Troubleshooting Multi-Servo Er150/Er151 Errors

Er150: Encoder signal loss / synchronization error (e.g., pulse signal interruption, phase deviation).

Er151: Excessive encoder signal noise / abnormal fluctuation (e.g., misjudgment caused by interference).

Both alarms are directly related to encoder signal stability, and the "alarms from non-activated drives" indicate systemic interference (e.g., electromagnetic coupling between multiple devices).

Recommendations: Prioritize hardware and wiring inspection (the most likely root cause):

1. Ensure all components with grounding terminals in the electrical cabinet are properly connected to the grounding terminal, and the entire cabinet is reliably grounded.
2. Specifically check if encoder cables are routed adjacent to or share conduits with high-voltage/high-frequency equipment. Separate and optimize cable routing before retesting.

Updated on: 30/10/2025