21
WIRING
3.5 FR-BR-(H) Connection Example with Resistor Unit
Make up a sequence which always shuts off power in the input side by an
overheat signal of the built-in thermal relay of the resistor unit in case a built-
in transistor of the brake unit is damaged and configure a circuit which
prevents the brake resistor from abnormal overheating, leading to burnout.
The external connection diagram is shown below.
3.5.1 When connecting one inverter and one brake unit
*1 Connect the inverter terminals (P/+, N/-) and brake unit (FR-BU2) terminals so that their
terminal names match with each other. (Incorrect connection will damage the inverter and
brake unit.)
Do not remove a jumper across terminal P/+ and P1 except when connecting a DC reactor.
*2 When the power supply is 400V class, install a step-down transformer.
*3 When using the FR-BU2 with the FR-A500, A700 series inverter 7.5K or less or FR-V500
series inverter 5.5K or less, be sure to remove a jumper across terminal PR and PX.
*4 The wiring distance between the inverter, brake unit (FR-BU) and resistor unit (FR-BR)
should be within 5m. Even when the wiring is twisted, the cable length must not exceed
10m.
*5 Normal: across TH1-TH2...close, Alarm: across TH1-TH2...open
FR-BR
FR-BR
U
V
W
P/+
N/-
R/L1
S/L2
T/L3
Motor
IM
Inverter
PR
N/-
BUE
SD
P/+
P
A
B
C
FR-BU2
FR-BR
TH2
TH1
PR
Three
phase
AC
power
supply
MCCB MC
MC
OFFON
MC
T
PR
PX
*1
*5
5m or less
*4
*4
*3
*2
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