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3. WIRING
3-3
3
3.2 Wiring of the Main Circuit Terminals
3.2.1 Terminals
Symbols Name Description
R, S, T
AC power input
terminals
Connect to the commercial power supply.
U, V, W
Motor connection
terminals
Connect to a dedicated variable-speed synchronous
motor.
P/+, PR
Brake resistor
connection terminals
Connect the brake resistor (option).
P/+, P1
DC reactor
connection terminals
Disconnect the jumper from terminals P/+-P1 and
connect the FR-BEL power factor improving DC
reactor (option).
P/+, N/- DC terminals Connect to the BU brake unit (option).
Ground terminals
Terminals for connection of the ground cables. (There
are two terminals.)
3.2.2 Terminal layout and connection specifications
CX522-0.4, 0.75K CX522-1.5K to 3.7K
Layout
P1
P/+
PR
R/L1S/L2T/L3
UVW
TB1
N/-
Layout
P1
P/+
PR
R/L1S/L2T/L3
UVW
TB1
TB2
N/-
Screw size
M3.5
Tightening torque
1.2N
•
m
Screw size
M4
Tightening torque
1.5N
•
m
CAUTION
Tighten the terminal screws to the specified torque. Undertightening
can cause an inter-terminal short circuit or malfunction. Overtightening
can cause the screws and unit to be damaged, resulting in a short
circuit malfunction or the like.
3.2.3 Wiring of the AC power input terminals R, S, T
Connect these terminals to the AC power supply. You need not match the phase
sequence.
RST
RST
Power supply
No-fuse breaker
CAUTION
Always apply power to only the AC power input terminals R, S, T.
Applying power to the other terminals will damage the unit.