Siemens Drive Fault Code 7902

Siemens drive fault code 7902 (or F07902) indicates that the motor has stalled

4. Parameterization or Configuration Issues (Rare but Possible)

Fault code 7902 in Siemens drives typically indicates a specific issue related to the drive's operation. The exact meaning can vary slightly depending on the specific model and version of the Siemens drive. However, generally, this code points to a problem that requires attention to prevent further issues or damage to the drive and connected equipment. siemens drive fault code 7902

• Fault Code: 7902 (decimal) / 0x1EDE (hex)
• Standard Fault Text: "Timeout waiting for telegram from fieldbus"
• Drive Series: SINAMICS (most common), MASTERDRIVES MC/VC
• Severity: High (usually results in drive shutdown – OFF2)

• p2040 (PROFINET watchdog time): This parameter defines how long the drive waits for a telegram before faulting. If the network is slow, increasing this slightly might help, but usually, the default (approx. 100ms or so) is sufficient.
• r2040/r2041: Check these read-only parameters to see if the drive "sees" the PLC master. If the "Master IP" or "Station Name" is missing, the drive cannot establish a connection.

Scenario:

A automotive paint line conveyor trips with F07902 every Monday morning but runs fine for the rest of the week. Siemens drive fault code 7902 (or F07902) indicates

Reset

If the fault occurs on a SINAMICS G120XA, follow this Siemens recommended procedure : the converter to factory settings. Set (V/f) or (Vector). Enter motor nameplate data ( p0304p 0304 p0311p 0311 Set (Quick commission). Set (Ident. at standstill). Start the motor in Hand mode to run the motor ID. Critical Parameters to Review p0346p 0346 Fault Code: 7902 (decimal) / 0x1EDE (hex) Standard