Mitsubishi Electric FR-A520-0.4K Instruction Manual page 39

(3) Connection of the brake unit (BU type)
Connect the BU type brake unit correctly as shown below. Incorrect connection will damage the inverter.
Remove jumpers across terminals HB-PC and TB-HC, then fit a jumper across terminals PC-TB.
Power
supply
Note: 1. For models 7.5K or less, remove the jumper across terminals PR-PX.
2. The wiring distance between the inverter, brake unit and discharge resistor should be within
2m.
If twisted wires are used, the distance should be within 5m.
3. When the transistor in the brake unit fails, the brake transistor bacomes extremely hot and it has
a chance to get fire. Therefore, install a magnetic contactor on the inverter's power supply side to
shut off current in case of failure.
4. For the power supply of 400V class, install a voltage-reducing transformer.
(4) Connection of the FR-HC type high power factor converter (FR-HC)
When connecting the high power factor converter (FR-HC) to suppress power harmonics, perform wiring
securely as shown below. Incorrect connection will damage the high power factor converter and inverter.
After making sure that the wiring is correct, set "2" in Pr. 30 "regenerative function selection".
R S
NFB
Power
supply
NFB
Remove
jumpers.
T(Note4)
MC
ON
OFF
Connect a
MC
jumper.
PC HA HB HC TB
OCR
High power factor converter (FR-HC)
T MC1 MC2 R4 S4 T4
R4 S4 T4
From FR-HCL02
R3 S3 T3
MC2
External box
MC1
R2 S2 T2
FR-HCL01
R S T
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INSTALLATION AND WIRING
MC Inverter
Motor
U
R
S V
T W
PR
PX
P/+ N/-
Discharge resistor
Remove
jumpers.
P PR
OCR
BU type brake unit
N P Y1 or Y2 RDY
30
IM
N
Inverter
RSO SE
R
S (Note 1)
T
SD
RES
X10 (Note 3)
X11 (Note 3)
N/–
P/+
R1
(Note 1)
S1