Weak current College】 【automatic escalator energy saving programmes on.

Escalators and passenger conveyors at hotels, Department stores, subway, train stations, Office, Club, airport and other places in the application more user-friendly and increasing the quality of service has played a very important role. But because of the particularity of their applications, part of the ladder is in idle state frequently, this will waste a lot of power, but also make ladder parts (such as the motor, gearbox, handrail, etc.) produce unnecessary wear and fatigue damage. At present the major escalator to hydraulic coupling speed or constant speed. But because the industrial field, use and maintenance of many problems, it is often necessary to maintain, low efficiency. Often, such as fault causing downtime-rotor, and even burnt motor. With power electronics and computer technology, AC motor frequency technology for reliable and durable, automation, control and feature-rich and so improves operating reliability and control precision, fully integrated protection, energy saving effect is good, simple control interface and rich, with computer communications interface, you can easily and microcomputer control system or process control systems, with the support of the software can be further upgraded to computer monitoring without the need for additional hardware investment. Current frequency conversion technology has been widely used in domestic metallurgy, coal, electricity, machinery, chemical industry, etc.
Operating principle
We know that, due to energy and electricity resources are scarce, the escalators in the unladen state running a huge waste. Therefore, we imagine, if you can let the escalator automatically detect idle state for a period of time, the directive escalator by speed reducer to half-speed operation. In access relatively frequently, based on the above thoughts, escalator detects idle state for a period of time, will be at full speed gradually slow down until you stop running to achievement of save power up to 30% to 50%. When the passengers on the escalator bed cover, ladder can be set in the bed cover entrance photoelectric sensing device auto-sensing passengers coming, start at full speed.
Automatic escalator energy saving case
1. reconstruction principles
In the normal use of no escalator have any negative impact of the introduction of sensorless vector inverter concepts. That is, converter according to the sensor signals, when someone take the escalator to the original design, speed; when no one ride, escalator slow down or stop running.
2. the role of the inverter
Main role is used to adjust the escalator speed, starting and running smoothly, without delay, after which the system automatically transferred to crawl operation, to achieve the purpose of energy saving. The escalator entrance install photoelectric switch, passengers photoelectric switch signals, ladder with variable speed-rated speed, when all passengers leaving escalator, escalator and automatically enter the low-speed operation status. Save energy, reduce mechanical wear, long life.
Transducer selection
System requirements for running a smooth start, no jitter, inverter starting torque, acceleration capability. KV2000 converter can provide adequate output torque and overload ability, speed adjustment and high precision, in open-loop velocity error can achieve < 0.5% torque response time short < 10ms.
Fully able to meet the requirements of the system.
Choose KV2000 sensorless vector inverter that can meet these requirements.
Electrical system
KV2000 sensorless vector converter is powerful, we take advantage of built-in features to TMIA system automatically detects, PLC's Refresh function, reduce the cost of acquisition and PLC programming workload.
When any one number KV2000 input terminals Xn is specified when TMIA function can select Y1 and Y2 or TA, TC, as the output function TMOA; plus contains timing (/count) module will constitute a delay disconnect relay. The duration of the delay by F071 decision.
When you enter TMIAON, output TMOA also immediately ON. But when after TMOA TMIAOFF must go through the definition of time F071 to OFF.
FWD
Y1
X1
COM
Signal detection
KV2000 Inverter control circuit
KV2000 contains timing (/count) functionality. When digital input terminals x 2 and 28 X4 selection mode, the timing (/count)-must be used at the counter using; or as a timer.
Fully automatic timing KV2000 converter features
System features
1, the speed of the wide, integrated energy-saving effect is good. Compared with traditional power save 10-30%.
2, a high degree of automation, application-rich and flexible. Strong object-oriented project programmability, depending on the size of the passenger traffic automatically adjust the motor speed.
3, reduce mechanical wear, reduced the amount of maintenance. Frequency converter with automatic soft-start function, reduces the start impulse current.
4. power capacity reduced escalator sometimes to multiple machines at the start, when the power supply capacity is insufficient to be considered when starting out in sequence. Use of frequency converters, low frequency (3HZ) starting, so even with the inverter capacity equivalent to more than one machine at the start, the starting current or inhibited. Therefore, power capacity can be considered by the inverter capacity. Compared with the use of frequency power, capacity can be reduced.
5. protection of the full-featured, secure, reliable, and durable.
With overvoltage, overcurrent, less voltage, overload, motor over-temperature, short circuit, phase, stalling (unique feature), automatic protection function and automatic retry transfer function, reduce unplanned outages and downtime. And automatically displays the cause of the failure.
6, technical data:
Overvoltage trip: 1.3Vmax
Undervoltage tripping: 0.65Vn
Start the transformationTorque: 200%, Tn
Overload capacity: 150% 1min
Motor stalling: programmable auto-tuning, adjustable
7, with nine group switch quantity input that can be used as start and stop, chain protection conditions special requirements of the control. A group of relay output, 4-ch transistor output can control chain protection, fault display, running, etc.
8, automatic optimization of electric current.
9, frequency set with manual and automatic.
10, converter comes with DC reactor, power can be increased to 0.98.
Escalators running characteristics of frequency
According to a supermarket is located in Shenzhen City of many foreign brands more than the escalator of frequency energy reliability test results of the validation of the technology innovation with powerful, workload, and other advantages.
1. no one staircase stairs automatically when: to ensure a smooth transition to energy efficiency, to 1/5 rated speed. (You can select when no one escalator, escalator auto stop function);
2. when someone by ladder: guarantee automatic escalator to energy speed smooth transition to the rated speed, the actual measurement is verified;
3, escalator no-load speed mode to energy saving, current only no-load rated speed run current of 1/3.
4. maintenance run-time: ladder system with 1/2 rated speed, ease of maintenance and observation of kinematic escalator, to avoid the original system rated speed to move the stop does not timely.
5, because no one staircase time and energy running speed is very low wear of mechanical parts, dramatically reducing the relative extension ladder of life.
6, the use of inverter technology significantly reduces the ladder starts on the power grid, adopt inverter can effectively improve the power grid of power factor, reduce reactive power consumption.
7, reconstruction takes into full consideration frequency conversion system and the system of coexistence, easy to switch between a system failure will not affect the user's use.
8, reconstruction borrowed the original system of security conditions, coupled with the inverter itself links allows modification of the system security and more reliable.
9, escalator energy saving equipment cost and energy savings and the cost of mechanical wear, inputs, and a payback within a short period of time, so the escalator safety improvement of frequency conversion technology development with successful, for improving the existing ladder safety and energy saving, has significant economic and social benefits.
Closing remarks
1, power save obvious: the escalator motor load is constant torque load, because no one escalator motor speed reduced to half the normal speed, so that power reduced to half.
2, reduce the wear due to the decline, the rotational speed of machinery parts wear significantly decreased and doubly reduced escalator maintenance costs.
3, safe and reliable: due to the use of KV2000 high performance frequency converter, in addition to motor protection, motor speed reduction due to a significant reduction in the motor temperature rise, the motor of a more secure and reliable.