The encoder the axis is using for position has a hardware problem: signal lost, cable fault or a failed encoder.
What causes Siemens alarm 25000?
Damaged encoder cable. Coolant in a connector. Failed motor encoder or scale.
How do I fix Siemens alarm 25000?
Note the axis. Check the cable and connectors. Encoder and cable replacement needs a tech, and the axis reference may need setting again.
Alarm numbers and text can differ by control model, software version and machine builder. This page is a starting point from people who have worked on these machines, not a replacement for your machine builder's manual.
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