light industry

The escalator is a kind of manned lifting equipment, which is widely used in shopping malls, stations and airports. Pinghu Town Shenzhen City PARKnSHOP supermarket has six sets of automatic escalator, 11kw (Level 4) AC motor drive, gear box reducer by dragging the escalator operation. Two as one of the escalator up, another as a downlink, running for some time after the exchange of people, that is, the exchange for the uplink and downlink, downlink exchange for uplink operation. In the operation process, the flow of customers in different periods have different, sometimes take the escalator may a person also have no, because the customer arrival is random, it is impossible to escalator stops running when no one aboard the will, without speed control of the escalator can only at the rated speed idling. This operation is very economic, wasting large amounts of electricity can. Therefore, how to choose a elevator control technology of high efficiency and energy saving, has become the elevator businesses and customers are very concerned about the topic.
At present, the domestic installation of the escalator more use of a single speed AC motor as the host, equipped with brake motor or brake coil. Chain wheel drive, the rated speed of the cascade is mostly 0.5m/s. There are as many as 15-18 security limit switches. A great part of the fault in the operation is caused by the failure of the safety circuit. Even in the absence of passengers to use the escalator is still running at rated speed, with large energy consumption, serious mechanical wear, low service life, and so on. Below will be aimed at the deficiencies of this elevator specific energy saving program.
One, the whole escalator frequency conversion energy saving
In wrong escalator safety control loop do any changes to the premise, that the inverter according to the sensor generated signal, when people ride escalators, the original speed (50Hz); when no escalator down to slow or stop running.
System requirements inverter start running smoothly, good acceleration performance and start torque, strong overload capacity. At the same time, we should have when the failure of frequency converter speed control system, the control system automatically switches to the power frequency operation, security escalator transport function in the normal implementation. So I chose Shenzhen Yi Chong Fei Electric Co., Ltd. of VEICH-AC60 series of integrated energy saving cabinet (escalator special), the control cabinet design industry and trade / frequency switching, at the same time, the integrated the escalator energy-saving operation of dedicated control functional module, and is convenient for the users to use.
For customers with the escalator, the general use of the peak in the afternoon and evening hours, the rest of the time use rate is low, with considerable energy saving space. According to the above transformation principle, considered from the two aspects of the investment cost and the level of automation, intends to use the following variable frequency drive scheme: the Yi fly AC60 series of integrated inverter (escalator special) drive elevator machine, the inverter used multi segment speed control mode, and set the frequency rate (low speed), multi speed frequency 1 (high speed) two operating frequency.
1) a infrared sensor switch is respectively arranged in the elevator at the bow and stern, passengers through the elevator, infrared sensor switch is triggered and generates the switching signal to the inverter;
2) when there is a passenger flow, the infrared sensing switch is triggered, and the frequency converter is immediately accelerated to a speed of 2, and the high speed operation of the elevator is made;
3) of high speed elevator operation, inverters with built-in timer start time, if in the time period no passengers through the elevator, the time after the end of the converter will automatically switch to multi speed frequency 1, for low speed operation.
5) on the uplink and downlink of the elevator, the external control using the switch interlock, to ensure the normal operation of the escalator system;
6) for the consumption of the downlink, or the braking process of excess energy, the need to install the inverter braking resistor.
The schematic diagram is as follows, to do up, but also to do down, the two interlocking control:
The circuit of the motor are equipped with the "electricity", "energy saving" contactor, so you can choose "automatic" and "manual" mode two: manual mode, drive does not work, the whole system manually start and stop, frequency operation; automatic mode, motor by the inverter drive directly, variable frequency operation. When the fault occurs, the system automatically switches to the power frequency operation.

   

Function parameter settings
Special function introduction of escalator:
The debugging process: (additional intermediate relay self do)
1, E-01: set to 1, to the inverter operating instructions;
2, E-16: operating frequency of 1 for the elevator when no one is running at low speed frequency setting, can be set to 10HZ
3, F-9 operating frequency of 2 for the escalator when the high-speed operation of the frequency setting, generally set to 50Hz;
4, F-01: set to 5 (X1) multi segment speed terminal definition
6, F-03: set to 22 timer trigger terminal definition
7, F-30: set to 12 timer time to reach
8, E-02: set to 0
Acceleration time E-13 is set to 1~2 seconds, to ensure that guests in the board before the escalator to speed up the completion of the deceleration time set to 5~10 seconds more appropriate;
Two, frequency conversion system features
1, the scheme by ECF100 integrated variable frequency energy-saving cabinet, in the open-loop vector control mode with low starting torque, fast response characteristics, 0.5Hz startup in the output torque up to 150% of the rated torque, fully able to meet the technological requirements of the elevator;
2, the frequency converter soft start function can eliminate the motor start current impact;
3, inverter for capacitive load, can effectively improve the power factor of the motor, reduce the reactive power loss;
4, inverter with over current, over voltage, overload, overheating and other electronic protection devices, and has a wealth of fault alarm output function, can effectively guarantee the normal operation of the entire system;
5, no passenger flow when the elevator running speed is very low, mechanical wear greatly reduced;
6, variable frequency drive system start, stop and speed conversion process smooth and smooth, comfortable feeling better.
7, there are "manual" "automatic" two modes of operation, in the case of failure of the inverter, can still continue to operate according to the manual mode of operation.