I've recently been wondering about the computers in lifts. Do all lifts have a sort of computer, or do some have a different type of system? Who makes the computers or whatever, the manufacturer, or an outside source? When?
Can you tell I'm not in the industry!
2
Lift Electronics/Computers
Started by yan lover14, Apr 05 2013 06:33 PM
2 replies to this topic
#2
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- Industry II
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Posted 05 April 2013 - 06:50 PM
There are a lot of older lifts that utilize plain old relay logic scheme to operate. Wiki
The schematic diagrams for relay logic circuits are often called line diagrams, because the inputs and outputs are essentially drawn in a series of lines. A relay logic circuit is an electrical network consisting of lines, or rungs, in which each line or rung must have continuity to enable the output device. A typical circuit consists of a number of rungs, with each rung controlling an output. This output is controlled by a combination of input or output conditions, such as input switches and control relays. The conditions that represent the inputs are connected in series, parallel, or series-parallel to obtain the logic required to drive the output. The relay logic circuit forms an electrical schematic diagram for the control of input and output devices. Relay logic diagrams represent the physical interconnection of devices. The basic format for relay logic diagrams is as follows:
1. The two vertical lines that connect all devices on the relay logic diagram are labeled L1 and L2. The space between L1 and L2 represents the voltage of the control circuit.
2. Output devices are always connected to L2. Any electrical overloads that are to be included must be shown between the output device and L2; otherwise, the output device must be the last component before L2.
3. Control devices are always shown between L1 and the output device. Control devices may be connected either in series or in parallel with each other.
4. Devices which perform a STOP function are usually connected in series, while devices that perform a START function are connected in parallel.
5. Electrical devices are shown in their normal conditions. An NC contact would be shown as normally closed, and an NO contact would appear as a normally open device. All contacts associated with a device will change state when the device is energized.
Figure 1 shows a typical relay logic diagram. In this circuit, a STOP/START station is used to control two pilot lights. When the START button is pressed, the control relay energizes and its associated contacts change state. The green pilot light is now ON and the red lamp is OFF. When the STOP button is pressed, the contacts return to their resting state, the red pilot light is ON, and the green switches OFF.
Newer lifts use PLC's (Programmable Logic Controller) , which is a solid state programmable controller(Inputs ,outputs)
From Wikipedia
A Programmable Logic Controller, PLC or Programmable Controller is a digital computer used for automation of electromechanical processes, such as control of machinery on factory assembly lines, amusement rides, or light fixtures. The abbreviation "PLC" and the term "Programmable Logic Controller" are registered trademarks of the Allen-Bradley Company (Rockwell Automation).[1] PLCs are used in many industries and machines. Unlike general-purpose computers, the PLC is designed for multiple inputs and output arrangements, extended temperature ranges, immunity to electrical noise, and resistance to vibration and impact. Programs to control machine operation are typically stored in battery-backed-up or non-volatile memory. A PLC is an example of a hard real time system since output results must be produced in response to input conditions within a limited time, otherwise unintended operation will result.
The schematic diagrams for relay logic circuits are often called line diagrams, because the inputs and outputs are essentially drawn in a series of lines. A relay logic circuit is an electrical network consisting of lines, or rungs, in which each line or rung must have continuity to enable the output device. A typical circuit consists of a number of rungs, with each rung controlling an output. This output is controlled by a combination of input or output conditions, such as input switches and control relays. The conditions that represent the inputs are connected in series, parallel, or series-parallel to obtain the logic required to drive the output. The relay logic circuit forms an electrical schematic diagram for the control of input and output devices. Relay logic diagrams represent the physical interconnection of devices. The basic format for relay logic diagrams is as follows:
1. The two vertical lines that connect all devices on the relay logic diagram are labeled L1 and L2. The space between L1 and L2 represents the voltage of the control circuit.
2. Output devices are always connected to L2. Any electrical overloads that are to be included must be shown between the output device and L2; otherwise, the output device must be the last component before L2.
3. Control devices are always shown between L1 and the output device. Control devices may be connected either in series or in parallel with each other.
4. Devices which perform a STOP function are usually connected in series, while devices that perform a START function are connected in parallel.
5. Electrical devices are shown in their normal conditions. An NC contact would be shown as normally closed, and an NO contact would appear as a normally open device. All contacts associated with a device will change state when the device is energized.
Figure 1 shows a typical relay logic diagram. In this circuit, a STOP/START station is used to control two pilot lights. When the START button is pressed, the control relay energizes and its associated contacts change state. The green pilot light is now ON and the red lamp is OFF. When the STOP button is pressed, the contacts return to their resting state, the red pilot light is ON, and the green switches OFF.
Newer lifts use PLC's (Programmable Logic Controller) , which is a solid state programmable controller(Inputs ,outputs)
From Wikipedia
A Programmable Logic Controller, PLC or Programmable Controller is a digital computer used for automation of electromechanical processes, such as control of machinery on factory assembly lines, amusement rides, or light fixtures. The abbreviation "PLC" and the term "Programmable Logic Controller" are registered trademarks of the Allen-Bradley Company (Rockwell Automation).[1] PLCs are used in many industries and machines. Unlike general-purpose computers, the PLC is designed for multiple inputs and output arrangements, extended temperature ranges, immunity to electrical noise, and resistance to vibration and impact. Programs to control machine operation are typically stored in battery-backed-up or non-volatile memory. A PLC is an example of a hard real time system since output results must be produced in response to input conditions within a limited time, otherwise unintended operation will result.
Attached File(s)
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220px-Relay_Logic2.jpg (5.68K)
Number of downloads: 39 -
220px-Siemens_Simatic_S7-416-3.jpg (19.43K)
Number of downloads: 43
This post has been edited by aug: 05 April 2013 - 06:53 PM
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#3
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- Industry II
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Established User
Posted 06 April 2013 - 01:58 AM
Newer lifts have two computers: one that works real-time doing the driving of the lift and monitoring all sensors and transducers - that's the PLC that user aug wrote about. It's not a user-oriented machine. It's about hardware inputs and outputs, the decision making is internal, super-fast (most safety functions run in there) and not easily modifiable. Basically it's a collection of small boxes mounted on DIN rails (or on a larger backplane) inside the electrical cabinet, with LEDs showing the status of input and output sginals. Some makers of PLCs: Pilz, Siemens, GE, Allen Bradley. The other computer is one tasked with interfacing the PLC to the user. Doppelmayr uses a Windows CE (Windows Mobile)-equipped touchscreen computer (built in the electrical cabinet door). Leitner, the other great lift manufacturer, usually employs a regular PC running Windows XP or the like, complete with keyboard, main unit and classic LCD monitor. These user-oriented computers show the status of the lift (running speed, direction, instantaneous power consumption, causes of stops etc) and some sensors data (wind speed, direction, forces in the rope tensioning system etc), all in intuitive graphic formats.
Attached File(s)
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Doppelmayr PILZ PLC.jpg (188.99K)
Number of downloads: 83 -
Doppelmayr Windows CE touchscreen computer.jpg (145.09K)
Number of downloads: 86
This post has been edited by Razvan: 06 April 2013 - 02:09 AM
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