Siemens Drive Fault Code 7902 May 2026

This report provides a comprehensive overview of the Siemens Fault Code 7902 (F07902), often occurring in SINAMICS G120XA, G120, and S120 drives. 1. What is Fault F07902?

Siemens Drive Fault Code 7902 Report

1. Overview

• Fault Code: 7902
• Associated Drives: Common in SINAMICS G120, G120C, G120D, and S120 series (via PROFIBUS/PROFINET control)
• Fault Class: Communication / Fieldbus error
• Default Reaction: Drive trips (Fault), motor coasts or stops according to p2100/p2101 settings

Result: The drive stops operating (OFF2 or OFF3 depending on configuration) to protect the motor and mechanics. 2. Common Causes siemens drive fault code 7902

Step 2: Electrical Measurements (Disconnect Power)

Use a digital multimeter and, if available, a megohmmeter. This report provides a comprehensive overview of the

3. Immediate Actions

When fault 7902 appears:

7. When to Contact Siemens Support

Gather the following before calling:

• Set p2100[0] = 7902 and p2101[0] = 1 → No trip, only alarm (A07902).
• Set p2101[0] = 2 → Warning and reduce current (p0610 automatically activated).

Incorrect Motor Data: The drive's parameters do not match the physical motor plate (incorrect Fault Code: 7902 Associated Drives: Common in SINAMICS

6. Preventive Measures

• Set p2040 to 150–300 ms (long enough to tolerate bus jitter, short enough to detect real loss).
• Enable "follow-on fault" reaction (e.g., p2100 = 7902, p2101 = 3 → trigger different response if needed).
• Use PROFIsafe for safety-related drives – do not simply increase timeouts arbitrarily.
• Regularly monitor bus diagnostics (r2060, r2074 for PROFIBUS, r2080 for PROFINET counters).