Reasons and treatment methods of abnormal failure and runaway of Shenyang machine tool
1. Reasons and treatment methods of Shenyang machine tool out of control:
Shenyang machine tool runaway refers to the sudden change of speed and position of the Shenyang machine tool when it is turned on or during work, such as a sudden impact when the servo starts, a sudden rapid movement in a certain direction when the table stops, and a sudden increase in normal processing. Wait. Causes of its failure, gun apricots and processing methods
2. Shenyang machine tool vibration refers to the vibration of the machine tool when it is moving or stopping, crawling during movement, and unstable movement during normal processing. The cause of the failure, inspection and treatment
3. Poor positioning accuracy and processing accuracy Shenyang machine tool positioning accuracy and processing accuracy can be divided into positioning overshoot, poor single-pulse feed accuracy, poor positioning point accuracy, and poor circularity in circular interpolation processing. Causes, inspection and treatment methods of Shenyang machine tool failures,
4. The alarms on the speed control unit are on the control board of the FANUC PWM speed control unit. There are 7 alarm lights on the lower right. They are:
① BRK, HVAL, HCAL, Ovc, LVAL, TCLS and DCAL.
② Below them are two status indicators: PRDY (position control 巳 ready signal) and VRDY (speed control unit ready signal). Under normal circumstances, once the power of the Shenyang machine tool is turned on, the PRDY light should be on first. The VRDY light will turn on after a while. If it is not in this order, it also indicates that there is a problem with the servo unit. Once the above 9 indicators indicate a fault, follow the flowchart below to diagnose it.
③ BRK alarm indicates that the circuit breaker trip and action alarm only occur in the DC servo unit, and its troubleshooting sequence flow
5. Cause of failure: The main circuit current of the DC power supply in the speed control unit is too large, which causes the circuit breaker overload protection element to act, cut off the main circuit power supply of the control unit, and start the protection.
6. Exclusion method:
① Turn off the main power supply of Shenyang machine tool, wait for the overload protection of the circuit breaker to reset, then turn on the main power supply and the power of the speed control unit respectively, and observe whether the Shenyang machine tool is malfunctioning.
② If the circuit breaker is tripped when it is turned on, check whether the rectifier diode module of the main circuit of the speed control board is short-circuited and whether the filter capacitor is short-circuited. If damaged, replace the new device according to the original device parameters.
③ If the circuit breaker can be closed and the machine cannot work, the speed control unit may be faulty.
HVAL alarm This is an over-voltage alarm. This alarm occurs in the middle of DC servo and AC servo units. Its troubleshooting sequence
