Application of the hottest chv100 frequency conver

2022-08-02
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Application of chv100 frequency converter in tower crane slewing control

introduction

now, tower cranes for construction in China have become more and more common, and the electricity price of power plants may be more expensive due to the global energy shortage. From ordinary multi-storey buildings, real estate projects, high-rise buildings to large-scale railway projects, bridge projects, power projects, water conservancy projects, tower cranes are used everywhere. Computer aided design, microelectronics technology and program-controlled language control technology have been applied in the tower crane. 10. Pushing the lower pressing plate into the experimental machine. Among them, the control development trend of hoisting mechanism, slewing mechanism and trolley luffing mechanism is to adopt frequency converter control

the slewing mechanism is characterized by large inertia impact. The impact is large when starting too fast. It is not allowed to stop or reverse too fast. Otherwise, it will not only run smoothly, but also damage the mechanism. The better solution is to adopt variable frequency speed regulation to make the starting and braking stable. And after using frequency converter control, the system control is simpler, and the control system has multiple protection, making the system more safe and reliable

tower crane frequency conversion control scheme

I. tower crane slewing frequency conversion control principle

Shanxi construction machinery factory is a manufacturer specializing in the production of construction cranes (commonly known as tower cranes). Previously, it used a universal frequency converter (v/f control). Because the low-frequency torque of the machine is too small, the rotating arm vibrates severely during startup

yingweiteng ch is now used. By 2020, V (with 6-pole 3KW three-phase asynchronous motor) high-performance vector converter can well solve the above problems. The electrical wiring diagram is as follows:

during the transformation, the braking resistance was not added at first, the forward angle of the rotating arm was too large (40Hz, lifting a ton of weight), and the rotating arm occasionally shook during the starting process, mainly because the output torque was insufficient during the starting process (the motor stopped during the starting process); When the crane can not stop, the tower crane driver is used to reverse direction, and the frequency converter often jumps ou2

later, two times of standard (power) braking resistance was added. After optimizing the shutdown parameters of the frequency converter, the forward angle of the rotating arm was less than 20 degrees (40Hz, lifting a ton of weight) due to inertia, which had reached the national standard for construction cranes

by changing the acceleration and deceleration time and increasing the starting torque and starting frequency, the motor has never stopped and jittered

II. Main function code setting of frequency converter

p0.01 1 terminal command channel

p0.035 multi-stage speed operation setting

p0.11 7.0 acceleration time

p0.12 15 deceleration time

p1.01 4.0 direct start start frequency

p1.02 0.1 starting frequency holding time

p1.05 1 acceleration and deceleration mode is S-curve type

p1.06 the proportion of the beginning section of 20 s curve is 20%

p1.07 the proportion of the end section of 20 s curve is 20%

p1.08 0 free shutdown

p3.00 30 speed loop proportional gain

p5.00 1 hdi1 is the switching value input

p5.021 S1 terminal operates in forward direction

p5.032 S2 terminal is in reverse operation

p5.04 16 multistage speed terminal 1

p5.05 17 multistage speed terminal 2

p5.06 18 multistage speed terminal 3

p5.07 7 hdi1 terminal fault reset

p8.16 3 fault automatic reset for 10 times

pa.04 60.0 low speed section

pa.06 80.0 medium speed section

pa.10 100.0 high speed section

for other details, please refer to the manual of CHV series vector converter

summary

because the slewing mechanism of the tower crane has a large inertia impact, the impact is large if it is started too fast. If it stops and reverses too fast, the system will run unsteadily, even stop, and damage the mechanism. Therefore, the above-mentioned problems can be overcome only by selecting inveterate CHV frequency converter with superior torque characteristics, selecting high-power braking resistance, and setting appropriate acceleration and deceleration time and start/stop mode for about the exhibition. (end)

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