Crane Service Syatem

8/2/2019 Crane Service Syatem

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crane solutions and models


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IntroductionThis presentation will help you to sell more easy to crane

applications.

Please find attached:

- Reference customers & applications

- Inverter specific functions

- Necessary Options

- System solutions


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Main crane types Tower crane

Bridge crane

Gantry / portal crane

Jib crane


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Additional crane application

information Following some information which should help to get

a better understanding of the crane marketrequirements and where has advantages anddisadvantages.

Critical issues for certain crane types will bementioned.

Feel free to use any of these information for yourcustomers.


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Typical CranesHigh overload (Cranes are often overloaded from user

side, and used outside the manufacturers specification)

Smooth movementControl of mechanical BrakeSecure magnetization of sliding rotor

motors (Works good with FR-A700)Hoist speed 5-25m/minTravel speed 15-80m/minBrake resistor need high specification

(40-50% power of hoist motor capacity,for 100% ED, because of long travel distance)


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Typical for Cranes 90% of the hoists use an encoder feedback

70% of bigger cranes use

piezo-ceramic load sensor for load management For retrofit you have to take care of insulation class of

the motor and shaft voltage ( insulated bearings).


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performance High overload capacity Easy and precise auto tuning High temperature without dreading

(temp. under the roof can be 10-20C higher than on the ground) No book size inverter, standard cabinets for cranes

have mainly 300mm depth Robust and dirt resistant design

Internal structure is built to resist high vibration levels(which are usual for cranes) Steady and precise speed control


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Things to take care of

for tower cranes Torsion forces due to wind or load movement

-> Independent torque limit for each workingquadrant in FR-A700

Instantaneous power failuredue to brush contacts

-> Instantaneous power failure function in FR-A700

Safe working angles

-> Define SW limit switches in inbuilt PLC function


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for bridge and portal cranes Travel motor can be way bigger than hoist motor (Travel

structure can be really heavy. E.g. a bridge crane with 3.6 t nominal load and28 m wingspan can reach a mass of 25 t)

Often two motor are connected to one inverter.Combined according to there motor capacity

(Combination 1: hoist with boom hoist and trolley with gantrycombination 2: hoist with gantry and trolley with boom) A700 overload capacity is meeting the requirements (150% 60s is

enough for travel, 150% 60s and 200% 3s is enough for hoist)

Electrical design of control is more complexdue to safety issues

Mainly brushes are used, due to long moving distance and

existing rail structure(Voltage dips/spikes should be avoided by using more than one set ofpickups. AC choke and IPF-function helps too) Hoist drive for cranes bigger 15 t often have a dual drum with

a single rope (Problem is to have equal amount of rope on the twodrums)

For container cranes a teachable positioning is used


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for Jib cranes Easy crane structure,

so only general requirements


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Crane Types Categorisation Due to the wide range of crane types it makes sense to

divide the crane applications into different groups dueto the complexity


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Crane Types

Low complex Controlled manually by joystick / push buttons in jog

operation No measurements of speed,

position or load Inverter technical features like

s-curve acceleration, brake function etc. is enough Inbuilt PLC is used for speed limit switches and

pendant control


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Crane Types

Mid complex without external PLC Controlled manually by joystick in jog operation,

or easy vertical positioning Encoder feedback

Inverter technical features like s-curve acceleration,brake function etc. is enoughAdjustment to application by internal PLC Load management with external sensor and inbuilt

PLC

Inbuilt PLC is used for speed limit switches andpendant control Displaying data on HMI or PU07 Use of regenerative units


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Crane Types

High complex with external PLC Control automatically and manually Encoder feedback Network communication (Often Prefabs and Ethernet) Positioning vertical and horizontal High complex functions like safety, load management,

synchronising all moving axis are realised in theexternal PLC

Optimised duty cycle, by automates movement Displaying data on HMI Use of regenerative units


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FR-A701 is a FR-A700 with activefront end, which allows 100% torque continuousregeneration and 150% torque overload regeneration for60s.

5 7.5 11 15 18.5 22 30 37 45 55

A721 3~ 200V o o o o o o o o o o

A741 3~ 400V o o o o o o o o o o

Capacity in kW

x= to be realesed, o=released in Japan

FR-A701


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Portal Crane Demo Main Screen


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Types of crane models


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Simple component of weight lifter


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The End

Crane Service Syatem

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