What is an elevator callback?

A callback is reported when maintenance needs to repair the elevator systems beyond their routine checks. University records show the cause of elevator breakdowns is most often a result of passenger-inflicted damage.

What does 2 1 roping mean?

A rope ratio of 2:1 leads to the lift car travelling at a speed one half of the speed of the rope. Although it isn’t very common, rope ratios greater than 2:1 do exist.

What is elevator maintenance?

Part of maintenance means making sure the elevator machine room is self-closing and locking so no one without authorization can gain access, the room features adequate lighting, and the room is not being used for storage, which is a fire hazard. Elevator units should be in top working order.

How many types of roping are there in an elevator?

Types of Roping Systems. There are many types of roping systems (Figure 1). Types (a), (b), (c) and (e) are most common. The most popular type that can explain the operation of a typical traction elevator is type (a), usually for high-speed elevators.

What is a 2 1 pulley system?

The directional or redirect pulley (pulley B) supports half of the weight of the load (50kg) on one side but an effort of 50kg is being applied on the other side to raise the load, so pulley B and its anchor are actually being loaded with 100kg. …

What is suspension rope elevator?

A rope suspension apparatus for an elevator system, includes a bed, a motor 1 attached to the bed, a motor shaft 2, a traction sheave 4 so mounted on the shaft that the ends of the traction sheave are inclined at an angle relative to vertical, and at least one diverter pulley 5, such that at least one suspension rope …

What is traction sheave?

Traction elevators (also known as Electric elevators) are the most common type of elevators. Elevator cars are pulled up by means of rolling steel ropes over a deeply grooved pulley, commonly called a sheave in the industry. The weight of the car is balanced by a counterweight since 1900.

What is a 3 1 pulley ratio?

An easy way to calculate the ratio of a pulley system is to count the amount of lines that apply effort on the load. In this system there are three ropes that exert effort on to a load of 90kg, so each rope is supporting 1/3 of the loads weight (30kg).