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Electronic equipment such as computers, measuring meters, sensors and radio
equipment, when in the same cabinet with inverter, with their wiring close to the
inverter, may misoperate due to radio interference.
Solution: (1) The susceptible equipment and its signal lines should be kept away
from the inverter. Use shielded cable for the signal line. Ground the shielding
coat. Protect the signal cable with a metal pipe and keep it off the inverter
input/output cable. When crossing of the signal line and the inverter input/output
cables is inevitable, make sure it is orthogonal. (2) Mount radio noise filter or
linear noise filter (choke coil) to the input/output side of the inverter to suppress
the radio noise.
Table2-5 Noise suppression method
3.7.2 Wiring Connection and Grounding
(1) Please do not to wire motor cable (from inverter
to motor) in parallel with power cable and keep
at least 30cm from each other .
(2) Please try to arrange the motor cable through Control signal cable
metal pipe or in metal wiring groove.
(3) Please use shielded cables control signal cable, and connect the shielding coat to PE
terminal of inverter with proximal grounding to inverter.
(4) PE grounding cable should be directly connected to the earth plate.
(5) The control signal cable shouldn’t be in parallel with strong electricity cable(power
Power cable/Motor cable
Fig. 3-16 orthogonal wiring
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