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1.13 Selection criteria
The soft starter DS7
the supply network
①
. The circuit type (Δ / ) of the motor must be selected according to
motor
②
the supply voltage ①. The rated output current I
greater than/equal to the rated motor current.
①
U, I, f
③
230 / 400 V ∆ /
Figure 9:
Selection criteria
When selecting the drive, the following criteria must be taken into account:
•
Type of motor (e.g.three-phase asynchronous motor)
•
Mains voltage = rated operating voltage of the motor (e.g. 3 AC ~ 400 V),
•
Rated motor current (recommended value, dependent on the circuit type
and the power supply),
•
Load torque (quadratic, linear),
•
Starting torque,
•
Ambient air temperature (rated value +40 °C).
￫
With heavy starting duty motors, the soft starter must be
overdimensioned in terms of its overload capacity.
￫
In the case of single-phase AC motors (￫ page 20), the
selection must be based on the mains voltage (= the motor's
rated operating voltage) and the rated motor current for the
specific line frequency.
DS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com
is selected on the basis of the supply voltage U
③
and the rated operational current of the assigned
②
4.6 / 2.6
cos ϕ
0.81
1.1 kW
min
-1
1430
50 Hz
1 Device series DS7
1.13 Selection criteria
of the soft starter must be
e
A
of
LN
25
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