Energy Saving for Turkey's Biggest Shipyard Crane
When power regeneration for
energy saving was specified for Turkey’s biggest ever shipyard
crane, the crane manufacturer, Vinçsan, had no hesitation in
turning to their local Control Techniques Drive Centre for
help.
The crane, recently built for the end-user Tersan Tersanecilik,
a ship-builder who is in the process of fitting out a new
state-of-the-art shipyard in Yalova in north-western Turkey, is
believed to be the largest capacity overhead crane in the whole of
Turkey. It has a lifting capacity of 2x275 tonnes (SWL 550
tonnes), and will be in operation for 18 hours a day once the
shipyard is in full production.
Solutions offered by other leading drives suppliers failed to
meet the response time required for regeneration in the supply
transient conditions of the site, whilst the Control Techniques
scheme, based on three modular drives, gives the required
performance.
The regeneration set-up comprises three paralleled Unidrive SPMD
1424 AC modular drives in regenerative mode, rated at 500kW and
feeding all the motor drives on the crane. The two main 275
ton hoisting motors, from Control Techniques’ sister company Leroy
Somer, are driven by further SPMD1424 modular AC drives, an
auxiliary hoisting motor is controlled by a 55kW Unidrive SP AC
drive and a travel motor by a 44kW Commander SK AC drive.
There is a total of 20 crane travelling motors,
which are electrically controlled in groups of five, each group
being controlled by a modular SP 1421 drive.
All of the drives are under the overall control of a master PLC
that communicates with all of the drives by Profibus DP, each drive
being fitted with a special SM module for this purpose.
The system features control of the brakes via the
drive software and constant power hoisting via feedback from
load-cells to prevent overload / over-speed. During lowering
operations, the system automatically moves into regeneration mode
to feed energy back into the common bus system to provide
significant savings in overall energy consumption.
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