Types of Elevator Switches

elevator switch

An elevator switch is an electrical device that controls the movement of the elevator. They are available in a variety of specifications. A common type of elevator switch is a pit switch. There are several types available, including limit switches, permanent magnet inductors, bi-stable, and combination of two limit switches. To select the correct switch for your needs, consult an electrician or mechanical engineer.

Limit switch

The Limit switch on an elevator switch is a safety device that detects a set amount of movement in an elevator. Limit switches are usually required in elevator systems by building codes. Their main purpose is to detect the operational state of an elevator and to protect people from injury. These switches can withstand hundreds of thousands of cycles.

A limit switch is a simple electromechanical device. It works by closing or opening a contact within the switch. A spring then pushes the lever back to its initial position. It is mechanically similar to a light switch. The critical parameter is the position at which it closes its contact, which varies by brand and type. This factor influences the design of the entire system.

When the limit switch is in its active state, the elevator will not run. It is best to check the position of the limit switch before using it. If it is in the active position, the resistance will be high. If it is in the inactive position, the resistance will be low. The switch should transition from one position to the other smoothly.

There are different types of limit switches for different elevators. The first one controls movement in the elevator. It converts a mechanical signal into an electric signal. When a car passes a particular distance from the end position, the limit switch on the elevator switch is closed. The limit switch is designed to prevent movement only when the car is in the distance range.

A limit switch on an elevator switch prevents the elevator from going further than the upper and lower limits. The upper limit switch prevents upward movement while the lower limit switch prevents downward movement.

Permanent magnet inductor switch

The working principle of the Permanent magnet elevator switch is that the magnetic field produced by a permanent magnet is directed toward the magnetizable plate. The magnetizable plate is attached to the inductor switch mechanism through an opening in the housing. The inductor is then mounted on the magnetizable plate, which includes permanent magnet bars that are clamped onto brackets 4. The magnetizable plate is surrounded by pole pieces that pivot on the magnets.

The permanent magnet inductor elevator switch is a high-performance elevator switch that is suitable for elevator applications. It consists of a magnet and a magnetizable plate that are connected by a linkage. The magnetizable plate is mounted at the end of the inductor and arranged so that the pole pieces are pivotally mounted at either end. The inductor is oriented in accordance with the direction of the magnetic field when it is just beyond the edge of the magnetizable plate.

A permanent magnet elevator switch operates in a similar manner to a toggle switch. It is mounted in four positions per elevator car, two of which control the final leveling position and two others control the changeover from fast approach to slow approach speeds. These four switches are identical. The final leveling position switch, however, is required to have superior operating characteristics.

The magnetic inductor elevator switch works by utilizing a U-shaped magnet. The poles are parallel to the path of the magnetic flux and are located close to the armature. Because of this, the magnets must be arranged in a manner that minimizes their angular movements. A typical elevator switch has an armature and a pole piece. These two parts are joined together by a linkage.

Bi-stable switch

Bi-stable elevator switch is an electronic magnetic control for elevator. It is disclosed in utility model for elevator floor reaching. It is an improvement over traditional mechanical elevator switch. It is also used to operate elevator doors. It can be operated from remote control. Using this type of elevator switch can save the time and energy.

Bi-stable elevator switch uses two independent stable states. The first one is activated by one of the elevator magnets and the other by the opposite pole. It can prevent entrapment in an elevator in case of power failure. However, it can’t reduce the power consumption. But it can prevent perils during power failure by shutting down the elevator.

The bistable magnetic switch is also disclosed in utility model. This switch can be arranged in a small space. Its compact structure improves switching safety and reliability. It also reduces noise and vibration. Despite these advantages, the bistable elevator switch is still relatively expensive. The utility model uses a reed pipe sleeved with an annular magnet as a relay.

Combination of two limit switches

Combination of two limit switches on elevator switch protects the elevator from overtraveling. These switches form part of the power line supplying the drive system. When a car reaches the specified distance range from the end position, it is not allowed to move further. A safety brake 42 is installed after the limit switch to prevent the car from going any further.

The switch has two positions – up and down. The up side of the switch is connected to the upper limit switch, while the down side is connected to the lower limit switch. The combination of two limit switches is known as a dual limit switch. If a user presses the up button, the upper limit switch closes and the down switch opens.

In the case of a single elevator, the combination of two limit switches can prevent overtraveling by limiting the speed. In the event that the elevator cannot return to the designated floor in thirty seconds, it will be automatically bypassed and another elevator will start and return. This cycle is repeated until all elevators have returned to their designated floors.

Working spaces defined by stopping elements

The stopping elements of elevator switch are critical components of the elevator system. These components are used to prevent the driving machine from operating if a person is working on it. These stopping elements can be manually operated or installed in close proximity to the equipment. In the case of elevators with a remote driving machine, another means of disconnecting is required. This second disconnecting means must be able to open all ungrounded conductors and be capable of locking in the open position.

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