【 Weak current College 】 elevator energy saving solutions

First, the leading elevator energy-saving technology

Elevator now more and more, hotels, office buildings, electricity consumption survey, the electricity consumption of total electricity consumption of the elevator's 17%-25%, second only to the air conditioning energy consumption, higher than the lighting, electricity supply, etc.

1.1 trends

At present there are already abroad elevator "energy" and "back-of-the-art" second, customers in a new buying elevator, select the "feedback" in proportion to the growing number of elevators.

1.2 energy-saving effect

Power-saving effect and lift, the lift the entire system, Elevator balance system, and so on, the following categories of energy-saving effect better:

① the higher floor elevator, brake frequently, more energy saving;

② newer installation of Elevator, large mechanical inertia, the more energy saving;

③ use longer elevator, friction, more energy saving;

④ faster elevators, braking, saving more frequently;

⑤ the more frequent use of Elevator, braking, saving more frequently.

1.3 security, high-quality, fully intelligent

The use of advanced power electronics technology, quality and reliable security, smart operation, easy to do without a customer.

More perfect after-sale warranty service for customers to solve all problems. One-year warranty, life-long maintenance.

Second, the principle outlined-elevator products application of energy-saving technology

With modern production scale is continually expanding and constantly improving people's living standards, increasing power demand contradiction, rising electricity saving voice. The statistical data shows that motor dragging Load consumes the total electricity consumption of more than 70%. Therefore, the motor drive system saving energy has a particularly important social significance and economic benefits.

Motor drive system saving energy means there aretwo broad categories:

A class is to improve motor drive system operating efficiency, such as fan, pump speed control is to increase the load on the operating efficiency of energy saving measures, such as elevator traction machine adopts frequency converter instead of asynchronous motor voltage speed control is to improve the efficiency of the motor run to the goal of energy conservation measures.

Second type is the movement of mechanical energy payload (potential energy and kinetic energy) through energy feedback for transformation into electric energy (renewable energy) and back to AC power grid for near other electrical devices used to make motor drive system in unit time consumption power decline, so as to achieve the purpose of saving power.

The following example to lift the elevator on the second type of energy saving principles:

Adopt frequency conversion speed elevator starts running maximum operating speed with maximum mechanical features, Elevator reaches target layer to gradually slow down until the lift stop motion, this process is the elevator traction release of mechanical functions. In addition, lifting the elevator was a bit to load, to drag the load evenly, Elevator by tractor dragging load by passenger car and counterweight balancing block, only when a car load of about 50% (1 ton passenger elevator passengers to 7 people), the car and on balance block each other balance, otherwise, the cabin and on balance block will have poor quality, the elevator runs to produce mechanical energy.

The elevator runs extra mechanical energy (including potential energy and kinetic energy) through the motor and frequency inverter converts DC-DC converter can be stored in a circuit capacitance, capacitance is like a small reservoir, ECHO to power capacitors, capacitor, the higher the voltage, (like the reservoir water level ultra), if not timely release of capacitors stored power will produce overstress failure so that the inverter stopped working, the elevator is not working properly.

At present, the vast majority of vvvf lift are stored in the capacitor resistance consumption of electric energy to prevent capacitive voltage, resistance and energy consumption not only reduces the efficiency of the system, the thermal resistance of a large number also worsened the elevator control cabinet the surrounding environment.

The role of energy feedback device is to be effective will be stored in the capacitor power back to AC power grid for the surrounding the use of other electrical equipment, energy-saving effect is very obvious, General-saving rate of up to 21%-46%. In addition, because no resistance heating element, the room temperature drops, you can save the power consumption of the engine room air conditioning, on many occasions, saving air conditioning electricity consumption tends to bring greater power saving effect.

New energy feedback and at home and abroad other than energy feedback is one of the most major characteristic is a voltage self-adaptive control feedback function.

General energy feedback devices are based on inverter DC circuit voltage UPN's size to decide whether to give back to the power, voltage feedback using a fixed value UHK. Due to fluctuations in voltage, UHK value offset hours in line voltage too high will produce incorrect return value too large; UHK, feedback effect obvious decline (capacitor energy storage is resistance in early consumption).

New energy feedback device adopts voltage self-adaptive control, that is, no matter how the grid voltage fluctuations, only when the elevator mechanical energy is converted into electrical energy into DC circuit capacitance, new energy feedback device is promptly capacitor energy storage back in, an effective solution to power the existing energy feedback.

In addition, new energy feedback is a very complete protection functions and extensions, you can use revamping of existing elevator,also applies to the new elevator controller. New elevator control cabinet using new energy feedback-fed, not only to significantly save energy, but also can effectively improve the quality of the input current, achieve higher potential compatibility standards.

New energy feedback for applicable voltage range, 220VAC, 380VAC, 660VAC 480VAC, etc.BR>
III. product life

According to the detection products reliably achieve 70000 hours. The elevator, 365 days a year, 24 hours a day, keeps running, energy feedback can be used continuously for more than 8-10 years.

Since the lift has a State of the waiting or standby, he does not like a light bulb, is in a State of long-term work. Feedback may work 10 hours a day is used a lot. According to this calculation, the feedback is more than one elevator service life. But the elevator has a lot of mechanical components are time-limited. Thus, in life, one in return for the service life than elevator is much longer.