Trade fairs - Lenze

ting work. The system is capable of
changing a tool holder for different
models fully automatically. It detects
which component has arrived, and
brings the appropriate tool holder into
position accordingly.
Time is money – and changes have
to be made quickly. This is no easy task,
especially since the rotary table can
weigh 17 tonnes including its load. But
in spite of its mass, the table requires
just six to seven seconds for a half rotation.
The asynchronous geared motor
from Lenze which turns the carousel has
a maximum drive power of 22 kW and
delivers the necessary torque of 7,800
Newton metres.
Strength, however, is not all that is
required. Precision is also necessary
when accelerating and braking, since
narrow tolerances must be observed
when the component moves from the
tool holder to the welding station. Four
sensors are attached to the rotary table
for monitoring the positions. A 9400
Servo Drive with a power output of 30 kW
controls the motor and its positioning.
Motion profiles are stored on a pluggable
module. Separating the hardware
The C-Class is the best-seller in the Mercedes-Benz range.
and software in this way has the advantage
that the system can be restarted
very quickly after replacing a controller,
without the new unit requiring lengthy
programming. When the system requires
servicing, this module considerably
reduces expensive downtimes.
Lenze drive technology was also
used in the Turnflex’s internal conveyor
technology which moves the tool holders
in and out. A 10 kW synchronous servo
motor combined with an 11 kW 9400
Servo Drive powers a conveyor belt on
the linear sections. Precise movements
are once again necessary to ensure that
the tool holder hooks exactly into the
belt’s lock, enabling it to be transported
safely.
Safety considerations were high on
the list of priorities when the Turnflex’s
drive technology was designed. Regulations
governing the protection of
persons are very strict. Lenze has
designed its series of controllers in a
modular form, which enables the necessary
safety categories to be fulfilled
easily and reliably using plug-in safety
modules. Their functions satisfy the
demands of IEC 61508 SIL3, and have
Cover story
Servo Drives 9400
The controllers in the 9400 Servo Drive
series are designed as Single Drives and
Multi Drives. The Single Drives combine
mains feed, DC bus and inverter in a single
unit. Integrated filter elements and a brake
chopper facilitate autonomous operation
within decentralised installations. The
Multi Drives have been optimised for centralised,
compact multi-axis installations
with all the benefits of a shared DC bus.
The dimensions of the power section
combined with the intelligent management
of switching frequencies enables peak
currents of up to four times more than the
drive continuous current. The drives support
feedback-based and encoder-free control
processes. The assembly equipment and
drive electronics are kept separate up to a
motor output of 11 kW. This makes them
easier to assemble and install. The mounting
base incorporates all of the power
connections such as mains supply, motor
connections and busbars for the DC bus in
Multi Drives. The series covers an overall
power range of 0.37 to 400 kW.
Servo Drives 9400.
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