Mitsubishi Electric FR-A800 Series Instruction Manual page 103

 Connection example with the FR-BR(-H) resistor unit
*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. When using twisted pair cable, use
the cable within 10 m.
*5 The contact between TH1 and TH2 is closed in the normal status and is open at a fault.
*6 Terminal P3 is equipped in the FR-A820-00770(15K) to 01250(22K), and FR-A840-00470(18.5K) to 01800(55K). Terminal P3 has the same
function as terminal P\+ on the inverter.
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.
*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. When using twisted pair cable, use
the cable 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
102
2. INSTALLATION AND WIRING
2.10 Connection of stand-alone option units
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MCCB
MC
Three phase AC
power supply
MCCB
MC
Three phase
AC power
supply
search engine
T *2
MC
Motor
U
R/L1
S/L2 V M
W
T/L3
*4
Inverter
*6
P/+
PR
*3
(P3)
PX
*1
N/-
*4
10 m or less
∗2
T
ON
Motor
R/L1 U
V
S/L2 M
MC
T/L3 W
∗1
P/+ P
N/- N P
∗3
PR
BUE
A
SD
B
C
Inverter
Brake unit
∗5
FR-BU2
page
ON OFF
MC
FR-BR
*5
P TH1
PR
TH2
FR-BU2
PR
A
P/+ B
N/- C
BUE
SD
OFF CR1
MC
10 m
∗4
or less
CR1
∗3
P TH1
PR
TH2
Resistor unit
MT-BR5
724.)