Fault 7902 Siemens Patched Site

Fault 7902 on a Siemens drive is a critical safety fault. It specifically indicates a failure in the . When this error triggers, the drive enters a safe state and prevents the motor from running until the configuration is resolved. What is Fault 7902?

The you are using (TIA Portal Startdrive or STARTER) If you recently replaced any hardware or changed parameters

Parameter mismatch or unconfirmed safety configuration. fault 7902 siemens

Ensure the drive has been powered down for at least 5–10 minutes and the DC bus lights are off before performing physical checks.

Changing a control unit without running the safety synchronization. Step-by-Step Troubleshooting and Resolution Fault 7902 on a Siemens drive is a critical safety fault

To resolve the issue, follow these general steps:

You must copy the active safety parameters to the functional parameters to generate a new checksum. Set parameter (Copy safety parameters). Wait for the parameter to automatically reset to 0. 4. Perform a Save from RAM to ROM What is Fault 7902

Open your configuration tool (TIA Portal or Startdrive) and connect online to the drive. Go to the section. Locate the safety integrated commissioning parameter.

Execute a power cycle (turn the 24V DC supply off and on) or perform a safe acknowledge via parameter . Verification Checklist Value to Set Description p10 Enters Safety Commissioning p9700 Copies Safety Parameters p971 Saves RAM to ROM Memory p10 Returns to Ready State If youg., G120, S120, G120C)

Siemens drives require an explicit command to save volatile memory to non-volatile memory. Set parameter (Save from RAM to ROM). Alternatively, click the RAM to ROM icon in TIA Portal.