© Nexter 2014 - page 159

Equipment
157
ii
ENERGY MANAGEMENT AND DISTRIBUTION
SOFT START SOLUTION (S
3
)
MISSION
SCube is a soft-start systemwhich temporarily
reduces load and torque during the startup of
a motor. The system:
• 
reduces mechanical stresses on the motor
and the shaft,
• 
enables distribution cables of smaller cross-
section and consequently lower weight to
be used,
• 
improves the reliability and lifetime of the
drive.
There are mechanical* or electrical soft-start systems. The electrical systems act on motor torque
by temporarily reducing the voltage or current input.
This solution is widely used in stationary applications such as compressor pumps and fans which
do not have volume or weight constraints and which operate over limited temperature ranges.
TECHNICAL CHARACTERISTICS
SCube is an electronic system which limits the current (max. 800A) and controls the dI/dt (up
to 6,000A/s) on low-voltage networks (28VDC) during soft-start or during nominal operation
(overload protection: motor shutdown, isolation loss, etc.). The current limitation profiles are
configurable, giving SCube a wide range of uses
SCube uses MOS technology switches in a current-controlled half-bridge chopper configuration.
The working frequency is 25 kHz
A heat sink can be added to the SCube if required by the thermal operating environment and
the use profiles
APPLICATIONS
Air-land or naval embedded applications. In addition to motor management, SCube can also be
used for pre-loading low-voltage power networks..
* Using fluids or magnetic forces .
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