Source：Shengda Yu Published：2014-04-22 Clicks：12954
Spindle servo unit displays the AL-02 report for (velocity error is too large) NC system makes the spindle rotation instruction (M03, S1000), the spindle at very low speed of rotation (45r/min), and the spindle load table pointer is over 125%, then the spindle servo unit displays the AL- 02. The servo unit control circuit board is moved to the other models of the same system and working on the run, find the control board is working. So we detect fault system motor part of the feedback signal, the signal is not found in normal signal shown in Figure 1, open the motor tail found after mounting screws loosening of the sensing head, a sensing surface and tooth plate distance increases. Right after installation, troubleshooting.
It is the S series spindle servo motor speed detector using magnetic sensing resistor encoder consists of a toothed rotor and magnetic resistance sensor. This encoder is made according to the magnetoresistance effect of semiconductor physics. When the flux change through the magnetic resistance cross section, magnetic sensing resistor is changed, when the gear rotor, addendum and tooth bottom alternately turned the sensor surface, caused by magnetic semiconductor magnetic sensing element changes alternately in between high and low, resulting in the output end is the potential periodic change.
This kind of sensor in installation requirements of the sensor surface and the tip distance of 0.15 ± 0.02mm, too close to the tooth top broken sensor, signal too far is too weak. Therefore, repair personnel should be paid attention to in the detection of.