Engineering Information Is Applicable For Ui 5 Kw, 10 Kw, 28 Kw And Pr Module - Siemens SIMODRIVE 611 digital Configuration Manual

6 Infeed Modules
6.7 DC link options
6.7.5 Engineering information is applicable for UI 5 kW, 10 kW, 28 kW
and PR module
Load duty cycles
for braking
operations
Table 6-22 Examples
Values
E
max
Pn
P
max
Example
A =
T =
A =
T =
1) As a result of the mechanical dimensions, the resistor can absorb a relatively high level of energy.
6-194
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Sizing the load duty cycles with pulsed resistors
E [Ws] Regenerative feedback energy when braking a motor from n
to n
1
T [s] Period of the braking load duty cycle
A [s] Load duration
2
J [kgm ] Total moment of inertia (including J motor)
M [Nm] Braking torque
n [RPM] Speed
Pn [W] Continuous power rating of the pulsed resistor
P [W] Peak power of the pulsed resistor
max
E [Ws] Energy of the pulsed resistor for a single braking operation
max
P (kW)
P
max
P
n
0 kW
A
T
Fig. 6-23 Load duty cycle for internal and external pulsed resistors
PR 0.2/10 kW
13500 Ws
10000 W
The following conditions must be fulfilled:
1. P w M S 2 S π S n/60
max
w E; E=J S [(2 S π S n
2. E
max
3. P w E/T
n
SIMODRIVE 611 Configuration Manual (PJU) – 05/2008 Edition
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0 kW
A t (s)
PR 0.3/25 kW
1)
7500 Ws
200 W 300 W
25000 W
0.2 s 0.12 s
10 s 10 s
1.35 s 0.3 s
67.5 s 25 s
2 –(2 S π S n 2
/60) /60) ]/2
2 1
© Siemens AG 2008 All Rights Reserved
Industry Automation
02.07 11.05
05.01
2
PR 1.5/25 kW
180000Ws
1500 W
25000 W
0.6 s
10 s
7.2 s
120 s
J
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