Application of yingweiteng inverter in the hoistin

Application of inverton frequency converter in the lifting industry

Abstract: inverton CHV180 series vector frequency converter is used in the lifting industry to control lifting and trolley motors. It adopts closed-loop vector control, S-curve acceleration and deceleration, and no slip hook, ensuring the stability and convenience of system operation. Multi motor parameter identification. Single frequency converter realizes multi group motor control through parameter switching

keyword: CHV180, closed-loop vector, parameter switching

abstract: CHV180 series special inverter has widely applied in crane and hosting industries It is close-loop vector control mode to control up lifting and motors motions through s-curve and other features which guarantee the reliability and conveniences of the whole system. And it has the function of parameters identification for multi-motors which can control multi-motors by single inverter through parameters shifting.

Keywords：CHV180, close-loop vector control, parameters shifting.

I. system overview:

gantry crane is a typical equipment in the lifting industry, which is widely used in indoor and outdoor warehouses, workshops, wharves and open storage yards. There are three general systems: lifting, crane and trolley. The typical hrb4003 ribbed steel process needs to be controlled. Now it can be realized by variable frequency speed regulation. Among them, the hoist has the highest requirements for the frequency converter, and there is no "slip hook" phenomenon in the up and down directions. In terms of performance, at least 150% of the rated torque needs to be output at zero speed; Reliable holding brake timing control is required in function. The crane and trolley share a frequency converter control, which can realize the identification and switching of two groups of parameters. To reduce the overall cost of the equipment

according to the above characteristics, our company has developed special software and hardware, which are configured in CHV180 series products. Realize the precise control of the crane

for lifting machinery, closed-loop vector control is adopted to increase the holding brake control function. Effectively realize no slip hook; The built-in S-curve acceleration and deceleration mode ensures the stability of heavy objects during lifting. For the switching control of single frequency converter of large and small vehicles, in addition to the function of improving the performance of machinery, it also adds special functions. A single frequency converter can identify multiple motors in parallel. At the same time, a single frequency converter controls two groups of motors. When which group of motors needs to be controlled, the frequency converter automatically switches to which group of motor parameters

system advantages:

1 Reliable holding brake logic control, and the holding brake time is adjustable, which not only ensures that the hook does not slip, but also avoids the large impulse current of the motor

2. High performance closed-loop vector control can output 180% of the rated torque for 10s at zero speed. It increases the reliability of the system

3. The acceleration and deceleration follow the S-curve mode, which increases the stability of the work and reduces the mechanical impact. Extend the service life of the equipment

4. After multiple motors are connected in parallel, the frequency converter automatically identifies the parameters and establishes an effective mathematical model. The control accuracy is very high

5. A single frequency converter switches and controls two groups of motors, and automatically identifies and stores two groups of motor parameters. The cost of the whole machine is reduced, and the competitiveness of the whole machine is greatly improved

6. Adjustable torque compensation for precise control

II. System block diagram:

III. control principle:

the main lifting motor is controlled by a single frequency converter for vector closed-loop operation, in which the band brake control is signaled by the frequency converter to the PLC control cabinet, and the control cabinet controls the release of the band brake after receiving the signal. The lifting frequency converter is externally connected with the braking unit DBU (equipped with dynamic resistance) or the feedback unit rBU to directly feed back the energy to the electricity. DBU is used in this system

crane and trolley control is realized through special parameter group. During operation, after receiving the switching signal sent by the control cabinet, the frequency converter automatically switches to the control group motor through a certain time delay (parameter setting), and switches the encoder parameters at the same time, so as to achieve the purpose of a single frequency converter controlling two groups of motors

IV. debugging process:

1 Lifting and debugging process:

1) motor parameter identification: the identification of motor parameters is carried out when the motor shaft is disconnected from the load. The specific process is as follows:

a) first set the motor parameters, as shown in the following table: input the motor parameters p2.00, p2.04-p2.08

b) set the encoder parameters p4.00-p to play the role of the national new material industry development leading group office 4.01,

c) according to the motor acceleration and deceleration time proposed by the customer, Calculate the acceleration, deceleration and shutdown time of S-curve p1.08-p1.13,

d) carry out motor parameter self-learning, and the learned parameters are shown in the following table:

2) holding brake timing control:

no-load closed-loop vector operation, observe the no-load current and the normal operation of the motor, set the lower parameters to test the holding brake timing control:

crane set parameters:

a) set encoder parameters p4.00-p4.01, (Note: the encoder with the same specification and model needs to be selected for the cart and trolley)

c) according to the acceleration and deceleration time of the motor proposed by the customer, calculate the acceleration, deceleration and shutdown time of the S-curve p1.08-p1.13,

d) carry out the motor parameter self-learning respectively, and the learned parameters are shown in the following table:

the normal self-learning parameters of the cart are:

through the analysis of the physical characteristics of the test sample, through parameter switching, Self learned crane parameters are:

3) crane and trolley operation:

after learning the parameters, the holding brake timing control commissioning and on load commissioning can be carried out according to the method of lifting the host. Through the added parameter group (see 5), the operation console controls the switching action of the crane and trolley, and the frequency converter automatically switches the two groups of parameters and drives the two groups of motors to operate in closed loop respectively

v. parameter summary table:

conclusion

the crane industry has very high requirements for the performance and function of frequency converters. At present, domestic frequency converters are rarely used in mainstream equipment in this industry. Through market research, foreign brands such as Siemens, abb, Ge, Yaskawa, etc. dominate this market. In this case, through in-depth market analysis, inverton developed a series of special inverter products chv18 material backup for the lifting industry: the test data can be kept in the willful hard disk partition 0 series. Through the actual operation on site, it has achieved good results

references

1 Instructions of CHV series vector converter, inverton Electric Co., Ltd. 2007

2 Code for design of cranes national standard gb/t3811 2004 (end)