Breakdown 1: No coordinate memory for software after power failure
| Breakdown Causes | Solutions |
| No coordinate memory function for 980 system (below V3.0, V3.0 not included) | Select software version with memory function (above V3.0) |
Breakdown 2: Invalid G50 coordinate setting
| Breakdown Causes | Solutions |
| No G50 function or G50 function invalid in 980 system | In “Type-in Mode”, set up G50, add T instruction and improve G50 |
Breakdown 3: Mismatch of coordinate and planker position after returning to program starting point
| Breakdown Causes | Solutions |
| Program error and cannot return to the original place | Modify the program when there is error in it |
| Heavy cutting force makes the machine step out | Modify machining process, reduce cutting feed amount |
| Computer or machine tool breakdown | Adopt interchangeable method to diagnose breakdown, gradually narrow down breakdown range, use method of exclusion to find out key breakdown part and maintain it |
Breakdown 4: Coordinate deviation of mechanic zero
| Breakdown Causes | Solutions |
| System is interfered, zero drift during zero return | Install anti-interference resistor |
| Improper selection of zero return switch; while selecting block switch, because of different performances of block switch, some are tight and some loose on the machine, which makes the upspring sometimes fast and sometimes slow and further the positioning deviate. As for servo system, normally zero return ends after it detects the first revolving signal. But due to the slow response of the machine, it might stops after the second or third revolving signal is detected, causing positioning error. Magnetic switch with poor sensitivity may cause incorrect zero return. | Select quality zero return switch. If it is mechanical switch, check its mechanic performance; if it is inductive switch, then select one with high sensitivity so as to make sure reliable zero return signal |
9.5 Breakdown 5: Unable to execute interpolation
| Breakdown Causes | Solutions |
| Execute interpolation by moving the planker | When execute interpolation by moving the planker, first use dial indicator. Compensate the backlash between two axes (adjust the machine if the backlash is too large), then use dial indicator to measure, execute tool changing in manual mode based on the input interpolation value, execute interpolation and cancel interpolation to change tool repeatedly, observe if the planker moves. If it moves, interpolation modification is effective, and the reason of ineffective interpolation is the machining workpiece is not in place after modifying interpolation, which further causes incorrect size. Check clamping jig or tool installation. |
| Execute interpolation by modifying coordinate | When execute interpolation by modifying coordinate, it is easy to judge as long as in manual mode, input interpolation and repeatedly change tool and cancel interpolation to change tool, observe if the coordinate value changes. Do subtraction between the values before and after change, see if the difference is exactly the interpolation value. If so, workpiece size is not correct after interpolation modification, causing the wrong judgement of non-interpolation. Check its machining process, clamping jig and tool. |
| While executing interpolation overlapping on 928TC, interpolation cannot be compensated to the original interpolation | Write down interpolation value, add several millimeters, clear the system interpolation and input interpolation again |