Connection Of The Brake Unit (Fr-Bu) - Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual

 Connection example with the FR-BR-(H) resistor unit
Three phase AC
power supply
*1 When wiring, make sure to match the terminal symbols (P/+, N/-) on the inverter and on the brake unit (FR-BU2). (Incorrect connection will
damage the inverter and brake unit.)
*2 When the power supply is 400 V class, install a stepdown transformer.
*3 Be sure to remove the jumper across terminals PR and PX when using the FR-BU2 with the inverter of FR-A820-00490(7.5K) or lower, or FR-
A840-00250(7.5K) or lower.
*4 The wiring distance between the inverter, brake unit (FR-BU2) and resistor unit (FR-BR) must be within 5 m. Even when the cable is twisted, the
wiring length must be within 10 m.
*5 The contact between TH1 and TH2 is closed in the normal status and is open at a fault.
NOTE
• Do not remove the jumper across terminals P/+ and P1 except when connecting a DC reactor (FR-HEL).
 Connection example with the MT-BR5 type resistor unit
After making sure that the wiring is correct and secure, set Pr.30 Regenerative function selection = "1" and Pr.70 Special
regenerative brake duty = "0 (initial value)". Set Pr.0 Brake mode selection = "2" in the brake unit FR-BU2.
Three phase
AC power
supply
*1 When wiring, make sure to match the terminal symbols (P/+, N/-) on the inverter and on the brake unit (FR-BU2). (Incorrect connection will
damage the inverter and brake unit.)
*2 When the power supply is 400 V class, install a stepdown transformer.
*3 The wiring distance between the inverter, brake unit (FR-BU2) and resistor unit (FR-BR) must be within 5 m. Even when the cable is twisted, the
wiring length must be within 10 m.
*4 The contact between TH1 and TH2 is open in the normal status and is closed at a fault.
*5 The CN8 connector used with the MT-BU5 type brake unit is not used.
NOTE
• The warning "oL" of the stall prevention (overvoltage) does not occur while Pr.30 Regenerative function selection = "1" and
Pr.70 Special regenerative brake duty = 0% (initial value). (Refer to

2.10.3 Connection of the brake unit (FR-BU)

Connect the brake unit (FR-BU(H)) as follows to improve the braking capability during deceleration.
T
MCCB
MC
R/L1
S/L2
T/L3
Inverter
PR
∗3
PX
T ∗2
MCCB
MC
R/L1 U
V
S/L2
T/L3 W
P/+
N/-
Inverter
∗5
ON
∗2
MC
MC
FR-BR
Motor
U
P TH1
V M
PR
W
TH2
∗4
FR-BU2
PR
P/+
P/+
∗1
N/-
N/-
BUE
SD
∗4
10 m or less
ON OFF CR1
Motor
M MC
MC
10 m
or less
∗1
P ∗3
P
N P
∗3
PR
BUE PR
A
SD
B
C
Brake unit Resistor unit
FR-BU2
page 689.)
2.10 Connection of stand-alone option units
OFF
∗5
A
B
C
∗4
CR1
TH1
TH2
MT-BR5
2. INSTALLATION AND WIRING
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