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Elevator control panel2/25/2023 ![]() ![]() VVVF systems are more beneficial than the systems using throttling control of fluid flow, like in systems with pumps or fans. This type of Inverter Elevators have become popular with advanced technology and they replaced manually-controlled or dual-speed operation elevators. VVVF (Variable Voltage Variable Frequency) drivers or known with other names as VFD (Variable-Frequency Drive), AFD (Adjustable Frequency Drive), VSD (Variable Speed Drive) are a type of new technology adjustable-speed drive to control an elevator speed by changing motor input frequency and voltage. Some of the types and specialties of the elevator control panels are below: Programs of optimizing and controlling the operations of the elements.Įlevator control panel design can differ according to needs.Input, output, and communication programs,.Typical control software of an elevator includes: The parts or the components of the elevator communicate with each other by using Control Area Network (CAN). With the help of advanced microprocessor technology, elevator control panel parts control the elevator operations. It can be placed at the hoistway or the machine room above the shaft. Elevator Control PanelsĮlevator control panel location is an important issue that is improved with the technology. Other functions like registering or canceling the car calls, door control, measurement of the carload, and the speed are handled by the elevator control panels. The elevator control panel holds all the power supply units, orchestrates all the operations, and ensures safety. An elevator controlleris a system to control the elevators and the elevator control panel is a cabin that holds all of the components to control the elevator. And in the 1980s, with new developments, microprocessors are introduced to elevator controls. The first electrical controls were started to be used by relay techniques which are the same as telephones in the 1970s. ![]() After the 1950’s, hydraulic and ram elevators in which oil is used instead of steam returned because it was cheaper to put the machine room at the bottom of the building. In electric elevators, the mechanisms were used to install above the elevator hoistway in a machine room. The elevators were using hydraulic systems until the electric power utilization in the 1880s with the result of geared or gearless traction elevators replacing the hydraulic ones. Following this discovery, the first elevator was installed in 1857, and elevators started to become an important part of daily life. Steam and hydraulic elevators had already been used but they were not safe until the discovery of the clutch in 1852 by Elisha Otis. Once there, click on the “free access” tab and select the applicable year of NFPA 70 (National Electrical code).Elevator Control Panel, The Brain of LiftsĮlevators are being used throughout human history, but modern elevator history is not older than 150 years. See the actual NEC text at NFPA.ORG for the complete code section. Elevator control panels shall not be installed where the available short-circuit current exceeds the SCCR of the control panel, as marked in accordance with 620.16(A). In the 2017 NEC, Section 620.16(B) has similar language to what is found in 409.22 for industrial control panels. The city inspector will generally not have a copy of the standard in order to know what Supplement SB actually says. The informational note mentions Supplement SB in UL 508A as an example of an “approved” method. The inspector may or may not want to be responsible for allowing item 2 above since it leaves liability in the hands of the inspection agency. NEC Article 100 defines the term “ Approved” as “ Acceptable to the authority having jurisdiction” (the inspector). ![]() ![]() Determine the SCCR of the elevator control panel using an approved method and mark it on the control panel.Use a listed and labeled elevator control panel assembly that will already be marked with the SCCR as part of the product listing requirement.There are two methods permitted in 620.16 for the required SCCR marking: In the 2017 NEC, Section 620.16(A) requires the short-circuit current rating (SCCR) to be marked on elevator control panels. ![]()
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