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Connection of stand-alone option units
WIRING
1
z Model ..... FR-V520-11K to 15K, FR-V540-7.5K to 15K
1) Connect the brake resistor across terminals P and PR.
1.3.2 Connection of the brake unit (FR-BU)
Connect the optional FR-BU brake unit as shown below to improve the braking capability during deceleration.
*1 Connect the inverter terminals (P, N) and brake unit (FR-BU (H)) terminals so that their terminal signals match with each other.
(Incorrect connection will damage the inverter.)
*2 When the power supply is 400V class, install a step-down transformer.
*3 Be sure to remove a jumper across terminal PR-PX when using the FR-BU with the inverter of 5.5K or less.
*4 The wiring distance between the inverter, brake unit (FR-BU) and resistor unit (FR-BR) should be within 5m. If twisted wires
are used, the distance should be within 10m.
CAUTION
• If the transistors in the brake unit should become faulty, the resistor can be unusually hot, causing a
fire. Therefore, install a magnetic contactor on the inverter's input side to configure a circuit so that a
current is shut off in case of fault.
• Do not remove a jumper across terminal P and P1 except when connecting a DC reactor.
Power supply terminal
block for control circuit
PR
P1
U
V
W
Dedicated brake resistor
(FR-ABR)
R1
S1
NPRST
MC
R
S
T
U
V
W
PR
PX
Motor
IM
Inverter
Remove
jumper.
PR
P
N
HA
HB
HC
THS TH2
TH1
PPR
ON
MC
OFF
MC
P
N
T *2
*3
*1
*4
Power
supply
Brake unit
FR-BU
Resistor unit
FR-BR