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Wiring of the Power Supply and Motor
1.5 Wiring of the Power Supply and Motor
1.5.1
Description of the main circuit terminals
Symbol
R/L1, S/L2, T/L3 Power input
U, V, W
Inverter output
N/-
DC voltage common
Power factor
P/+, P1
improving DC
reactor connection
Earth (Ground)
1.5.2
Layout and wiring of the main circuit terminals
!FR-C520-0.1K, 0.2K, 0.4K, 0.75K
R/L1
S/L2
T/L3
Power supply
CAUTION
•Always connect the power supply cables to R/L1, S/L2 and T/L3. Never
connect them to U, V and W since it will damage the inverter. (The phase
sequence need not be matched.)
•Connect the motor to U, V and W. When the forward rotation switch (signal) is
turned on at this time, the motor rotates in the counterclockwise direction as
viewed from the load shaft.
1.5.3
Cables, wiring lengths, crimping terminals, etc.
The following selection example assumes the wiring length of 20m.
1) FR-C520-0.1K to 3.7K
Terminal
Applicable
Screw
Inverter Type
Size
FR-C520-
0.1K to
M3.5
0.75K
FR-C520-
M4
1.5K, 2.2K
FRC520-3.7K
M4
Terminal Name
Jumper
P1
N/-
P/+
U
V
W
IM
Motor
Tightening
Crimping
Terminals
Torque
N•m
R, S, T U, V, W R, S, T U, V, W R, S, T U, V, W R, S, T U, V, W
1.2
2-3.5
1.5
2-4
1.5
5.5-4
Description
Connect to the commercial power supply.
Connect a three-phase squirrel-cage motor.
DC voltage common terminal. Not isolated from the
power supply and inverter output.
Disconnect the jumper from terminals P-P1 and
connect the optional power factor improving DC
reactor (FR-BEL).
For earthing (grounding) the inverter chassis. Must
be earthed (grounded).
!FR-C520-1.5K, 2.2K, 3.7K
N/-
P/+
P1
Power supply
Cables
2
mm
2-3.5
2
2
2-4
2
2
5.5-4
3.5
3.5
6
Jumper
U
V
R/L1
S/L2
T/L3
IM
Motor
Insulated
Cables
AWG
14
14
2.5
14
14
2.5
12
12
4
W
PVC
2
mm
2.5
2.5
2.5
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