Symmetrical motor cable

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10 Οκτ 2013 (πριν από 3 χρόνια και 10 μήνες)

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Stable networks
by minimizing circulating currents
Symmetrical motor cable
The DIN EN 50310 „Application of equipotential bonding and earthing in buildings with information technology equipment“ also
requires a low-impedance equipotential bonding system.
Introduction – The Basics
Return current path
The inductive and part of the capacitive currents coupled into the PE
and the shield of the motor cables take the equipotential bonding
system on their way between the FU and the motor. These high-fre-
quency currents (kHz) have a negative impact on the signal reference
potential of electronic components and lead to undue high currents of
shielded cables.
Capacitive coupling
A capacitive coupling takes place between the motor phases and the
PE/shield. The resulting displacement current puts a strain on the
equipotential bonding system if the impedance is insufficient.
Inductive coupling
The magnetic alternating fields of the motor currents induce currents
in the PE/shield. The circuit between the FU and motor for these cur-
rent closes via the equipotential bonding system.
Avoid bearing damage!
Renowned converter manufacturers recommend using exclusively sym-
metrical multi-strand motor cables for the connection of frequency-
controlled three-phase drives. The aim of such measure is to avoid or
minimize bearing currents that may damage the races due to spark
erosion by high-frequency current pulses.

Minimize HF shield currents!
The rising degree of automation goes along with higher requirements
in terms of speed and control precision of the drives. According to an
ABB publication (see Hardware Manual ACA 6xx frequency converters 3
to 4300 kW) the switching sequence of modern drive technology is 20
times higher than it used to be 10 years ago.
Faster pulses and the resulting higher frequencies have boosted the
influence of stray capacitance, in the feeder of a phase on PE for ex-
ample, on the development of high-frequency leakage currents. Such
capacitance-induced leakage currents flow back to the source (conver-
ter) and always take the path of lowest impedance. It has been found
that not uncommonly such high-frequency circulating currents flow
through shield bonding of bus lines or even measuring leads arranged
parallel to the PE or the earth connection, thus causing faults of the
connected periphery.
To get the above mentioned issue under control, it is necessary to use
symmetrical motor connection cables and ensure that the earthing and
equipotential bonding system is properly installed.
Shield
Potential equalisation return current path
60 % Reduction
100%
40%
100%
0,140
0,160
0,180
asymmetric motor cable
symmetric motor cable
40%
0,080
0,100
0,120
0,140
current [A]
asymmetric motor cable
symmetric motor cable
0,020
0,040
0,060
0,080
0,100
PE-
current [A]
0,000
0,020
0,040
0 5 10 15 20 25 30 35
Phase current [A]
0 5 10 15 20 25 30 35
Phase current [A]
Shield
Capacitive coupling Inductive coupling
SymFlex
®
EMC - DRIVE
Use
The motor cables of the SymFlex series have been optimized for
use in frequency-controlled drives. The low working capacitance/
inductance of the cable, enclosed by a combination of braided and
foil shield (100 % covering) provide for minimum electromagnetic
emissions to neighbouring electronic equipment circuits.
Specially recommended for:
High drive density, long cable lengths (>20m), high pulse frequen-
cies of FUs/controllers and sensitive electronic automation equip-
ment in the environs of the drives.
Application
The motor cables are suitable for permanent installation in dry,
humid and wet rooms as well as for use outdoors and flexible use
without additional mechanical stresses.
Design
Copper conductor bare. according to VDE 0295, Class 5 and IEC
60228 cl. 5, core Insulation 2 Y according to VDE 0207, core laid
up with fillers, insulating foil, aluminium foil shield, CU braid gal-
vanized (approx. 80%) PVC jacket insulation, core colours: 3 x
green/yellow, blue, brown, black
Electrical properties
• Rated voltage: 600 / 1000 V
• Test voltage: 4000 V
• Insulation resistance: > 5 GOhm/km
• Coupling resistance: max. 250 Ohm/km
• Working capacitance:
- Core/Core depending on cross section: 70 - 250 nF/km
- Core/shield depending on cross section: 110 - 410 nF/km
• Inductance
- depending on cross section: 0,25 - 0,38 mH/km
Mechanical and thermal properties
• Bending radi:
- occasionally moved: 10-20 x cable diameter
- permanently installed: 5-10 x cable diameter
• Temperature range:
- occasionally moved: +5 bis +70 °C
- permanently installed: -40 bis +70 °C
Order information
Motor cable SymFlex
®
EMC - DRIVE
Motor cable SymFlex
®
EMC - DRIVE
Motor cable SymFlex
®
EMC - DRIVE
Motor cable SymFlex
®
EMC - DRIVE
Other cross sections on request
Cross section Cu content Outside diameter Weight
mm² kg/km ca. mm ca. kg/km

3x1,5+3G0,25 88,0 10,9 209
3x2,5+3G0,5 144,0 11,9 220
3x4,0+3G0,75 224,0 13,5 320
3x6,0+3G1,0 276,0 15,0 420
Art.-Nr.
09040015
09040025
09040040
09040060
*) Labelling according to norm
2Y insulation/jacket of thermoplastic polyethylene (PE)
SL control cable
C shield of braided CU and aluminium shield foil
YK outer sheath of polyvinyl chloride (PVC), black
J cable with green and yellow core
B ethylene/propylene rubber

The motor cables of the SymFlex series have been optimized for
The motor cables of the SymFlex series have been optimized for
use in frequency-controlled drives. The low working capacitance/
inductance of the cable, enclosed by a combination of braided and
foil shield (100 % covering) provide for minimum electromagnetic
High drive density, long cable lengths (>20m), high pulse frequen-
cies of FUs/controllers and sensitive electronic automation equip-
The motor cables of the SymFlex series have been optimized for
use in frequency-controlled drives. The low working capacitance/
inductance of the cable, enclosed by a combination of braided and
foil shield (100 % covering) provide for minimum electromagnetic
High drive density, long cable lengths (>20m), high pulse frequen-
cies of FUs/controllers and sensitive electronic automation equip-
Engineering drawing
Cable cross section
SymFlex
®
EMC - DRIVE
Type: 2YSLCYK-3JB*
Measuring and diagnostic tools
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Fax: +49 34491 5818-99
E-Mail: info@indu-sol.com www.indu-sol.com
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