Introduction：
The industrial centrifuge is one of the main equipments in the chemical industry. It mainly separates the solid and liquid through centrifugal force. According to the process characteristics, the material is mainly a solid-liquid mixture at the beginning, and the load is relatively large when it is just started. Under the action of centrifugal force, it flows out from the outside of the centrifugal force, so that part of the liquid is first separated, and with the further increase of the motor speed, the load is also reduced accordingly. The D32 frequency converter can meet the technological requirements and realize the separation effect of running at several different speeds. As an industrial control equipment, it has a wide range of applications in industrial centrifuges.
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 substations, 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：
Provides 250% of the rated electric current during low-frequency operation and acceleration, meeting the requirements of centrifuge operation;
With excellent speed control accuracy, the control accuracy is 0.2%, and accurate speed control is achieved;
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;
Multi-stage speed control to meet industrial production process requirements;
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 D32 22KW inverter is used to drive the 22KW centrifuge, and the multi-speed function of the inverter is selected to realize three-speed control, namely low-speed operation, medium-speed operation and high-speed operation. Quick stop is achieved through the external braking unit and braking resistor.
Technical Parameter
| Inverter technical parameters | Device configuration | |
 Model: D32 | Output current: 45A | D32 One inverter |
| Input voltage: 3-phase, 380-480V | Frequency range: 0-400Hz | One 22kW centrifuge |
| Input frequency: 50/60Hz ±5% | Overload capacity: 150%,60 seconds | Brake unit |
| Output power: 22kW | 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 industrial centrifuge 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;
Adopt energy consumption braking, soft start and soft stop, no impact on the power grid;
Excellent current limiting characteristics, strong overload capacity, can effectively reduce frequency conversion overload, overcurrent protection, and maximize production continuity;
The economic benefits are significant, and the entire investment increased by the frequency conversion control system can be recovered in more than two years;
Customer Benefits：
The use of energy-consumption braking saves the cost of brake pads and the time for replacing brake pads, the production efficiency is increased by 15%, and the comprehensive benefit is greatly improved;
The comprehensive protection function of the inverter ensures maximum production continuity;
The economic benefits are remarkable, and the entire investment increased by the frequency conversion control system can be recovered in more than two years.