Mitsubishi Electric FR-A520-0.4K-NA Instruction Manual page 36

( 3 ) Connection of the conventional BU brake unit (option)
Connect the BU brake unit correctly as shown on the right. Incorrect connection will damage the inverter.
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 (6.56 feet).
If twisted wires are used, the distance should be within 5m (16.40 feet).
3. If the transistors in the brake unit should fail, the resistor will be extremely hot, causing a 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 high power factor converter (option)
When connecting the high power factor converter (FR-HC) to suppress power harmonics, wire as shown
below. Wrong 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".
NFB
Power
supply
NFB MC
T (Note 4)
Brake unit
HC HB
R S T R4 S4 T4
From FR-HCL02
INSTALLATION AND WIRING
Inverter
R 〈L 〉
U
1
S 〈L 〉
V
2
T 〈L 〉
W
3
Remove jumpers.
P 〈+〉 N 〈–〉
Discharge resistor
P
HA HB HC TB
PC
OCR
Constant-voltage
-
power supply
+
Comparator
BU brake unit
ON
OFF
MC
MC
High power factor converter
N P Y1 or Y2
26
Motor
IM
PR
OCR
N
(FR-A500)
R 〈L
RDY RSO SE
1
S 〈L
2
T 〈L
3
SD
RES
X10 (Note 3)
X11 (Note 3)
N 〈–〉
P 〈+〉
R1 〈L
S1 〈L
Inverter
〉
〉 (Note 1)
〉
〉
11
(Note 1)
〉
21