IMO iDrive - EMC: Good Wiring Practice - Motor Side

Chapter 3 Environment description and installation
3-11
3.3.4 EMC: Good wiring practice – motor side
400V iDrive
(for example)
Motor
L1(L) L2 L3(N) PE
P N T1 T2 T3 PE
L1
L2
L3
N
E/
G
roun
d
Enclosure back plate
(paint/coating free)
Brass earth studs
fixed through
back plate and
secured with
shake-proof
washers.
N
B. Both ‘PE’
terminals must
be externally
grounded (as
shown
)
.
Optional ferrite
choke, only required
if motor cable is
very long.
N
ote: For very long
cables an ACR
should be used
External earth / ground
conductor if used.
*
Local
Isolator
Earth cables
to other
equipment in
enclosure
Note: Power suppl
y
side ancillar
y
equipment
not shown in this diagram, for clarity.
Earth / ground
cables connected
through isolator
Armoured or
screened cable,
3C or 4C.
Screen
connected at all
ends as shown.
*
* NOTE
Screen / armour must
b
e connected as shown
at each end of cable
sections.
If motor connection
box is plastic, screen
must be secured to the
metal frame of the
motor.
415V 50Hz
3-phase + N
Power supply