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 between the inverter and the motor
Below 150ft Below 300ft
Abo ve 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 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.
S310 S310 S310 S310 S310 S310 S310 S310 S310
(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
To ground terminal
Wrapped with insulating tape
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