6. Siemens 3GG system data recovery
The Swiss STUDER s45-6 grinding machine is equipped with Siemens 3GG system. It is a double NC double PLC structure. The system has a strong self-diagnosis function. When a fault occurs, the screen prompt can be used to quickly diagnose and repair the fault. However, if the system fails to start, and the PLC is in a stopped state, the screen does not light, then the system's self-diagnosis function will not work, resulting in difficult diagnosis. There are many reasons for this failure. If the battery voltage is lower than 2.7V, the battery must be replaced. If the NC or PLC hardware is damaged, the circuit board needs to be replaced. If the 24V power supply of the machine is lower than 21V, check the power supply circuit and load.
But the more faults we encounter are not hardware failures, but soft faults such as machine data anomalies. The reasons are complicated. For example, grid interference, electromagnetic interference, battery failure, and operational errors may cause loss or confusion of machine data, so that the system cannot be started.
Like this kind of soft fault, we can use the full recovery method to make the system resume running. The steps for clearing the 3GG system are as follows:
(1) Clearance of machine data, user program, setting data and background memory;
(2) initialization of the 3GG system;
(3) PLC clearing;
(4) Restore all data and programs that have been cleared. Generally, you need to set the baud rate, call up 128KB of memory, and then input data and programs through media such as disk.
(5) Test and check the full KV coefficient of the servo system.
(6) After completing these steps, the system returns to normal.
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