Manual

0098441113480, V2.00, 03.2011
SD315O 4 Installation
Drive for stepper motors 31
Shielded cables
Cable installation
Power supply
EMC measures Objective
Connect large surface areas of cable shields, use
cable clamps and ground straps.
Reduces emissions.
Use cable clamps to connect a large surface area of
the shields of all shielded cables to the mounting
plate at the control cabinet entry.
Reduces emissions.
Ground shields of digital signal wires at both ends
by connecting them to a large surface or via con-
ductive connector housings.
Reduces interference
affecting the signal
wires, reduces emis-
sions
Ground the shields of analog signal wires directly at
the device (signal input); insulate the shield at the
other cable end or ground it via a capacitor (for
example, 10 nF).
Reduces ground loops
due to low-frequency
interference.
Use only shielded motor cables with copper braid
and a coverage of at least 85%, ground a large sur-
face area of the shield at both ends.
Diverts interference cur-
rents in a controlled way,
reduces emissions.
EMC measures Objective
Do not route fieldbus cables and signal wires in a
single cable duct together with lines with DC and AC
voltages of more than 60 V. (Fieldbus cables, signal
lines and analog lines may be in the same cable
duct)
Recommendation: Use separate cable ducts at
least 20 cm apart.
Reduces mutual interfer-
ence
Keep cables as short as possible. Do not install
unnecessary cable loops, use short cables from the
central grounding point in the control cabinet to the
external ground connection.
Reduces capacitive and
inductive interference.
Use equipotential bonding conductors in the follow-
ing cases: wide-area installations, different voltage
supplies and installation across several buildings.
Reduces current in the
cable shield, reduces
emissions.
Use equipotential bonding conductors with fine
wires
Diverts high-frequency
interference currents.
If motor and machine are not conductively con-
nected, for example by an insulated flange or a con-
nection without surface contact, you must ground
the motor with a ground strap or a ground wire. The
conductor cross section must be at least 10 mm
2
(AWG 6).
Reduces emissions,
increases immunity.
Use twisted pair for the DC supply. Reduces interference
affecting the signal
cables, reduces emis-
sions.
EMC measures Objective
Surge arrester if there is a risk of overvoltage. Reduces the risk of
damage caused by over-
voltage.