There are some applications where the conductor bar may not be insulated, but the most common types have insulated covers. Today, most conductor bar electrification systems are insulated with a cover. A conductor bar uses a sliding shoe collector system, which removes most of the exposed conductor safety hazards and can supply higher amperage power compared to other power systems.
#ST CONNECTOR SPLICE BARS FULL#
Multiple conductor power cable is wrapped around a drum, which rotates to payout or retract the necessary length of cable for the application.ĭisconnect – device where the conductors of a circuit can be disconnected from their power sourceĮxplosion proof – electrical specification that includes a variety of components that must be supplied as per the demands of the Group, Class, and Division of the hazardous area in which they are expected to operateįestoon stack-up – When the cables gather together at the end of a rail, it can limit the travel of the components causing the crane or trolley to stop short of it’s full range of travel How an Electric Overhead Crane Receives PowerĬomponents of a conductor bar crane electrification system.Ĭonductor bars (also referred to as power bars, figure eight bars or hot bars) are one of the most common methods of electrifying and supplying power to a crane and hoist. Mainline collectors are mounted on the bridge to transmit current from the runway conductors, and the trolley collectors are mounted on the trolley to transmit current from the bridge conductors.Ĭontroller – device for regulating the power delivered to the motor or other equipmentįestoon cables – looped wires, or more commonly flat cable, that carry power and control across a bridge or along a runway or monorailĬable reels – also known as electrical cord or power reels, these are one of several alternatives for providing power to electric hoists. Runway conductors – main conductors mounted on, or parallel to, the runway which supplies current to the craneĮnclosed conductors – a conductor or group of conductors substantially enclosed to prevent accidental contactĬollectors – contacting devices for collecting current from the runway or bridge conductors. Mainline conductors – rigid construction bars, cable festoon system, or cable reel that delivers the mainline power along a runway or monorail trackīridge conductors – electrical conductors located along the bridge structure of a crane to provide power to the trolley and hoist For safety reasons, the control circuit operates at a lower voltage and current to reduce the shock hazard to the operator. The crane and hoist are run by a push button type control or radio remote used by the operator. Power circuit – provides energy to lift loads and run the motors that perform workĬontrol circuit – supplies power and includes circuitry to activate the devices that turn the main motors off and on. It consists of a movable bridge carrying a fixed or movable hoist mechanism and travels on an overhead runway structure. This cable reel is powering a below-the-hook magnetic lifting device.īefore we jump into the different types of electrification options for overhead cranes, let’s look at some definitions for terms that may be used throughout this article:Įlectric overhead traveling crane – electrically operated machine for lifting, lowering and transporting loads. Glossary of Terms Related to Overhead Crane ElectrificationĪ cable reel system (shown here), can be spring-driven or motorized to payout, retrieve, and store multi-conductor power cable. Identify what types of crane applications or environments each electrification system may be best suited for.
Discuss the advantages and disadvantages of each crane electrification system.Explain how each crane electrification system works and lay out the different options available for each system.Breakdown and explain the three main types of overhead crane electrification:.Define terms related to overhead crane electrification.With different types of electrification systems available, and different varieties that exist for each type of system, it can be difficult to determine which electrification method is best for powering your overhead crane. There are three main types of overhead crane electrification: conductor bars, festoon systems (shown here), and cable reels.Īdmittedly, overhead crane electrification can be one of the more complex subject matters.
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