ACS 300 User’s Manual 87
Appendix A - Product Conformity in EEA
Motor Cable A symmetrical three conductor screened cable (three phase
with consentric protective earth) is recommended, because
unscreened cables may lead to unwanted problems of elec-
trical noise emission. See Figure A-2.
Figure A-2 Recommended motor cables.
Note! To avoid disturbance, install the motor cable away
from the control cable route. Avoid long runs parallel with
control cables.
The rapid voltage changes cause capacitive current in the
motor cable. This current increases with the switching fre-
quency and motor cable length. This phenomenon can
cause substantially higher current measured by the
ACS 300 than the actual motor current, and can cause over-
current tripping. Do not exceed cable lengths of 100 m. The
capacitive current can be diminished with an output choke
coil. If the cable length exceeds 100 m, please contact your
local distributor or ABB office.
Cable Installation To suppress the RFI emission below the limits mandated by
the EMC Directive, it is important to pay attention to the fol-
lowing:
The mains, motor and brake cables must be clamped at the
entry point, see Figure A-3 and Figure A-4. There is a
clamping plate for that purpose. Make it certain that the
screens of the cables make solid contacts to both parts of
the clamp. Leave the individual unscreened wire loops
L1
L2
L3
L1
L2
L3
PE
PE
PE
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