加工中心回零故障有以下几类:

　　Machining center back to zero failure has the following categories:

　　机床回参考点时无减速动作，一直运动到触及陷们开关因超程而停机。

　　When the machine back to the reference point without slow motion, the movement to hit trap because of distance and stop switch.

　　Produce the fault may be due to the slow signal no input to the numerical control system, it may return reference point deceleration switch failure reasons, switch can't reset after pressure, slow stop loose shift, when the machine back to the reference point zero pulse doesn't work, etc.

　　Remove of the machine tool coordinate distance should use "distance to remove" function button, the machine within the itinerary, and then check back to the reference point deceleration switch is normal and the corresponding travel switch signals have a short circuit or open circuit phenomenon, etc.

　　回参考点过程有减速，但直到触及限位开关报警而停机，没有找到参考点，回归参考点操作失败。

　　Back to the reference point process is slow, but it was not until reach the limit switch alarm and shutdown, found no reference points, return reference point operation failed.

　　可能是编码器(或光栅尺)在回参考点操作中没有发出已经回参考点的零标志位信号。

　　(or may be encoder grating feet) in return reference point in the operation are already back to the reference point of zero marks a signal.

　　May be back to the reference point of zero mark position signal is lost in the transmission or processing.

　　可能是测量系统硬件故障，对回参考点的零标志位信号不识别。

　　Measurement system hardware failure, may be right back to the reference point of zero marks a signal recognition.

　　诊断时， 可使用信号跟踪法，用示波器检查编码器回参考点的零标志们信号，以判断故障原因。

　　Diagnosis, can use signal tracking method, use oscilloscope to check the encoder signal back to the reference point of zero marks, to determine the cause of the problem.