Installation and Connection 2-4
2
2-3-2 Connection of Main Circuit and Grounding Terminal
Symbol Name of terminal Description
L1/R,L2/S,L3/T Main circuit power input Connects a 3-phase power supply.
L1/L,L2/N Main circuit power input Connects a 1-phase power supply.
U,V,W Inverter output Connects a 3-phase induction motor.
P1,P(+) For DC reactor Connects an optional DC reactor.
P(+),DB For external braking Connects an optional external braking resistor.
resistor
P(+),N(-) DC link circuit terminal Connected to DC link circuit.
G grounding Grounding terminal of the inverter chassis
(housing). Connect to the protective ground.
(1) Main circuit power input terminal (L1/R,
L2/S, L3/T,L1/L,L2/N)
a. Connect the main circuit power input
terminals to the power supply through a
circuit breaker for circuit (wiring)
protection or an earth leakage breaker.
There is no need to match the phase
sequence.
b. It is recommended to connect a
magnetic contactor to disconnect the
inverter from the power supply to
prevent a failure or accident from
becoming serious upon activation of the
protective function of the inverter.
c. Do not turn the main circuit power
supply on or off to start or stop the
inverter. Instead, use control circuit
terminals FWD and REV or the RUN
and STOP keys on the keypad panel. If
it is unavoidable to turn the main circuit
power supply on or off to start or stop the
inverter, limit the frequency to once an
hour or fewer, if possible.
d. Do not connect to a single-phase power
supply for 3-phase input inverter.
(2) Inverter output terminals (U, V, W)
a. Connect these terminals to a 3-phase
motor with the correct phase sequence.
If the direction of rotation does not
match the operation direction, change
arbitrary two cables among the U, V and
W phases.
b. Do not connect a phase advance
capacitor or surge absorber to the
inverter output.
c. If the wiring length between the inverter
and the motor is extremely long, the
stray capacity between cables causes a
high frequency current, possibly tripping
the inverter due to an overcurrent,
increasing the leakage current, or
deteriorating the current detection
accuracy to cause deterioration of the
performance or other phenomena. To
prevent such trouble, limit the wiring
length of the motor to 50 m for 4.0 kW or
a smaller output or to 100 m for a larger
output.
Note: When a thermal relay is installed in the
path between the inverter and the motor, or
especially in the case of a 400V system, the
thermal relay may malfunction even with a
wiring length shorter than 50 m. In such a case,
add an OFL filter or lower the Motor sound
adjustment (carrier frequency) of the inverter. ...
Function code F26 Motor sound adjustment.
Table 2-3-1 Connection of Main Circuit and Grounding Terminal
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