3-7
When the connection between the inverter and the motor is too long，consider the voltage
drop of the cables. Phase-to-phase voltage drop (V) =
3 ×resistance of wire (Ω/km)×length of line (m)×current×10
-3
.
Carrier frequency must be adjusted based on the motor cable length.
Cable length
etween the inverter and
the motor
Below 150ft Below 300ft Above 300ft
Recommended
carrier frequency
Below 12KHz Below 8KHz Below 5KHz
Setting of parameter 10-03 12 8 5
(B) The control circuit wiring must be separated and routed away from the main circuit control line
or other high voltage or current power lines to avoid noise interference
● To avoid erroneous operation caused by noise interference, shield the control circuit wiring
with twisted-wires, and connect the shielded wire to a ground terminal. Refer to the figure below.
The wiring distance should not exceed 50 meters.
(C)Inverter Ground terminal must be connected to installation ground correctly and according to
the required local wiring regulations.
For 200V class ground resistance should be 100Ω or less.
For 400V class ground resistance should be 10Ω or less.
●Ground cable size must be according to the required local wiring regulations. The shorter the
better.
●Do not share the ground of the inverter with other high current loads
(Welding machine, high power motor). Connect the terminals to their own ground.
●Do not make a loop when several inverters share a common ground point.
E310 E310 E310 E310 E310 E310 E310 E310 E310
(a) Good (b) Good (c) Bad
(D) To ensure maximum safety, use correct wire size for the main power circuit and control circuit.
(According to the required local regulations)
(E) Verify that all wiring is correct, wires are intact, and terminal screws are secured.
Shielding sheath
Protective coverin
To ground terminal
Wrapped with insulating tape
Do not connect this en
Figure 3-5 Control Cable requirements
Figure 3-6 Grounding Examples
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