Siemens Drive Fault Code 7902 Review

Fault code (or F07902 in SINAMICS G120XA converters) is a common, yet critical, error in Siemens drive systems, indicating that the motor has stalled or is blocked. This fault signifies that the motor is receiving power but is not achieving the speed commanded by the inverter, leading to a protective shutdown.

If you'd like to share and what type of load you are running, I can offer more tailored advice on speed controller tuning or potential mechanical pitfalls. sinamics drive motor fault 7902 - SiePortal - Siemens

: A factory-default or user-defined maintenance interval timer has run down to zero. siemens drive fault code 7902

The threshold speed for stall detection (p2175) or the stall delay time (p2177) may be configured too aggressively for the specific application. 3. Motor and Control Mode Mismatches

If the system uses closed-loop vector control, a malfunctioning encoder, loose coupling, or damaged feedback cable can report an incorrect speed of "0 RPM" to the drive, tricking it into triggering a stall fault. Fault code (or F07902 in SINAMICS G120XA converters)

The first action is to check the fault value stored in parameter r0949 . This decimal number tells you which detection mechanism triggered the fault:

If the fault occurs when trying to start a motor that is already spinning (coasting), enable the "Flying Restart" function ( Adjust Fault Limits: sinamics drive motor fault 7902 - SiePortal -

One phase of the motor is not getting power.