6
05.01
6.7 DC link options
6-185
© Siemens AG 2008 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 05/2008 Edition
The energy for dynamic operations is obtained as follows:
The following applies for braking or accelerating operations within time t
V
of a
drive from one speed/velocity to another:
w = ½ S P S t
V
For rotary drives with
P = S η
G
M
Mot
S (n
Mot
max
– n
Mot
min
)
9 550
For linear drives with
P = F
Mot
S (V
Mot
max
– V
Mot
min
) S 10
–3
S η
G
with η
G:
Braking η
G
= η
M
S η
INV
Acceleration η
G
= 1/(η
M
S η
INV
)
w [Ws] Energy
P [kW] Motor power
t
V
[s] Time of the operation
M
mot
[Nm] Max. motor torque when braking or accelerating
F
mot
[N] Max. motor force when braking or accelerating
n
mot
max
[RPM] Max. speed at the start or the end of the operation
n
mot
min
[RPM] Min. speed at the start or end of the operation
v
mot
max
[m/s] Max. velocity at the start or end of the operation
v
mot
min
[m/s] Min. velocity at the start or end of the operation
η
G
Total efficiency
η
M
Motor efficiency
η
INV
Inverter efficiency
Torque M and force F depend on the moved masses, the load, and the accel-
eration in the system.
If precise data is not available for the previously specified factors, then generally
rated/nominal data is used instead.
The central capacitor module should preferably be located at the end of the
system group. The connection is made using the DC link busbar.
Engineering
information
6 Infeed Modules11.05
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