Application of yingweiteng integrated energy-savin

2022-08-09
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The application of inveterate integrated energy-saving cabinet on escalators

this paper describes the energy-saving transformation scheme of using inveterate chv110 integrated energy-saving cabinet (vector control technology) on escalators

1. Introduction

with the rapid development of urban real estate construction industry, the installation and utilization rate of elevators is getting higher and higher. According to statistics, at present, the number of elevators in use nationwide has reached more than 500000, and the annual power consumption has exceeded 30billion kwh. Therefore, how to adopt efficient and energy-saving elevator control technology has become a topic of great concern to elevator merchants and users

at present, most escalators installed in China use single speed AC motor as the main engine, sprocket chain drive, and the rated speed of the steps is mostly 0.5m/s. This kind of escalator runs at the rated speed even when there are no passengers. It has the disadvantages of high energy consumption, serious mechanical wear and tear, and low service life. The following will put forward specific energy-saving solutions for the shortcomings of this kind of elevator

2. Energy saving transformation scheme of full escalator

2.1 transformation principle

on the premise of not having any negative impact on the normal use of escalator, the concept of sensorless vector variable frequency speed regulation from no speed to 2018 is introduced. That is, the frequency converter operates at the original speed (50Hz) when someone is riding according to the signal generated by the sensor; When there is no one, the escalator slows down to low speed or stops running

the system requires the frequency converter to start and run smoothly, with good acceleration performance, large starting torque and strong overload capacity. At the same time, it should have the ability to automatically switch the control system to power frequency operation when the frequency converter speed regulation system fails, so as to ensure the normal implementation of the escalator conveying function. Therefore, the chv110 series integrated energy-saving cabinet (dedicated for escalator) of vector control technology of Shenzhen yingweiteng Electric Co., Ltd. is selected. The control cabinet is internally designed with industrial/frequency conversion switching. At the same time, the special control function module of escalator energy-saving operation is integrated, which is convenient for users

2.2 power saving principle

for passenger escalators, the peak use period generally occurs in the afternoon and evening, and the utilization rate in the rest of the period is low, which has considerable energy-saving space. According to the above transformation principles, considering the investment cost and automation level, it is proposed to use the following variable-frequency drive scheme:

· NVIDIA chv110 integrated variable-frequency energy-saving cabinet (dedicated for escalator) is used to drive the elevator host, the frequency converter adopts multi-stage speed control mode, and sets two operating frequencies: main frequency (low speed) and multi-stage speed frequency 1 (high speed)

· install an infrared sensor switch at the head and tail of the elevator. When passengers pass the elevator, the infrared sensor switch is triggered and sends a switch signal to the frequency converter

· when there is passenger flow, the infrared sensor switch is triggered, the frequency converter immediately accelerates to multi-stage speed frequency 2, and makes the elevator run at high speed

· when the elevator is running at high speed, the built-in timer of the frequency converter starts timing. If no passengers pass the elevator within the timing period, the frequency converter will automatically switch to multi-stage speed frequency 1 for low-speed operation after the timing is over

· if a passenger triggers the photoelectric switch again during the timer, the timer will be timed again

· for the elevator up and down, the peripheral control adopts switch interlocking to ensure the normal operation of the escalator system

· in order to consume the downlink or the excess energy generated in the braking process, it is necessary to install a braking resistor on the frequency converter

the schematic diagram of this scheme is as follows, which can be used for uplink and downlink. The interlock control of the two is:

2.3 the electrical wiring diagram of the frequency conversion system is as follows:

as shown in the above figure, the circuit of the motor is equipped with "mains power" and "power saving" contactors, so that there are two working modes of "automatic" and "manual": in the manual mode, the frequency converter does not work, and the whole system starts and stops manually and operates at power frequency; In automatic mode, the motor is directly driven by the frequency converter and operates with frequency conversion. In case of failure, the system will automatically switch to power frequency operation

3. Setting of functional parameters

introduction to special functions of escalator:

commissioning process:

1 Pd. 00: set to 1, start the special function of escalator

2. Pd. 01: operation frequency 1 is the frequency setting of low-speed operation when the elevator is normally unattended, and 100% of the frequency setting corresponds to the maximum frequency (p0.07)

3. Pd. 02: operation frequency 2 is the frequency setting of high-speed operation when the escalator is occupied. 100% of the frequency setting corresponds to the maximum frequency in its modern vehicle model (p0.07). General pd 02 is set to 50Hz

4. Select one end from the p5.02 ~ p5.11 terminal input as the elevator pulse detection port. When the pulse signal is detected, the elevator will operate at the operation frequency 2, and the last pulse signal detected will start to delay. When the delay reaches the operation time of frequency 2, the elevator will return to the frequency of operation frequency 1 for operation

5. The acceleration time p0.11 is set to 1~2 seconds to ensure that guests accelerate before boarding the escalator; It is appropriate to set the deceleration time to 5~10 seconds

4. Characteristics of frequency conversion system

· this scheme adopts our CHV integrated frequency conversion energy-saving cabinet, which has the characteristics of large low-frequency starting torque and fast response speed in the open-loop vector control mode. When starting at 0.5Hz, its output torque can reach 150% of the rated torque, which can fully meet the technological requirements of the elevator

· the soft start function of the frequency converter can eliminate the current shock when the motor is started

· the frequency converter is a capacitive load, which can effectively improve the power factor of the motor and reduce reactive power loss

· the frequency converter has various electronic protection devices such as overcurrent, overvoltage, overload and overheating, and has rich fault alarm output functions, which can effectively ensure the normal operation of the whole system

· when there is no passenger flow, the running speed of the elevator is very low, and the mechanical wear is greatly reduced

· the starting, stopping and speed conversion of the variable frequency drive system are smooth and comfortable

· there are two working modes of "manual" and "automatic", such as lapping steel precision, etc. in case of frequency converter failure, it can still continue to operate according to the manual working mode

5. Conclusion

this scheme adopts inverton CHV integrated variable frequency energy-saving cabinet (dedicated for escalator), which can not only meet the requirements of stable start-up and operation of the system, large starting torque, strong overload capacity and high speed regulation accuracy; Moreover, the motor can reduce mechanical wear, prolong service life and work more safely and reliably through variable-frequency drive; At the same time, the up and down converters are connected by a common DC bus, which makes the energy-saving effect of the system more remarkable

References:

instructions for CHV series vector converter

escalator control principle and daily maintenance series (end) of Shenzhen yingweiteng Electric Co., Ltd

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