2-12
Grounding terminals (
G)
Be sure to ground either of the two grounding terminals for safety and noise reduction. The inverter is
designed to use with a safety grounding to avoid electric shock, fire and other disasters.
Grounding terminals should be grounded as follows:
1) Ground the inverter in compliance with the national or local electric code.
2) Use a thick grounding wire with a large surface area and keep the wiring length as short as
possible.
Inverter output terminals, U, V, W and grounding terminals (
G)
Inverter’s output terminals should be connected as follows:
1) Connect the three wires of the three-phase motor to terminals U, V, and W, aligning phases
each other.
2) Connect the secondary grounding wire to the grounding terminal ( G).
• The wiring length between the inverter and motor should not exceed 50 m, when they
are connected directly. If the wiring length exceeds 50 m, an output circuit filter (option)
should be inserted. (E.g. total power cable length is 400 m as shown in the figure
below.)
• Do not use one multicore cable to connect several inverters with motors even if some
possible combinations of inverters and motors are considered.
• Do not connect a power factor correcting capacitor or surge absorber to the inverter’s
output lines (secondary circuit).
• If the wiring length is long, the stray capacitance between the wires will increase,
resulting in an outflow of the leakage current. It will activate the overcurrent protection,
increase the leakage current, or will not assure the accuracy of the current display. In
the worst case, the inverter could be damaged.
• If more than one motor is to be connected to a single inverter, the wiring length should
be the sum of the length of the wires to the motors.
