Rockwell Automation 20G PowerFlex 750-Series AC Drives User Manual
Page 214
214
Rockwell Automation Publication 750-RM002B-EN-P - September 2013
Chapter 4
Motor Control
Step 4 – Determine the Minimum Resistance
Each drive with an internal DB IGBT has a minimum resistance associated with
it. If a resistance lower than the minimum value for a given drive is connected, the
brake transistor will likely be damaged. Below is a table of minimum resistances
for frame 2 through 7 PowerFlex 750-Series drives.
Step 5 – Choosing the Dynamic Brake Resistance Value
To avoid damage to this transistor and get the desired braking performance, select
a resistor with a resistance between the maximum resistance calculated in Step 3
and the minimum resistance of the drive IGBT.
Frame
400V
480V
ND kW
Catalog Code
Min Resistance
Max DB Current
ND HP
Catalog Code
Min Resistance
Max DB Current
2
0.75
C2P1
31.6 25
1.0
D2P1
31.6
25
1.5
C3P5
31.6
25
2.0
D3P4
31.6
25
2.2
C5P0
31.6
25
3.0
D5P0
31.6
25
4.0
C8P7
31.6
25
5.0
D8P0
31.6
25
5.5
C011
31.6
25
7.5
D011
31.6
25
7.5
C015
31.6
25
10
D014
31.6
25
11
C022
22.6
34.9
15
D022
22.6
34.9
3
15
C030
31.6
25
20
D027
31.6
25
18.5
C037
31.6
25
25
D034
31.6
25
22
C043
16.6
47.6
30
D040
16.6
47.6
4
30
C060
15.8
50
40
D052
15.8
50
37
C072
15.8
50
50
D065
15.8
50
5
37
C072
7.9
100
50
D065
7.9
100
45
C085
7.9
100
60
D077
7.9
100
55
C104
7.9
100
75
D096
7.9
100
6
55
C104
3.3
239.4
75
D096
3.3
239.4
75
C140
3.3
239.4
100
D125
3.3
239.4
90
C170
3.3
239.4
125
D156
3.3
239.4
110
C205
3.3
239.4
150
D186
3.3
239.4
132
C260
3.3
239.4
200
D248
3.3
239.4
7
132
C260
2.4
329
200
D248
2.4
329
160
C302
2.4
329
250
D302
2.4
329
200
C367
2.4
329
300
D361
2.4
329
250
C456
1.65
478.8
350
D415
1.65
478.8