System Introduction

The electrical system is composed of CNC machine, inverter, time relay and brake assembly.

The input terminals R, S, T connect with breaker. The output terminals U, V, W connect with main spindle motor. When the running command is inconsistent with the motor rotation direction, you can change any two phase of U, V, W or exchange control circuit terminal FWD/REV.

Frequency given command is given by external single with 0~10V or 0/4-20mA form, connects from VI and GND. The rotation direction and running control of motor is decided by the status of X terminal;

When X1 and COM/GND are connected, X1 is high level, the motor runs forward. When X2 and COM/GND are connected, X2 is high level, the motor runs reverse. When X1 and X2 do not connect with COM/GND, both X1 and X2 are low level, the motor stops. The connection or disconnection of X1 and COM/GND & X2 and COM/GND is controlled by two relay contacts or switch, the two contacts or switch can be controlled by main spindle runs forward and main spindle runs reverse commands given by the numerical control system. At the same time, relay output terminals could set as: Running output or Fault output.

CNC Machine Introduction

The main motion of CNC machine is rotation motion of main spindle via chuck or apex drives work piece, is used to transmission and speed governing via motor drives gearbox. During machining process, usually there is a requirement for a different rotation speed of main spindle, operation staff controls separation and integration of clutch via multiple positions of handle combination, gets multiple combination of gear to obtain multiple speeds, operation is inconvenience and maintenance is large, practices show that the fault rate of electromagnetic clutch using to adjust speed is high. The old feature of main spindle drive can not meet the requirement which the fast developing economy asks for CNC machine. Currently, more and more VFD inverters match with CNC machine to control main spindles.

Application of CNC Machine