LEROY-SOMER
4946 - 2013.07 / a
POWERDRIVE MD2CS
30
en
InstallatIon and maIntenance
Chassis-mounted variable speed drive
GeneRal emc - HaRmonIcs - maIns InteRFeRence
4.5 - Basic precautions for installation
these should be taken into account when wiring the cabinet
and the external components. In each paragraph, they are
listed in decreasing order of effect on correct operation of the
installation.
4.5.1 - Wiring inside the cabinet
- do not run the control cables and the power cables in the
same cable ducts.
- For control cables, use shielded twisted cables.
4.5.2 - Wiring outside the cabinet
• Connect the motor earth terminal directly to that of
the drive.
It is recommended that a shielded symmetrical cable is
used: three phase conductors and three PE conductors
arranged symmetrically.
U
W
V
PE
PE
PE
shielding
a separate Pe protective conductor is mandatory if the
conductivity of the cable shielding is less than 50% of the
conductivity of the phase conductors.
- the shield must be connected at both ends: drive end and
motor end (connected round the whole circumference).
- In the second industrial environment, the shielded motor
power supply cable can be replaced by a 3-core + earth
cable placed in a fully enclosed metal conduit (metal cable
duct for example). this metal conduit must be mechanically
connected to the electrical cabinet and the structure
supporting the motor.
If the conduit consists of several pieces, these should be
interconnected by braids to ensure earth continuity. the
cables must be positioned and held in a cloverleaf formation
in the conduit.
U
W
V
PE
U
W
V
PE
emc braid
clamp
- there is no need to shield the power supply cables between
the mains supply and the drive.
- Isolate the power cables from the control cables. the power
cables must intersect the other cables at an angle of 90°.
- Isolate sensitive elements (probes, sensors, etc) from metal
structures which may be shared by the motor support.