Mitsubishi Electric 800 Series Instruction Manual page 84

 Connection of a brake resistor other than the FR-ABR
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-
*1
0050(0.75K)
Three-phase
FR-E820-0080(1.5K)
200 V class
FR-E820-0110(2.2K)
FR-E820-0175(3.7K)
FR-E820-0240(5.5K)
FR-E820-0330(7.5K)
FR-E840-0016(0.4K)
FR-E840-0026(0.75K)
FR-E840-0040(1.5K)
Three-phase
FR-E840-0060(2.2K)
400 V class
FR-E840-0095(3.7K)
FR-E840-0120(5.5K)
FR-E840-0170(7.5K)
FR-E820S-
*1
0030(0.4K)
Single-
FR-E820S-
phase 200 V
*1
0050(0.75K)
class
FR-E820S-0080(1.5K)
FR-E820S-0110(2.2K)
*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.
Brake duty (% ED)
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 the FR-E800 Instruction Manual (Function).)
• 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
ON OFF
OCR
Contact
MC
Minimum resistance Power consumption
(Ω)
*1 100 1.5
80 1.9
60 2.5
60 2.5
40 3.8
25 6.1
20 7.6
371 1.6
236 2.4
205 2.8
180 3.2
130 4.4
94 6.1
67 8.6
100 1.5
80 1.9
60 2.5
60 2.5
120
100
80
FR-E820(S)-0050(0.75K)
60 (80 Ω at minimum)
40
30%ED
30
FR-E820(S)-0030(0.4K)
20
(100 Ω at minimum)
0
60 80 100 120
Thermal relay
(OCR)
Brake resistor
P/+ R
PR
(kW)
100% ED (at 200 Ω or more)
140 160 180 200
Minimum brake resistance (Ω)
<Example 2>
MC Inverter
R/L1
Power
S/L2
Supply
T/L3
T
F
B
MC
ON OFF
C
OCR
Contact
MC
2.9 Connection of stand-alone option units
220
Thermal relay
(OCR) Brake resistor
P/+ R
PR
2. Installation and Wiring
1
2
3
4
5
6
7
8
9
10
83