26

Glossary of Common Crane Terms:

Adjustable brakes:Electro-mechanicaldevicetocontrol

horizontalcranedeceleration.

Bridge beam:Travelingbeamconnectedtoendtrucks-

supportstrolleyhoistandload.

Bumpers:Energyabsorbingdevicemountedonend

trucksortrolleythatreducesimpactwhenthetruckortrolley

contactseitheritsendstoporanothertruckortrolley.

ElectronicSoftStart.

End truck:Load-bearingcranecomponentthatsupportsthe

bridgebeamandconsistsofaframe,wheels,axles,etc.

Festooning:Wiringandsupportsystemthatdeliverspowerto

trolleyhoistacrossbridgeorrunwaybeam.

Compliance

• Thermalprotectionforallmotors.

wheelrunningsurface.

andload.CommonlyfabricatedfromSorWbeamsor

Runway electrification:Deliverspowertocraneasittravels

alongrunway.

System max wheel load:Maximumloadexertedonrunway

beamsforacraneloadedtoitsratedcapacity.Itoccurswhen

Top running:Cranetypethattravelsontopofrailorbar

attachedtorunwaybeams.

Underhung:Cranetypethattravelsonthelowerflangeof

27

• TheCraneManufacturersAssociationofAmerica(CMAA)hasestablishedsixserviceclasses

forcranes.TheseclassesareClassAthroughClassF,andarebasedonloadcyclesand

loadmagnitude.ClassAcranesaresuitedfortheleastsevereservice,andClassFcranesare

lifeis100,000to500,000cycles.

• Loadisusuallyverylightandrarelyisequaltoratedcapacity,anddesignservicelifeis

500,000to2,000,000cycles.

TheloadcycleandmagnitudecombinationsthatdefinetheClassBServiceClassare:

• Loadisusually1/3ofratedcapacityandisrarelyequaltoratedcapacity,anddesignservice

lifeis20,000to100,000cycles.

• Loadisusuallyverylightandrarelyisequaltoratedcapacity,anddesignservicelifeis

200,000to500,000cycles.

28

Bridge Crane Control Panels

provides bridge crane

forward and reverse control

29

Lock-outcompatiblethrough-the-doormanualdisconnectswitchwithsystemfusing,110voltcontrolcircuittransformerwith

primaryandsecondaryfusing,mainlinecontactor,VariableFrequencyDrive(VFD),brakerelay,branchcircuitfusingforbridge,

auto-resetthermaloverloadrelay,andbottomhingeddoor.

Thesepanelscanbeusedfordualandmultiplespeedapplications,infinitelyvariablespeedapplicationsandprogrammed

acceleration/decelerationcontrol.VFDcomespre-loadedwithmanyeasy-to-selectprogramstofitvirtuallyanycranecontrol

4 = NEMA 4

1

Model

2

30

31

32

33

34

Options

• Infinitelyvariablespeeds

• Programmableaccelerationanddeceleration

• Radio

• Infrared

• Wall-mountedpendant(hard-wired)

(NEMA1isstandard)

(31/4"andabove)