Wide grid voltage: ±20% grid voltage, easy to cope with different grid conditions; 2, the new dual-CPU hardware control platform, the control performance is greatly improved, to achieve constant torque boost, will not affect the load increase due to network fluctuations; The advantages of the hoist adopting frequency conversion speed regulation: Black Ceiling Fan,Rustic Ceiling Fans,Farmhouse Ceiling Fan,Industrial Ceiling Fans JIANGMEN ESCLIGHTING TECHNOLOGY LIMITED , https://www.jmesclightingfan.com
1, wide grid voltage: ± 20% grid voltage, calmly cope with different grid conditions;
2. The new dual-CPU hardware control platform greatly improves the control performance and achieves constant torque boost, which will not affect the load increase due to network fluctuations;
3, with a strong load capacity, large starting torque, to achieve a soft start of the motor.
4. The motor can be steplessly regulated, the current impact is small, and the process of adding and decelerating is smooth, which greatly reduces the strength of mechanical impact;
5. It is easy to combine with the interface of external control equipment to realize flexible control mode on site.
6. Using energy-consuming braking, feedback braking or super-capacitor absorption technology, the problem of regenerative energy processing of the potential energy load during fast, deceleration or emergency stop is successfully solved, and the safe operation of the frequency converter is ensured;
7. The energy saving effect is remarkable, especially in the low speed section, the energy saving effect is very obvious.
Second, the selection of the inverter:
The user hoist motor model specification is 95KW/110KW/132KW. Correspondingly, the INVT vector CHV hoist inverter 110KW/132KW/160KW is selected.
Third, INVT hoist inverter introduction:
The INVT hoist inverter uses Siemens IGBT as the main loop power device, and the microprocessor realizes full digital control. Its control software is specially designed for hoisting the load of the machine. It fully considers the special requirements of the actual operation of the hoist, adopts various measures to ensure the safe operation of the system, and can set various parameters to meet the hoist under different working conditions. The need to run.
The hoist inverter has the following features:
1. Starting torque: When there is no PG vector control, 0.5HZ output 150% rated torque; when there is PG vector control, OHZ output 180% rated torque, which meets the requirements of heavy load starting.
2. For soft load and soft stop for heavy load, the starting current is small, the starting speed is stable, and the impact on the power grid is small.
3. The frequency of the inverter is continuously adjusted, and the preset is segmented, which makes the speed regulation more convenient and reliable, and the operation is more stable. 4. Provide RS485 communication interface, adopt the international standard MODBUSRTU communication protocol, and conveniently realize the upper PLC or industrial computer to frequency conversion. Networking and remote control.
5, a variety of operational control and protection, such as overcurrent, overvoltage, overload, undervoltage, phase loss, short circuit, etc.
Fourth, the main function of the INVT hoist inverter:
1. Feedback brake: The inverter uses the energy feedback unit to return the regenerative energy to the grid.
2. Energy consumption braking The energy consumption braking unit can be used alone or in combination with the energy feedback unit.
3. After the DC brake master controller gives the “forward rotation†or “reverse rotation†command, if the “loose gate†signal is not given, the inverter will apply DC braking torque on the motor to ensure the loosening system. The heavy truck does not slip during the brake process. After the "release" signal is given, the frequency converter starts running. After the brake oil pump is turned on, if the brake is accidentally released, the “loose brake†stroke switch is activated.
The inverter receives the “loose†signal and applies DC braking torque to the motor to ensure that the heavy truck does not slip.
When the heavy truck stops in the middle of the wellbore, after the inverter goes from high speed to stop, the DC braking torque is applied to stop the motor from rotating. When the mechanical brake is activated, the DC brake is removed, so that the heavy truck is mechanically hung. The effect of the brake stops.
4. Automatic deceleration:
After receiving the deceleration signal given by the system, the inverter starts the deceleration program in the machine and gradually reduces the running speed of the hoist according to the setting requirements.
5. Multi-speed control The multi-speed control is preset in the inverter, which corresponds to the different operating frequencies of the inverter to meet the requirements of the control system for different operating speeds of the hoist.
The corresponding frequencies of each speed segment can be set separately to meet the operation requirements of various working conditions.
6. Emergency stop The inverter provides the emergency stop signal input terminal. After the emergency stop signal is activated, the inverter stops output immediately, the motor is in free running state, and then stops by mechanical brake device.
V. Electrical system transformation plan:
Transformation method:
The inverter used in the transformation of the hoist is based on the original electronic control system, replacing the original power frequency speed control system with the frequency conversion speed control system, while retaining the power frequency speed control system, so that the two systems are mutually standby and increase the system operation. reliability.
When the transformation is carried out, it is necessary to increase the work and frequency conversion functions. Before the system is running, switch the main circuit and control circuit switches to the corresponding frequency or power frequency position.
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Submission:
The hoist adopts the frequency conversion speed regulation technical solution