406 Appendix: Resistor braking
Equations for selecting the resistor:
where
R = selected brake resistor value (ohm)
P
Rmax
= maximum power during the braking cycle (W)
P
Rave
= average power during the braking cycle (W)
E
Rpulse
= energy conducted into the resistor during a single braking pulse (J)
t
on
= length of the braking pulse (s)
T = length of the braking cycle (s).
Resistor types shown in the table are pre-dimensioned resistors using the maximum
braking power with cyclic braking shown in the table. Resistors are available from
ABB. Information is subject to change without further notice.
Type R
min
R
max
P
BRmax
Selection table by resistor type
ACS355-
CBR-V / CBT-H
2)
Braking time
3)
x = E/U
1)
ohm ohm kW hp 160 210 260 460 660 560 s
1-phase U
N
= 200…240 V (200, 208, 220, 230, 240 V)
01x-02A4-2 70 390 0.37 0.5 90
01x-04A7-2 40 200 0.75 1 45
01x-06A7-2 40 130 1.1 1.5 28
01x-07A5-2 30 100 1.5 2 19
01x-09A8-2 30 70 2.2 3 14
3-phase U
N
= 200…240 V (200, 208, 220, 230, 240 V)
03x-02A4-2 70 390 0.37 0.5 90
03x-03A5-2 70 260 0.55 0.75 60
03x-04A7-2 40 200 0.75 1 42
03x-06A7-2 40 130 1.1 1.5 29
03x-07A5-2 30 100 1.5 2 19
03x-09A8-2 30 70 2.2 3 14
03x-13A3-2 30 50 3.0 4 16
03x-17A6-2 30 40 4.0 5 12
03x-24A4- 2 18 25 5.5 7.5 45
03x-31A0-2 7 19 7.5 10 35
03x-46A2-2 7 13 11.0 15 23
t
on
P
Rmax
P
Rave
T
150000
P
Rmax
Eq. 1. U
N
= 200…240 V:
450000
P
Rmax
U
N
= 380…415 V:
615000
P
Rmax
U
N
= 415…480 V: R =
P
Rmax
· E
Rpulse
=
t
on
Eq. 2.
P
Rmax
· P
Rave
=
t
on
T
Eq. 3. For conversion, use 1 hp = 746 W.
R =
R =
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