mm
2
(AWG 4) for equipotential bonding conductors up to a
length of 200 m
•20mm
2
(AWG 4) for equipotential bonding conductors with a length
of more than 200 m
EMC measures Objective
Additional EMC measures design, for example
mounting in an closed control cabinet with 15 dB
shielding attenuation of radiated interference
Improves the EMC limit
values.
EMC measures Objective
Do not install switching elements in motor cables. Reduces interference.
Route the motor cable at a distance of at least
20 cm from the signal cable or use shielding plates
between the motor cable and signal cable.
Reduces mutual interfer-
ence
For long lines, use equipotential bonding conduc-
tors.
Reduces current in the
cable shield.
Route the motor cable without cutting it.
1)
1) If a cable has to be cut for the installation, it has to be connected with shield con-
nections and a metal housing at the point of the cut.
Reduces emission.