Elevator malfunctions and repair of elevator electronics

Main causes of elevator malfunction

Malfunctions and malfunctions in the operation of elevators and elevator equipment occur for various reasons, the main ones being:

- Parts wear

- Accidental damage to parts and assemblies of the elevator

- Imperfect elevator design

- Poor workmanship of elevator and elevator parts

- Poor installation of elevator equipment

- Low quality of elevator maintenance

- Inconsistency of individual components with the actual mode of operation.

In the process of elevator operation it is necessary to timely and quickly identify the causes of malfunction of elevator equipment and eliminate them.

Faults in which the elevator must be stopped until the faults are corrected

- A loaded cab comes into motion with the shaft door open or cabs with the shaft door open.

- Automatically operated cab doors open when moving or between floors.

- When the call button is pressed, the loaded cab moves, but the empty cab does not.

- The cab is self-propelled.

- When the order buttons are pressed, the automatic doors do not close or open when the order is executed.

- The cab moves down or vice versa instead of moving up.

- The accuracy of the automatic cab stop exceeds the standard value.

- The cabin does not stop at the landing site to which it is called or directed by order.

- The shaft door can be opened when there is no cab on the landing pad without using a special key.

- The cab does not stop when the "Stop" button is pressed.

- On the elevators connected to the control panel, two-way intercom does not work or signals from the elevator to the operator's console. The alarm system from the cabin and the attendant call (for freight and hospital elevators) does not work.

- When the elevator is operating, there are extraneous noises, sudden jolts, and a smell of burning.

- The cabin or areas in front of the shaft doors are not illuminated.

- The cab or shaft guard is damaged.

- The glass of the inspection window in the shaft or cabin door is broken.

- The pushers of push-button elements of call or order devices are missing or broken, and there is access to bare live parts of electrical equipment.

- The metal structures of the shaft or apparatus enclosures are energized.

All elevator malfunctions can be divided into failures related to electronics or electrical part and mechanical part of elevator equipment. In this article we will consider the repair of elevator electronics.

Elevator malfunctions related to electrics and electrical equipment and their causes

Failure: The cabin (with a passenger) spontaneously walks up to any floor

Possible cause: Open circuit of the common wire of the push-button unit. Jamming of the floor relay to which the cab is spontaneously traveling.

Fault: The automatic circuit breaker fails when the switch is switched on

Possible cause: Short circuit in the transformer windings or in the power circuit

Failure: When pressing the call button for the floor where the empty elevator car is located, the button sticks, but the doors do not open

Possible cause: Faulty relay circuit, faulty relay coil, open circuit in relay coil

Failure: When pressing one of the order buttons, the button sticks, the others work properly

Possible cause: The electric circuit of the order button of this floor is defective. Breakdown or open circuit in the coil of the order button of the given floor

Fault: Elevator car moves when the car and shaft doors are open

Possible cause: Defective relay, defective locking contacts of the shaft and cabin doors

Fault: Elevator car passes a given stop at low speed, stopping at the next stop

Possible cause: The gap between the sensor and the shunt on this floor is larger than normal.

Fault: Cabin lighting lamps not illuminated

Possible cause: Cabin light bulbs burned out. The contacts are not switched on

Fault: Fuses blow when the main switch is switched on

Possible cause: Short circuit in transformer windings or wires

Fault: Cabin emergency lighting lamps not illuminated

Possible cause: Emergency light bulbs burned out No voltage at the terminals

Fault: Automatic door actuator does not work

Possible cause: Motor failure, belt breakage or loose cam fasteners

Fault: Elevator does not move when starting up

Possible cause: No voltage on the line

Of course, the list of possible faults can be extended indefinitely. All spare parts related to the electrical part can be conditionally divided into repairable and those requiring unconditional replacement.

There are expensive electronics components in elevators that are much more cost effective to repair instead of outright replacement, these include:

- Frequency converters

- Servo drives and servomotors

- Starting devices

- Control boards

- Power supplies

- Voltage stabilizers

- Operator panels

- PLC controllers

- Control stations

- UPS

Repair of elevator electronics

Elevator equipment is very technological, it consists of electronic and mechanical parts. All mechanical part of the elevator system is controlled and monitored by electronics. But, like any electronics, control boards and other electronic blocks of the elevator system are very susceptible to voltage fluctuations and poor quality power supply. Failure of even one electronic unit of the elevator system can lead to a complete stop of the elevator and, accordingly, to termination of operation.

Electronic control and safety units of the elevator are very expensive equipment and in case of its failure it is necessary to perform its replacement. Performing such works requires professionalism and experience.

Electronic control units are most often delivered under the order, which entails long downtime of elevator equipment. One of the options to solve the problem is to perform component repair of elevator electronics.

Component repair of elevator electronics

As before any repair, in case of repair of elevator electronics, it is required to perform a complete diagnosis of the elevator system unit. The specialist, who performs repair, disassembles the unit, cleans it from dust and dirt. By means of the special diagnostic equipment the detailed diagnostics of all components of the electronic block is carried out. This process requires great care, knowledge and experience in working with elevator equipment of different manufacturers. The identified faulty component or group of components is dismantled and new ones are installed in their place. At such repair it is very important to observe full compatibility of new components, because installation of unsuitable component can lead to complete failure of the whole unit. It is best to entrust such repairs to specialists who have extensive experience.

Ece Elevator recommends to entrust your repair only to specialized companies, connected with the elevator market and having extensive experience in repair of elevator equipment. One of such companies is an expert of the elevator electronics market - "Ece Elevator".

Experts of the company "Ece Elevator", performs field diagnostics and repair of elevator and lifting equipment of any manufacturer. We repair electronic components of elevators:

- Frequency converters

- Servo drives and servomotors

- Starting devices

- Control boards

- Power supplies

- Voltage stabilizers

- Operator panels

- PLC controllers

- Control stations

- Industrial UPS

Employees of "Ece Elevator" are ready in the shortest possible time to perform repair and adjustment of electronic components of the elevator, which will minimize the downtime of its elevator. The company has at its disposal modern equipment for diagnostics, competent specialists and availability of spare parts necessary for repair works.

In addition to repairing the electronic part of the unit, its mechanical components are replaced: oil seals, gaskets, bearings, etc. EIT Service" company works with equipment of well-known, trustworthy brands.