Crane refers to a multi-action lifting device that vertically lifts and moves heavy objects within a certain range, also known as overhead crane, traveling crane and crane. The bridge crane is installed horizontally in large factories and mine workshops, storage yards, station yards, port terminals, etc. The overhead crane runs longitudinally on the elevated rails on both sides. It can make full use of the space under the bridge to lift goods without being hindered by ground equipment. It is the most widely used lifting equipment. The characteristic of lifting equipment is intermittent work, that is, the corresponding mechanisms for actions such as retrieving, moving, and unloading in a working cycle are alternate jobs. Due to the rapid development of modern logistics, cranes have to be developed and used in the market. The wider.
With the increasing maturity of frequency conversion speed regulation technology, frequency converters have been widely used in the lifting industry. Based on market demand and the characteristics of the lifting industry, Puchuan Technology has specially developed a special PI500L lifting inverter based on the PI500 current vector inverter. PI500L is specially designed for lifting and upgrading industries, and adopts international advanced vector control methods to meet the requirements of safety, stability, reliability, and high efficiency used in its industry. Mainly used in cranes such as ports, mining machinery, factories and mining enterprises, construction machinery and so on.
1. PI500-L has the following characteristics:
1. Power range: 0.4kW ~ 800kW
2. Sequential logic control of the brake
3. Perfect motor self-learning function
4. Master and slave control synchronization technology
5. Perfect RS485 communication function
6. Control loop power and main power can be controlled separately
7. 2 sets of motor control and switching functions
8. Pre-excitation, starting pre-torque compensation function
9. Current vector control technology 0.5hz to achieve 150% torque output (no PG control)
10. Rich peripheral interfaces and powerful protection functions
Second, on-site application examples:
2.1. Site equipment status
2.2. Field application pictures:
3. Application summary:
General Transit PI500L series inverter is a special inverter specially developed according to the characteristics of the lifting industry. This inverter has a good low-frequency starting torque, a strong current impact force, a perfect timing control function, a wide range of speed adjustment, and a full range of power. It not only realizes the soft start and soft stop functions of the motor, but at the same time, various perfect and reliable protection functions can protect the safety of the motor and the inverter and reduce the impact on the power grid and equipment. The standard modbus rtu communication protocol is convenient for users to realize remote control, making the system achieve reliable and safe operation.
More cases
â‘ At present, a large number of frequency converters are used in building hoists to replace the traditional power frequency control, which makes the system run more smoothly, greatly improves the safety and comfort of the equipment, and also reduces the system failure rate, improves production efficiency, and saves equipment. Maintenance costs.
Solution advantages:
Hefei hoist used two sets of braking schemes, both mechanical brake and DC brake. The advantage of DC braking is fast response and adjustable braking torque. The two sets of programs just complement each other's advantages, and the safety of the elevator is further improved.
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Electric hoist is a special lifting equipment installed on overhead crane and gantry crane. The electric hoist has the characteristics of small size, light weight, simple operation and convenient use. It is widely used in industrial and mining enterprises, storage, docks and other places.
Solution advantages:
This type of crane is modified by a frequency converter for stepless speed change, which solves the problem that the speed of the crane cannot be adjusted during use. In order to reduce the cost of equipment, the main hook and the trolley of the electric hoist crane adopt the same frequency converter solution. The trolley and the main hook are mechanically and electrically interlocked to ensure that they cannot run at the same time.
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Tower cranes are the most commonly used lifting equipment on construction sites. They are used to hoist construction materials such as steel bars, corrugated bars, concrete, and steel pipes. The tower crane is basically composed of three parts, elevating, amplitude changing and slewing.
Solution advantages:
The hoisting, slewing and luffing mechanism adopt frequency conversion stepless speed regulation, soft start and stop, improve the performance of the whole machine and prolong the service life of the machine. The frequency converter that controls the swing function uses eddy current braking, which improves the safety and reliability of the tower crane control system.
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