(1) Overtravel When the feed motion exceeds the software limit set by the software, the overtravel alarm content will occur. According to the CNC system manual, the fault can be eliminated and the alarm can be cancelled.
(2) Overload When the load of the feed motion is too large, frequent moving in the forward and reverse directions, and poor lubrication in the feed chain, it will cause an overload fault. Generally, the alarm information such as overload, overheat or overcurrent of the servo motor is displayed on the CRT, and at the same time, the feed drive unit in the power cabinet is overloaded and overcurrent.
(3) The reasons for the incitement during the infeed are:
1 The speed measurement signal is unstable, such as the speed measuring device failure and the speed feedback signal interference.
2 position control signal is not good or unstable or interfered
3 The terminal is not in good contact, such as loose screws.
4 When the turbulence occurs at the moment of moving from the forward motion to the reverse direction, it is generally caused by the backlash of the feed chain or the servo system gain is too large.
(4) Crawling is generally caused by factors such as poor lubrication of the feed train chain, low servo system gain, and excessive load. In particular, the defects of the servo motor and the ball screw coupling itself (such as cracks) can cause the ball screw to rotate and the servo motor to rotate asynchronously, so that the feed motion is slow and fast, resulting in creep. phenomenon.
(5) Machine vibration analysis Whether the machine vibration cycle is related to the feed rate.
1 If it is related to the feed rate, the vibration is generally related to the speed loop gain of the shaft being too high or the speed feedback fault.
2 If it is independent of the feed rate, the vibration is generally related to the position loop gain being too high or the speed feedback fault.
3 If the vibration is generated during acceleration and deceleration, it is often caused by the setting of acceleration and deceleration time is too small.
(6) The servo motor does not turn the CNC system to the feed drive. In addition to the speed control signal, there is also an enable control signal, which is typically a +24V DC relay coil voltage.
1 Check if the CNC system has a speed control signal output.
2 Check if the enable signal is on. Observe the I/O state through the CRT and analyze the machine plc trapezoid (or flow chart) to determine if the feed axis's starting conditions, such as lubrication and cooling, are met.
3 pairs of electromagnetic brake servo motor, should check whether the electromagnetic brake is released
4 Feed drive unit failure.
5 servo motor failure.
(7) Position following error tolerance alarm When the servo axis motion exceeds the position tolerance range, the CNC system will generate an alarm with excessive position error, including following error, contour error and positioning error. The main reason: mechanical transmission system failure The speed control power failure, the servo system gain setting is improper or the position deviation value is set incorrectly, the cumulative error of the feed transmission chain is too large, the servo is overloaded or faulty.
(8) Drift When the command value is zero, the coordinate axis still moves, causing positional error. Eliminated by the drift compensation method and zero speed on the drive unit.
(9) Referencing point fault referencing point faults are generally divided into two categories: no reference point can be found and no reference point can be found. The former type of fault is generally the signal of the reference point deceleration switch or the zero pulse encoder zero mark or Whether the light bar zero mark has a fault; the latter type of fault is caused by improper setting of the block position when the reference point switch is set, and the block position needs to be re-adjusted.
(10) The servo motor automatically rotates after it is turned on. The main reason: the polarity of the position feedback is wrong. Due to the external force, the coordinate axis is displaced, the drive, the tachometer servo motor or the system position measurement circuit is defective, and the motor or the drive is faulty.
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