Power Distribution Of Controllers - Lenze E70AC Series Hardware Manual

Utilisation factor
Please consider the utilisation factors when determining P
requirements if the rated power is not fully used.
Simultaneity factor
Please consider the simultaneity factor when determining P
requirements if the drives do not run simultaneously or in opposite direction (braking).
Braking operation
After determining the brake power P
by the brake choppers and brake resistors in the DC bus.
Other conditions
The power supply unit must be able to provide the required power (arithmetic mean).
The overload requirements must be within the permissible range:
(¶ 7.4.2)
3−min cycle (1 min overload with 150 % and 2 min recovery time with 75 %)
ƒ
15−s cycle (3 s overload with 200 % and 12 s recovery time with 75 %)
ƒ
For detailed information on the overload capacity, please see the Technical data.
7.5.2

Power distribution of controllers

In a DC−bus operation, the power from the AC mains is stored in the DC bus and consumed
by several controllers. Drive groups with non−synchronous power consumption, partial
load or excess energy from braking operations are suitable for establishing a DC−bus
connection.
L1, L2, L3
P
LN
~
P
DC1
=
P
aN
U, V, W
EDS700ACBA EN 5.1
=
P
DC2
P
V
~
L1, L2, L3 Mains connection (3/PE AC)
P Input mains power
Lr
P Total DC−bus power
DC1
P DC−bus power available for the DC bus
DC2
P Power loss
loss
P Output power
ar
U, V, W Motor connection
l
DC−bus operation
Basic dimensioning
Power distribution of controllers
, ensure that the brake power can be provided
BRtotal
. Reduce the power
DCtotal
. Reduce the power
DCtotal
Power distribution
119
7