Catalog PM 21 2013 - Siemens Industry, Inc.

© Siemens AG 2013
SINAMICS S120 drive system
Line Modules and line-side components
Basic Line Modules in booksize format
■ Characteristic curves (continued)
Braking power with external braking resistor
The following load cycles are defined for the braking modules of
the 20 kW and 40 kW Basic Line Modules:
P
2 x
P rated
1.5 x
P rated
G_D211_EN_00185a
Power P
40
kW
30
20
G_D211_EN_00187a
3
10
P d
3 s 46 s
300 s
t
35
The maximum possible braking power P max is calculated using
the following formula:
P max = U 2 /R
U = Activation threshold
R = Resistance value of the external braking resistor
The maximum braking power is achieved with the smallest
permissible resistance value. The maximum possible braking
power falls at larger resistance values.
0
15
20
25
Braking power of the 20 kW Basic Line Modules depending on the connected
braking resistor
When the recommended braking resistor is used, the following
values result for the maximum braking power or continuous
braking power:
Braking resistor 6SE7023-2ES87-2DC0
Resistance value = 20 Ω → max. braking power = 30 kW;
continuous braking power = 5 kW
30
Max. braking power
continuous braking power
40
Resistance
Ω 45
Power P
80
kW
60
G_D211_EN_00188a
40
20
0
7.5 10 12.5 15 17.5 20 Ω 22.5
Max. braking power
continuous braking power
Resistance
Braking power of the 40 kW Basic Line Modules depending on the connected
braking resistor
When the recommended braking resistor is used, the following
values result for the maximum braking power or continuous
braking power:
Braking resistor 6SE7028-0ES87-2DC0
Resistance value = 8 Ω → max. braking power = 75 kW;
continuous braking power = 10 kW (limited by braking module)
Siemens PM 21 · 2013
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