Connection Of The Brake Unit (Fr-Bu); Connection Of The Brake Unit (Bu Type) - Mitsubishi Electric FR-A800 Series Instruction Manual

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.
The FR-BU is compatible with the FR-A820-03160(55K) or lower and the FR-A840-01800(55K) or lower.
*1 When wiring, make sure to match the terminal symbols (P/+, N/-) on the inverter and on the brake unit (FR-BU(-H)). (Incorrect connection will
damage the inverter.)
*2 When the power supply is 400 V class, install a stepdown transformer.
*3 For the FR-A820-00490(7.5K) or lower and FR-A840-00250(7.5K) or lower, be sure to remove the jumper across terminals PR and PX.
*4 The wiring distance between the inverter, brake unit (FR-BU) and resistor unit (FR-BR) must be within 5 m. When using twisted pair cable, use
the cable within 10 m.
*5 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
• If the transistors in the brake unit should become faulty, the resistor will overheat. Install a magnetic contactor on the inverter's
input side and configure a circuit that shut off the current in case of a fault.
• Do not remove the jumper across terminals P/+ and P1 except when connecting a DC reactor (FR-HEL).

2.10.4 Connection of the brake unit (BU type)

Connect the brake unit (BU type) correctly as follows. Incorrect connection will damage the inverter. Remove the jumpers
across terminals HB and PC and terminals TB and HC on the brake unit, and fit one across terminals PC and TB. The BU type
brake unit is compatible with the FR-A820-03160(55K) or lower and the FR-A840-01800(55K) and lower.
Three-phase
AC power
supply
*1 When the power supply is 400 V class, install a stepdown transformer.
*2 For the FR-A820-00490(7.5K) or lower and FR-A840-00250(7.5K) or lower, be sure to remove the jumper across terminals PR and PX.
*3 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.
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MCCB
Three-phase AC
power supply
MC
MCCB
search engine
T *2
MC
Motor
R/L1 U
S/L2 V
T/L3 W
Inverter
*5
PR
P/+
*3
(P3)
PX
N/-
10 m or less
*1
T
Inverter
Motor
U
R/L1
V M
S/L2
W
T/L3
N/-
*3
P/+(P3)
PR
*2
PX
Discharging
resistor
ON OFF
MC
MC
FR-BR
P TH1
M
PR
TH2
FR-BU
PR
HA
P/+
HB
*1
N/-
HC
*4
ON OFF
MC
MC
Brake unit
Remove the
(BU type)
jumper
TB
N
OCR HC
HB
HA
OCR
PC
PR
Fit a jumper
P
2. INSTALLATION AND WIRING
2.10 Connection of stand-alone option units
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