Mitsubishi FR-BU2-H30K - Multiple MT-BR5 Brake Units Connection; Connecting Several Brake Units to One Inverter

25
WIRING
3.6.2 When connecting several brake units to one
inverter
*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. Even when the wiring is twisted, the cable length must not exceed 10m.
*4 Normal: across TH1-TH2...open, Alarm: across TH1-TH2...close
*5 When connecting several brake units to one inverter, always connect the master/slave
operation wiring on page 26 in addition to the above connection.
*6 CN8 connector used with the MT-BU5 type brake unit is not used.
*7 When connecting several FR-BU2 to one inverter, connect P/+ of each FR-BU2 and of the
inverter and N/- respectively. Do not pass wires from terminal P/+ and N/- of the FR-BU2 to
terminals of other FR-BU2.
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 P r.30 Regenerative function selection  and "10%" 
in Pr.70 Special regeneration brake duty (refer to the inverter manual) of the inverter.
• Do not operate the MT-BU5 type brake unit and FR-BU2 in parallel. Doing so
could cause an alarm or brake unit failure. Use the FR-BU2 only when performing
parallel operation.
MT-BR5
MC
T
R/L1
Motor
IM
Inverter
Registor unit
MT-BR5
S/L2
T/L3
U
V
P/+
N/-
P
PR
P
PR
5m or less
W
Three
phase
A
C
power
supply
MCCB
TH1
TH2
TH1
TH2
MC
CR1
CR2
OFFON
MC
CR1 CR2
*2
*3
*3
*1
*1
*7
*3
*6
*4
*4
PR
N
BUE
SD
P
P
MSG
SD
MSG
SD
*5
A
B
C
PR
N
BUE
SD
P
P
MSG
SD
MSG
SD
*5
A
B
C
Brake unit
FR-BU2