Elevator Solution

1、 process requirements

The system requirements of inverter start running smoothly The system requires the inverter to start running smoothly, good acceleration performance, large starting torque, strong overload capacity, at the same time should have when inverters’ system fault occurs, the control system will automatically switch to the normal power frequency operation, guarantee the implementation of escalator conveying function.

For passenger escalators, the peak period usually occurs in the afternoon and evening hours, and the utilization rate is low during the rest of the period. According to the above transformation principle, considering from the two aspects of the investment cost and the level of automation, intends to use the following frequency conversion scheme: using variable frequency drive FR200 series inverter driven elevator Fu ray host, multi speed control mode of the inverter, and set the frequency (low speed), multi speed frequency 1 (high speed) two operating frequency.

u An infrared sensor switch is installed at each end of the elevator, and when the passengers pass through the elevator, the infrared sensor switch is triggered and send a switch signal the inverter.

u When there is passenger flow, the infrared sensing switch is triggered, and the inverter immediately accelerates to multi-step frequency 1, and make the elevator run at a high speed;

u When the elevator runs at high speed, the built-in timer of inverter starts timing, if  no passengers through the elevator during the time period , after the end of time, the inverter will automatically switch to the multi-step frequency 0, and make the elevator run at a low speed;

u If a passenger switches the photoelectric switch during the timer, the timer will be re-timed.

u For the uplink and downlink of the elevator, the external control is interlocked with switches to ensure the normal operation of the escalator system.

u The brake resistor shall be installed on the inverter to excess energy resulting from consumption, down, or braking.

2、 Control scheme

（1）、Control principle diagram

（2）、Schematic diagram of electrical control

The circuit of the motor are fitted on the "power", "energy saving" contactor, so that there can be "automatic" and "manual" two working modes: manual mode, drive does not work, the whole system manual stop, power frequency operation; automatic mode, direct drive motor by frequency converter, frequency conversion operation. When a fault occurs, the system automatically switches to power frequency operation.

3、 control advantages

(1) The scheme uses FR200 inverter with low-frequency high start torque, fast response characteristics in automatic torque control mode, the 0.25Hz startup torque up to 180% of rated torque, can fully meet the requirements of the technology of escalator;    (2) The inverter is a capacitive load, which can effectively improve the power factor of the motor and reduce the reactive power loss;

(3) Inverter has many kinds of electronic protection devices such as short circuit, short phase, over-current, overvoltage, overload, overheating, etc., and it has a rich fault alarm output function, effectively ensuring the normal operation of the whole system;

(4) When there is no traffic flow, the speed of the elevator is very low, and the mechanical wear is greatly reduced;

(5) The process of starting, stopping and speed conversion of frequency conversion drive system is smooth and comfortable;

(6) There are two manual / automatic modes of operation, which can continue to operate manually when the inverter fails.

FR200 series is special elevator drive developed for all type of elevator like home lifts, passenger and goods lifts etc. Here Frecon gives the detailed solution installation and commissioning details for FR200 series. Engineering practices, market survey and feedback shows that FR200 series elevator inverter has good control performance and stability.

4、 The main parameter settings