Input accurate nameplate values for voltage ( p304 ), current ( p305 ), and speed ( p311 ).
: The drive's current limits (p0640) are set too low to allow the motor to magnetize or overcome the starting torque. Flying Restart siemens drive fault 7902
The difficulty in resolving Fault 7902 lies in its binary nature: the drive simply states, "I cannot talk to the controller." It does not inherently specify why the communication stopped. The root cause could be as simple as a loose cable or as complex as a failing electronic component. Input accurate nameplate values for voltage ( p304
The Siemens drive fault code (often displayed as 7902 ) indicates a "Motor Stalled" condition. This fault occurs when the drive identifies that the motor has remained in a stalled state for a duration longer than the time set in the delay parameter. The root cause could be as simple as
: The motor nameplate parameters (e.g., current, power, speed) were not entered correctly during commissioning. Encoder Issues
Do not clear the fault and restart. Follow this systematic workflow.