Mitsubishi Electric FR-E800 Series Instruction Manual page 446

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
Inverter
class
FR-E820-0030(0.4K)
FR-E820-0050(0.75K)
FR-E820-0080(1.5K)
FR-E820-0110(2.2K)
FR-E820-0175(3.7K)
FR-E820-0240(5.5K)
200 V class
FR-E820-0330(7.5K)
FR-E820S-0030(0.4K)
FR-E820S-
0050(0.75K)
FR-E820S-0080(1.5K)
FR-E820S-0110(2.2K)
FR-E840-0016(0.4K)
FR-E840-0026(0.75K)
FR-E840-0040(1.5K)
400 V class FR-E840-0060(2.2K)
FR-E840-0095(3.7K)
FR-E840-0120(5.5K)
FR-E840-0170(7.5K)
FR-E860-0017(0.75K)
FR-E860-0027(1.5K)
FR-E860-0040(2.2K)
575 V class
FR-E860-0061(3.7K)
FR-E860-0090(5.5K)
FR-E860-0120(7.5K)
*1 The resistance should be 200 Ω or more at 100% ED. The following shows the brake duty when the resistance is less than 200 Ω.
120
Brake duty (% ED)
100
80
60
40
30
20
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.
• When the regenerative brake transistor is damaged, install a thermal relay to prevent overheat and burnout of the brake
resistor. (Refer to the Instruction Manual (Connection) to install a thermal relay.) Properly select a thermal relay according
to the regenerative driving frequency or the rated power or resistance of the brake resistor.
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.
Parameters referred to
Pr.57 Restart coasting timepage
Pr.178 to Pr.189 (Input terminal function
Pr.190 to Pr.196 (Output terminal function
Minimum resistance
(Ω)
100
80
60
60
40
25
20
100
80
60
60
371
236
205
180
130
94
67
350
300
260
190
140
100
FR-E820(S)-0050(0.75K)
(80 Ω at minimum)
30%ED
FR-E820(S)-0030(0.4K)
(100 Ω at minimum)
0
60 80 100 120
403, page 408
selection)page 328
selection)page 292
Power consumption
(kW)
1.5
1.9
2.5
2.5
3.8
6.1
7.6
1.5
1.9
2.5
2.5
1.6
2.4
2.8
3.2
4.4
6.1
8.6
2.4
2.8
3.3
4.5
6.1
8.5
100% ED (at 200 Ω or more)
140 160 180 200
Minimum brake resistance (Ω)
220
16. (G) Control Parameters
16.8 Regenerative brake selection
11
12
13
14
15
16
17
18
19
20
445