Introduction：
Numerically controlled machine tools, referred to as CNC machine tools for short, are mechatronic products that have integrated mechanical, electrical, hydraulic, pneumatic, microelectronics and information technologies for 30 years. The spindle and each feed system are driven by their respective motors. With the development of frequency conversion speed regulation technology, the spindle of the CNC machine tool is driven by the frequency converter, which can well meet the work needs. Qidian frequency converter D32 has a wide range of applications in CNC machine tools, and has achieved good economic and social benefits.
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：
Large starting torque, providing 0.5Hz 150% rated torque, easy to start the spindle motor;
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;
With excellent speed control accuracy, the control accuracy is 0.2%, and accurate speed control is realized;
Excellent current limiting characteristics, strong overload capacity, can effectively reduce frequency conversion overload, overcurrent protection, and maximize production continuity;
It has strong environmental adaptability, and the completely independent air duct design can greatly improve the resistance to harsh environments such as oil pollution, dust and damp heat.
System Introduction：
In this system, the 4KW CNC machine tool spindle is driven by the D32 5.5KW inverter, and the fast braking and stopping are realized through the external braking unit and braking resistor. The speed variation caused by the load change is very small by the open-loop vector control.
Technical Parameter：
| Inverter technical parameters | Device configuration | |
 Model: D32-X | Output current: 12.6A | One D32 inverter |
| Input voltage: 3-phase, 380-480V | Frequency range: 0-400Hz | 4KW CNC machine tool spindle motor |
| Input frequency: 50/60Hz ±5% | Overload capacity: 150%, 60 seconds | CNC Machine Control System |
| Output power: 5.5KW | 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 CNC machine tool control system using D32 inverter has been in 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;
Real-time monitoring and control of output current, with good dynamic response capability, and better quality of products produced;
Excellent current limiting characteristics, strong overload capacity, can effectively reduce frequency conversion overload, overcurrent protection, and maximize production continuity;
Excellent low-frequency torque characteristics, stable operation at low-speed rated torque output.
Customer Benefits：
The inverter and spindle motor run stably, reducing maintenance costs;
Reduced motor loss and maintenance costs;
The inverter's comprehensive protection function ensures maximum production continuity;
The production of products is more in line with the requirements, and the defect rate is greatly reduced.