The detecting component is an important part of the CNC machine tool servo system. It plays the role of detecting the displacement and speed of each control axis. It feeds back the detected signal to form a closed loop system. The measurement method can be divided into direct measurement and indirect measurement: direct measurement is to measure the linear displacement of the machine tool by linear detection component, and direct measurement commonly used detection components generally includes: linear induction synchronizer, metrology grating, magnetic scale laser interferometer. The indirect measurement is to measure the linear displacement of the machine tool by the rotary type detection component. The commonly used detection components of the indirect measurement generally include: a pulse encoder, a resolver, a circular induction synchronizer, a circular grating and a circular magnetic grid.
When the following malfunction occurs in the machine tool, it should be considered whether it is caused by the failure of the detecting component:
1. Mechanical oscillation (when acceleration/deceleration):
(1) The pulse encoder has a fault. At this time, check whether the voltage of the feedback line terminal on the speed unit drops at a certain voltage. If there is a drop indicating that the pulse encoder is defective, replace the encoder.
(2) The pulse encoder cross joint may be damaged, causing the shaft speed to be out of sync with the detected speed and replacing the coupling.
(3) The tachogenerator fails, repairs, and replaces the tachometer.
2. Mechanical runaway (speeding):
In the case of checking the position control unit and the speed control unit, it should be checked:
(1) Whether the pulse encoder wiring is wrong, check whether the encoder wiring is positive feedback, and whether phase A and phase B are reversed.
(2) If the pulse encoder coupling is damaged, replace the coupling.
(3) Check if the tachometer generator terminal is connected reversely and the excitation signal line is connected incorrectly.
3. The spindle cannot be oriented or oriented in place:
While checking the orientation control circuit settings and adjustments, checking the orientation plate, and adjusting the spindle control printed circuit board, check whether the position detector (encoder) is defective. At this time, measure the encoder output waveform.
4. Axis vibration feed:
Check whether the motor coil is short-circuited, whether the mechanical feed screw is well connected to the motor, and check whether the whole servo system is stable, check whether the pulse code is good, whether the coupling is stable and reliable, and whether the speed measuring machine is reliable.
5. An alarm caused by a program error or an operation error in the NC alarm. Such as FAUNUC 6ME system NC alarm 090.091. An NC alarm occurs, which may be caused by a main circuit failure and a feed rate that is too low. At the same time, there may be:
(1) Defective pulse encoder.
(2) The pulse encoder Power Supply voltage is too low (at this time, adjust the power supply voltage to 15V, so that the voltage value on the +5V terminal of the main circuit board is within 4.95-5.10V).
(3) The reference point return cannot be performed normally without inputting a one-turn signal of the pulse encoder.
6. Servo system alarm number: such as FAUNUC 6ME system servo alarm: 416, 426, 436, 446, 456. Servo alarm of SIEMENS 880 system: 1364 Servo alarm of SIEMENS 8 system: 114, 104, etc. When the above alarm number appears, it may be:
(1) The shaft pulse encoder feedback signal is disconnected, short circuited and lost, and the A phase and B phase one rotation signals are measured by an oscilloscope.
(2) The inside of the encoder is contaminated, dirty, and the signal cannot be received correctly.
5V Wall Charger are wall plug adapters with 5V output, which are popularly used for tablets and mobile phones etc.
When you buy the wall mount Adapter, you should choose right plug. Besides, you should see the output current and dc plug size according to your device, the normal dc plug size are 2.5*0.7, 3.5*1.5, 5.5*2.5, 5.5*2.1, mini USB and MICRO USB etc.
For Yidashun's wall power adapter charger, there are different plugs for choose like: EU plug, US plug, UK plug, Australia plug, Argentina plug and Brazil plug and so on, which used in different countries.
Yidahsun's wall charger is with smart IC to protect your device with over current protection, over load protection, short circuit protection, over heat protection.
5V Wall Charger,5V USB Wall Charger,5V Portable Wall Charger,5V Wall Mount Adapter
Shenzhen Yidashun Technology Co., Ltd. , https://www.ydsadapter.com