Configuration
5.2 Configuring workflow
1FN3 linear motors
120 Configuration Manual, 10/2018, 6SN1197-0AB86-0BP2
In systems where direct drives are used on controlled infeeds, electrical oscillations can
occur with respect to ground potential. These oscillations are, among other things,
influenced by:
• The lengths of the cables
• The rating of the infeed/regenerative feedback module
• The type of infeed/regenerative feedback module (particularly when an HFD
commutating reactor is already present)
• The number of axes
• The size of the motor
• The winding design of the motor
• The type of line supply
• The place of installation
The oscillations lead to increased voltage loads and may damage the main insulation!
• To dampen the oscillations we recommend the use of the associated Active Interface
Module or an HFD reactor with damping resistor. For specific details, refer to the
documentation of the drive system being used or contact your local Siemens office.
Note
The corresponding Active Interface Module or the appropriate HFD line reactor must be used
to operate the Active Line Module controlled infeed unit.
Calculation of the required infeed
Dimensioning the Active Infeed
Use the drive's power balance to dimension the Active Infeed.
The first important quantity to know is the mechanical power P
MECH
to be produced. Based
on this power value, it is possible to work out the electrical active power P
Netz
to be drawn
from the power system by adding the power loss of the motor P
V Mot
, the power loss of the
Motor Module P
V MoMo
and the power loss of the Active Infeed P
V AI
to the mechanical power
P
MECH
:
P
Netz
= P
mech
+ P
V Mot
+ P
V MoMo
+ P
V AI
.
The active power to be drawn from the power system depends on the line voltage U
Netz
, the
line current I
Netz
, and the line-side power factor cosφ
Netz
as defined by the relation
P
Netz
= √3 • U
Netz
• I
Netz
• cosφ
Netz
.
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