Selection
Selection examples
12
Network of several drives
12.5
12.5.5
L
12.5-8
EDS82EV903-1.0-11/2002
(
((
( Stop!
l All data given in this example only apply to coordinated and
rigid motions. For all other applications, the drive network must
be selected for static power.
(¶ 12.5-5, 12.5-6)
l If the controllers are not selected according to their application,
they can be damaged during operation.
If you consider dynamic processes in the network (motors operate with changing
power), the number of supply terminals can be reduced.
Important for the selection of supply terminals is the continuous power P
DC
and
the peak power P
max
of the network.
1. Continuous power required:
– Graphical determination. This method is usually reliable.
(¶ 12.5-9)
– Approximate calculation
n
P
â‹… t
Important
The approximate calculation cannot be used for networks with considerably
changing loads or controllers with rest phases.
P
DC
≈
i=1
i
i
T
T[s]:
P
i
[W]:
t
i
[s]:
Cycle time
Motor power during a cycle
Time of P
i
during a cycle
2. Graphical determination of peak power (¶ 12.5-9)
3. Consideration of power losses
Consider the power losses of all controllers connected to the network when
detecting the continuous power and peak power.
(¶ 12.5-4)
4. Selection of supply terminals
– Selecting a controller and/or regenerative power supply units
(¶ 12.5-5,
12.5-6)
– In addition, the maximum overload (max. 60 s) of the supply terminals
must be higher than the peak drive power of the network.
Specifying dynamic processes
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