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Brake Chopper
4.5 Brake Chopper and Brake Resistor
4.5.1 Braking Ratio
Brake resistors with different power ratings are available to dissipate braking en-
ergy when the frequency converter is in generator mode. The following table
lists the details of brake chopper and brake resistor corresponding to each
brake power in the condition that a certain braking ratio is given.
ED Braking ratio
Tb Braking time
Fig. 4-2: Braking ratio
4.5.2 Recommended Brake Chopper and Brake Resistor
When braking voltage is 750 V, ED = 10 % and braking torque is 100%, the rec-
ommended brake chopper and brake resistor are listed as below.
Brake pow-
Brake chopper
er (KW)
type code
0.4
Internal
0.75
Internal
1.5
Internal
2.2
Internal
3.0
Internal
4.0
Internal
5.5
Internal
7.5
Internal
11.0
Internal
15.0
Internal
18.5
Internal
22.0
Internal
30
37
FEAE07.1-VA1-
NNNN
45
55
DOK-RCON04-VFC*BRAKE**-IT01-EN-P
Tc
Brake resistence(Ω)
Number of
brake
Recom-
choppers
mended
value
-
750
-
750
-
400
-
250
-
150
-
150
-
75
-
75
-
40
-
40
-
32
-
25
1
20
1
16
1
13.6
1
20
Bosch Rexroth AG
Brake Chopper Overview
Engineering cycle time in application
Power of brake resis-
tor(KW)
Recom-
Min. value
mended
Min. value
value
-
0.08
-
0.08
-
0.26
-
0.26
-
0.39
-
0.39
-
0.78
-
0.78
-
1.56
-
1.56
-
4.80
-
4.80
≥8
6.00
≥8
9.60
≥8
9.60
≥8
6.00
Number of
paralleled
brake re-
sistors
-
1
-
1
-
1
-
1
-
1
-
1
-
1
-
1
-
1
-
1
-
1
-
1
≥4
1
≥5
1
≥6
1
≥7
2
19/65
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