Mitsubishi FR-BU2-H30K - MT-BR5 Resistor Unit Connection Examples; Single Inverter and Brake Unit Connection

24
WIRING
3.6 Connection Example with MT-BR5 Type 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 abnormal overheat of the brake resistor leading to burnout. The
external connection diagram is shown below.
3.6.1 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 The wiring distance between the inverter, brake unit (FR-BU2) and resistor unit (MT-BR5)
should be within 5m. If twisted wires are used, the distance should be within 10m.
*4 Normal: across TH1-TH2...open, Alarm: across TH1-TH2...close
*5 CN8 connector used with the MT-BU5 type brake unit is not used.
CAUTION
When replacing from the exisiting MT-BU5 type brake unit, set "2" in Pr.0 Brake
mode switchover (refer to page 33)
 , "1" in Pr.30 Regenerative function selection  and
"10%"
 in Pr.70 Special regeneration brake duty (refer to the inverter manual) of the
inverter.
MT-BR5
MT-BR5
MC
R/L1
Motor
IM
Inverter
S/L2
T/L3
U
V
P/+
N/-
P
PR
5m
or less
W
Three
phase
A
C
power
supply
MCCB
TH1
TH2
MC
CR1
OFFON
MC
CR1
T
*3
*1
*3
*5
*4
P
N
BUE
SD
P
PR
Brake unit
FR-BU2
Registor unit
MT-BR5
*2