Mitsubishi FR-BU2-H30K - Multiple GRZG Brake Units Connection

18
WIRING
3.4.2 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 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-BU2) and brake resistor should be within
5m. Even when the wiring is twisted, the cable length must not exceed 10m.
*5 When connecting several brake units to one inverter, always connect the master/slave operation
wiring on
page 19 in addition to the above connection.
*6 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.
*7 It is recommended to install an external thermal relay to prevent overheat of brake resistors.(Refer
to page 17
)
CAUTION
Do not run the BU 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.
GRZG
U
V
W
P/+
N/-
R/L1
S/L2
T/L3
Motor
IM
Inverter
GRZG type
brake registor
External
thermal
relay
RR
Three
phase
A
C
power
supply
MCCB MC
MC
OFFON
MC
*2
PR
PX
*1
*6
5m or less
*4
*4
*3
GRZG type
brake registor
External
thermal
relay
RR
*4
*1
*4
PR
N/-
BUE
SD
P/+
A
B
C
MSG
SD
MSG
SD
FR-BU2
*5
PR
N/-
BUE
SD
P/+
A
B
C
MSG
SD
MSG
SD
FR-BU2
*5
T
*7
*7