Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 100

Use a brake resistor that has resistance and power consumption values higher than the following. Also, the brake resistor must
have a sufficient capacity to consume the regenerative power.
Voltage class Inverter
FR-A820-00046(0.4K)
FR-A820-00077(0.75K)
FR-A820-00105(1.5K)
FR-A820-00167(2.2K)
FR-A820-00250(3.7K)
200 V class FR-A820-00340(5.5K)
FR-A820-00490(7.5K)
FR-A820-00630(11K)
FR-A820-00770(15K)
FR-A820-00930(18.5K)
FR-A820-01250(22K)
FR-A840-00023(0.4K)
FR-A840-00038(0.75K)
FR-A840-00052(1.5K)
FR-A840-00083(2.2K)
FR-A840-00126(3.7K)
FR-A840-00170(5.5K)
FR-A840-00250(7.5K)
400 V class FR-A840-00310(11K)
FR-A840-00380(15K)
FR-A840-00470(18.5K)
FR-A840-00620(22K)
FR-A840-00770(30K)
FR-A840-00930(37K)
FR-A840-01160(45K)
FR-A840-01800(55K)
Set parameters as follows:
• Pr.30 Regenerative function selection = "1"
• Set Pr.70 Special regenerative brake duty according to the amount and frequency of the regenerative driving, and make
sure that the resistor can consume the regenerative power properly. (Refer to
• When the regenerative brake transistor is damaged, install a thermal relay as shown in the following sequence to prevent
overheat and burnout of the brake resistor. Properly select a thermal relay according to the regenerative driving frequency
or the rated power or resistance of the brake resistor.
<Example 1>
Inverter
MC
R/L1
Power
S/L2
Supply
T/L3
T
F
MC
OFF ON
OCR
Contact
MC
*1 Since the FR-A820-00630(11K) or higher and FR-A840-00310(11K) or higher are not provided with terminal PX, a jumper need not to be
removed.
CAUTION
• If the resistor selection is incorrect, overcurrent may damage the inverter built-in brake transistor. Besides, the resistor
may be burned due to overheat.
• If the selection of the thermal relay is incorrect, the resistor may be burned due to overheat.
Minimum resistance (Ω)
100
80
50
33
30
18
18
12
8.5
6.5
6.5
371
236
190
130
83
66
45
34
34
21
21
13.5
13.5
13.5
13.5
Thermal relay
(OCR)
Brake resistor
P/+
R
(P3)
PX
PR
Remove the jumper. (∗1)
Power consumption (kW)
1.44
1.81
2.89
4.38
4.81
8.02
8.02
12.0
17.0
22.2
22.2
1.66
2.61
3.24
4.74
7.42
9.34
13.7
18.1
18.1
29.3
29.3
45.6
45.6
45.6
45.6
page 689.)
<Example 2>
MC
R/L1
Power
S/L2
Supply
T/L3
T
F
B
ON OFF
C
OCR
MC
MC
Contact
2.10 Connection of stand-alone option units
Thermal relay
Inverter
(OCR)
Brake resistor
P/+
R
(P3)
PX
PR
Remove the jumper. (∗1)
2. INSTALLATION AND WIRING
1
2
3
4
5
6
7
8
9
10
99