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Digital DC drives from Control Techniques have been

chosen for the latest phase in the upgrading of cranes

in La Spezia Container Terminal (LSCT) in northern

Italy. One of the last cranes to be refurbished is a ship-

to-shore (STS) gantry crane manufactured by Italian

crane company MGM OMG. For this project, Emerson

Control Techniques Italy was responsible for replacing

all medium voltage electrical equipment, low-voltage

auxiliaries, drives, the controlling PLC and the crane

management system. They also replaced the DC hoist

motors with new ones from sister company Leroy

Somer.

The customers list of requirements for the latest STS

gantry crane was demanding. They needed rapid container

handling, fast and precise crane positioning to provide

the required productivity, maximum crane availability

and reliability, as well as excellent technical support and

effective preventative maintenance utilising an improved

faults analysis facility.

Hoisting, trolley, boom and gantry movements are now

driven by DC motors, controlled by Mentor MP digital

drives from Control Techniques that are connected via a

Profibus network to an S7-300 PLC.

The completed OMG crane features:

Two 1200 A Mentor MP drives controlling 290 kW DC

LSK Leroy Somer hoist motors

A 60 tonne lifting capacity under the spreader

A lift rating of 70 tonnes

Lift speeds of 90 m/min (rated load) and 150 m/min

(unloaded).

Each hoist drive is fitted with a plug-in SM-Applications

module: a second processor, connected by CTNet and using

a load-balancing function to control container hoisting.

With the spreader empty, the SM-Applications modules

enable movements at the maximum programmed speeds.

Crane productivity is achieved using a series of bespoke

basic, modular and open-ended software packages,

developed by Control Techniques specifically for crane

control.

KEY BENEFITS

RAPID CONTAINER HANDLING FAST AND PRECISE CRANE POSITIONING EXCELLENT TECHNICAL SUPPORT MAXIMUM CRANE AVAILABILITY AND RELIABILITY

CONTROL TECHNIQUES DRIVES WIN AGAIN FOR ITALIAN CRANE REFURBISHMENT

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For further information please visitwww.controltechniques.com

These are programmed into the SM-Applications modules

and optimise movements, trajectories, position location

and load swaying, in order to relieve the operator of these

delicate and repetitive tasks.

Four 470 A Mentor MP

drives control the

four 30 kW DC trolley

motors to give a

dockside speed of up

to 160 m/min. One 470 A

Mentor MP controls the 120 kW

DC boom motor and two 470 A Mentor MP drives control

the sixteen 15 kW DC gantry motors, which have a travel

speed of 60 m/min.

Control Techniques Crane Management System (CMS),

is integrated into its basic software and includes control

modules for diagnostics and maintenance. These software

packages automatically signal events as they occur, guiding

the operator in manoeuvres and assisting technicians with

repair and preventative maintenance operations.

Mentor MP is designed to withstand extremely harsh

conditions. The drive is reversible, giving maximum

speed control during acceleration and deceleration, and

also saves energy by using regeneration during braking.

The Mentor MP range of digital DC drives spans output

currents from 25 A to 7400 A, with all sizes sharing the

same control, monitoring and communications features.

A comprehensive self-tuning algorithm gives improved

current loop performance for a faster and more uniform

response at all speeds. Drive performance is also enhanced

with full PID digital speed control.

Mentor MP drives feature a series of user-configurable

functions (reference-follower management, electric

shaft function, digital or analogue feedback, torque

control, etc.) that are arranged logically in different

menus and preconfigured with default values to facilitate

commissioning.

During the last eight years, Emerson Control Techniques

has been responsible for the electrical refurbishment of ten

STS cranes, eight rail-mounted gantry cranes (RMGs), four

rubber-tyred gantry cranes (RTGs) and one mobile harbour

crane (MHC) at La Spezia.

La Spezia Container Terminal (LSCT), owned by Contship

Italia Group, is Italys most important cargo-handling and

container terminal and is the countrys most advanced

port in terms of high technology logistics.

The terminal is capable of

handling 1,200,000 TEUs

(standard 20 foot

equivalent container

units), is equipped

with 11 STS cranes,

eight RMG cranes

for park stacking,

10 RTG cranes and

two MHCs.