17
When the connection between the inverter and the motor is too long, consider the voltage drop of the
circuit. Phase-to-phase voltage drop (V) =
3 ×resistance of wire (Ω/km)×length of line (m)×current×10
-3
. And the number of carriers must be
adjusted based on the length of the line.
The length of the line between the inverter and
the motor
Less than 50m Less than 100m More than 100m
Number of carriers allowed Below 12KHz Below 10KHz Below 5KHz
Settings of Fn_43 parameter 15 12 9
(B) The wiring of the control circuit must be separated and routed away from the main circuit control
line or other high voltage or current power lines to avoid noise interference.
z To avoid error actions caused by noise interference, shield the control circuit wiring with a
twisted wire, and connect the sheilding wire to a ground terminal. See the figure below.
The wiring distance should not exceed 50 m.
(C) Ground the ground terminal of the inverter properly.
200V class: Ground to 100Ω or less, 400V class:
Ground to 10Ω or less.
z Ground wiring is based on the electrical equipment technical basis (AWG) and should be made
as short as possible.
z Do not share the ground of the inverter to other high current loads (welding machine, high
power motor). Connect the terminal to its sole ground.
z Do not make a loop when several inverters share a common ground point.
(a) Good (b) Good (c) Bad
(D) To ensure maximum safety, use proper wire gauges for the main power circuit and control circuit
according to relative regulations.
(E) After wiring, check that the wiring is correct, wires are intact, and terminal screws are secured.
Shielding wires
Protective
To ground terminal
(See instructions of filter
wiring)
Wrapped with insulating tape
Do not connect this en
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