Star servo drive maintenance
Model: NAS4C250M
Fault: with load alarm
Fault analysis: this drive for injection molding machine dedicated servo driver, according to the requirements of customers is their own maintenance and replacement of bridge rectifier filter capacitor, the original fault is not shown tripping, open the enclosure measurement module and the power supply voltage is normal. Link test motor encoder and the main loop control signal test found that the driving circuit abnormalities lead to unbalanced three-phase output. Replacement of drive circuit components after the lifting of the fault.
Common fault of star servo drive:
1, rectifier module damage is usually caused by the grid voltage or internal short circuit. In the case of the exclusion of internal short circuit, the replacement of the rectifier bridge. When dealing with faults in the field, we should focus on the user‘s power grid, such as the power grid voltage, the electric welding machine and so on.
2, inverter module damage is usually caused by damage to the motor or cable and drive circuit. After repairing the driving circuit, the test drive waveform is in good condition, and the module is replaced. After replacing the drive board in the field service, check the motor and the connecting cable. In the determination of no fault, to run the inverter.
3, on the electric power is not generally due to the switch power supply damage or soft charging circuit damage caused by DC circuit without DC power, such as the starting resistance damage, the operation panel damage also will produce this kind of condition.
4, shows that the voltage or under voltage is usually due to the lack of input phase, circuit aging and circuit board caused by damp. The solution is to find out the voltage detection circuit and the detection point, the replacement of damaged devices.
5, shows that the current or grounding fault is usually due to the current detection circuit damage. As Holzer element, circuit etc..
6, the power supply and the drive board start to show that the current is usually caused by the failure of the drive circuit or inverter module.
Jia Hong Wei repair service hotline: 0755-28916839, 13640994287 Shaw