Introduction：
Blast furnace ironmaking is one of the important production process chains (ironmaking, steelmaking, casting and rolling) in the iron and steel industry, and the blast furnace charging system is a key link in blast furnace ironmaking production. The raw materials are continuously sent to the blast furnace through the furnace top to ensure the normal demand of blast furnace ironmaking. D32 frequency converter has a mature application in the double-car hoisting and feeding system of iron-making blast furnace.
Features：
D32 is a wall-mounted inverter, the power range is 0.75KW-500KW, the voltage level of the incoming line voltage is 380V-480V, and the control method is vector control without speed sensor. D32 has a wealth of control devices, including 8 digital inputs (LI1-LI8), 2 analog inputs (AI), 2 relay outputs (TA), 2 analog outputs (AO), 5V auxiliary power supply for analog power supply Fixed input, 24V auxiliary power supply is used for digital input, all LI/TA, AI/AO can be freely programmed to define functions.
MODBUS interface is standard configuration of D32, no option is required. The D32 can be connected to higher-level automation systems via MODBUS.
Advantage：
Good low frequency performance (1.5 times the torque output at 0.5Hz open loop), which better meets the full load requirements;
It has the advantage of fast torque response, and when the load fluctuates, the current fluctuation is small;
It has good overload capacity and environmental adaptability, and has high operational reliability;
The low-frequency output performance is good, the torque response is fast, and the speed stabilization accuracy is high.
Excellent current limiting characteristics, strong overload capacity, can effectively reduce frequency conversion overload, overcurrent protection, and maximize production continuity;
Strong environmental adaptability, completely independent air duct design can greatly improve the resistance to harsh environments such as oil pollution, dust and humidity;
System Introduction：
In this system, a 160KW hoist motor is driven by a D32 200KW inverter, and one hoist simultaneously drives the left and right two trolleys to go up and down each other, that is, one of the trolleys feeds upward, and the other trolley Descend for an empty car. The inverter bus voltage may be pumped up in occasions such as deceleration braking and top unloading, and the external braking unit and braking resistor are used to achieve rapid braking and stopping.
Technical Parameter：
| Inverter technical parameters | Device configuration | |
 Model: D32-X | Output current: 380A | One D32-X inverter |
| Input voltage: 3-phase, 380-480V | Frequency range: 0-400Hz | One 160kW hoisting motor |
| Input frequency: 50/60Hz ±5% | Overload capacity: 150%, 60 seconds | Brake unit |
| Output power: 200KW | Ambient temperature: -10-40°C | Braking resistor |
| Output voltage: 0-480V (the maximum value is determined by the input voltage) | Protection level: IP20 | |
On Site Usage：
According to the on-site space situation, a D32 series inverter is installed in the control cabinet, and the inverter installation and on-site motor are as shown in the figure
Running Result：
The blast furnace double car hoist feeding control system using D32 inverter has been put into operation for more than three years, and has achieved good economic and social benefits
The control device operates reliably, has good environmental adaptability, can resist harsh environments such as oil pollution, dust and damp heat, and has a low failure rate;
Realize the smooth lifting and speed change of the feeder, and avoid the phenomenon of large start-up vibration, easy slippage and trailer phenomenon of the traditional winch system;
- Excellent current limiting characteristics, strong overload capacity, can effectively reduce frequency conversion overload, overcurrent protection, and maximize production continuity.
Customer Benefits：
The impact of mechanical parts is small, the amount of equipment maintenance is reduced, and the maintenance cost is greatly saved;
The comprehensive protection function of the frequency converter ensures maximum production continuity;
The operation of the system is safe and reliable, and the economic benefits are remarkable.