Control principle of chv100 frequency converter fo

Tower crane slewing chv100 frequency converter control principle

now, tower cranes for construction in China have become more and more common, from ordinary multi-storey buildings, real estate projects, high-rise buildings to large-scale railway projects, bridge projects, electric power projects, water conservancy projects, tower cranes are applied everywhere. Computer aided design, microelectronics technology and program-controlled language control technology have been applied to tower cranes. 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 if it is started too fast. It is not allowed to stop or reverse too fast. Otherwise, it will not only run unsteadily, but also damage the mechanism. The better solution is to use frequency conversion 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

the melt temperature of Shan can be reduced by 20 degrees. Xi construction machinery factory is a manufacturer specializing in the production of construction cranes (commonly known as tower cranes). Previously, it used a general-purpose frequency converter (v/f control). Because the low-frequency torque of the machine is too small, the rotating arm vibrates badly during the starting process

now, the high-performance vector converter of NVIDIA CHV (with 6-pole 3KW three-phase asynchronous motor) can solve the above problems well

during the transformation, the braking resistance was not added at first, and the forward angle of the rotating arm was too large when stopping (40Hz, lifting a ton of weight), and the rotating arm occasionally shook during the starting process, the main 15 After the test of the wire torque tester, the output torque is not enough when starting (the motor stops during the starting process); When it cannot stop, the tower crane driver is used to reversing, and the frequency converter often jumps ou2

later, two times the standard (power) braking resistance was added. After optimizing the parking 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 of 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 the 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 is forward running

p5.03 2 S2 terminal is in reverse operation

P5. Full Chinese menu operation 0416 multi speed terminal 1

p5.05 17 multistage speed terminal 2

p5.06 18 multi speed terminal 3

p5.07 7 hdi1 terminal fault reset

p8.16 3 fault automatic reset 10 times

pa.04 users generally use universal testing machine and pressure testing machine at 60.0 low speed

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

due to the large inertia impact of the tower crane slewing mechanism, the impact is large if it is started too fast. If it stops and reverses too fast, it will make the system run unstable, even stop, and damage the mechanism. Therefore, the above-mentioned problems can be overcome by selecting inveterate CHV frequency converter with superior torque characteristics, selecting high-power braking resistance, and setting appropriate acceleration and deceleration time and start and stop mode