The CNC system is the core of the electrical control system of CNC press brake machine tools. After running for a certain period of time, some components of the CNC system of each press brake are inevitably damaged or malfunctioning.In order to prolong the service life of components as much as possible and prevent various faults, especially malignant accidents, it is necessary to carry out daily maintenance and upkeep of the CNC system.Mainly includes: inspection of the use of the CNC system and daily maintenance of the CNC system.

In order to avoid unnecessary malfunctions during the use of the CNC system, operators of CNC press brake machine tools should carefully read the relevant operating instructions before using the CNC system. They should have a detailed understanding of the performance of the CNC system used, and be proficient in the functions and precautions of each button, button, and switch on the CNC system and machine tool operation panel. Generally speaking, CNC systems need to be inspected before and after power on.

1. Inspection of CNC press brake system before power on

To ensure the normal operation of the CNC press brake system, the CNC system can be checked in the following order before the first installation and debugging of the CNC machine tool or before the first power on operation after the machine tool is transported:

（1）Confirm whether the specifications of the AC power supply meet the requirements of the CNC device, mainly checking the voltage, frequency, and capacity of the AC power supply.

（2）Carefully check whether all connecting cables between the CNC device and the outside world are correctly and reliably connected according to the randomly provided connection technical manual. The connection of the numerical control system refers to the connection between the numerical control device and its supporting feed and spindle servo drive units, mainly including the connection of external cables and the connection of the numerical control system power supply.Before connecting, carefully check the CNC system device and MDI/CRT unit, position display unit, paper tape reader, power supply unit, various printed circuit boards, servo units, etc. If any problems are found, timely measures should be taken or replaced. At the same time, attention should be paid to checking whether the connectors and printed circuit boards in the connection are tightened, whether they are inserted in place, whether the plugs are loose, and whether the fastening screws are tightened, as faults caused by poor quality are the most common.

（3）Whether the hardware settings on various printed circuit boards inside the CNC device meet the requirements of the CNC device.These hardware settings include various short-circuit bar settings and adjustable potentiometers.

（4）Carefully check the protective grounding wire of the CNC machine tool. Numerical control machine tools should have good grounding wires to ensure equipment and personal safety and reduce electrical interference. Protective grounding wires should be connected between servo units, servo transformers, and high-voltage cabinets.

Only after the above checks are confirmed to be correct, can the CNC device be put into power operation.

2. Inspection of CNC press brake system after power on

The inspection of the CNC system after power on includes:

(1) Firstly, it is necessary to check whether each fan in the CNC device is operating normally, otherwise it will affect the heat dissipation of the CNC device.

(2) Confirm whether the DC power supply on each printed circuit or module is normal and within the allowable fluctuation range.

(3) Various parameters of CNC devices. Including system parameters, PCLL parameters, digital settings of servo devices, etc., these parameters should comply with the instructions provided with the machine.

(4) When the CNC device is connected to the machine tool and powered on, preparations should be made to press the emergency stop button at the same time as the power is turned on, in case of emergency situations where the power can be cut off at any time.

(5) In manual mode, move each axis with low-speed feed and pay attention to observing whether the direction of machine movement and coordinate values are displayed correctly.

(6) Perform several actions to return to the reference point of the machine tool, which is used to check whether the CNC machine tool has the function of returning to the reference point, and whether the position of each return to the reference point is completely consistent.

(7) Functional testing of CNC systems. According to the user manual of the CNC machine tool CNC system, test the functions that the CNC system should have manually or by programming the CNC program. For example, functions such as fast point positioning, line interpolation, arc interpolation, tool diameter compensation, tool length compensation, fixed loop, user macro program, as well as M, S, and T.

Only after passing the above checks and confirming that there are no errors, can the CNC device officially operate.