Siemens F002 Fault ((exclusive)) ◎

It is crucial to distinguish F002 from F001 (Overcurrent). While both relate to current, F001 usually involves a short circuit between phases or a massive mechanical overload. F002 specifically implies a leakage path to the earth ground.

This happens when the motor is being forcibly rotated by the load faster than the commanded speed. The motor acts like a generator, sending energy back into the drive’s DC link. siemens f002 fault

Many Siemens drives have an optional braking resistor to burn off regenerative energy. It is crucial to distinguish F002 from F001 (Overcurrent)

| Cause | Solution | |-------|----------| | Short ramp-down time | Increase p1121 (ramp-down time). For high inertia loads, extend significantly. | | Overhauling load | Enable or regenerative infeed . For temporary fixes, increase p1240 (Vdc controller) to dynamic limiting. | | Braking resistor missing | Install an external braking resistor matched to drive power and duty cycle. | | Braking resistor failed | Replace resistor. Verify internal thermal switch (if present) is closed. | | Line overvoltage | Install line reactor (power quality filter) or adjust transformer taps upstream. | | Vdc controller disabled | Enable Vdc max controller (p1240 = 1, 2, or 3 depending on drive type). This extends ramp-down time automatically. | | Active infeed issue | Check infeed parameterization (p3533, p3513). Ensure regenerative mode is active. | This happens when the motor is being forcibly

Sometimes the drive itself is the problem. If the voltage sensing circuit (opto-couplers, resistors) or the braking chopper circuit fails, the drive either misreports a fault or cannot bleed off excess voltage.

While most F002 faults are solvable in-house, contact Siemens if:

Contrary to popular belief, the F002 fault rarely means "the incoming power is too high." While that is possible, the most common culprit is actually the motor acting as a generator. Let’s break down the three primary sources: