Hardware Overcurrent

What does F12 mean?

This fault indicates an excessive current condition detected by the drive's hardware. Potential causes include excessive motor load, incorrect DC boost settings, or excessively high DC brake voltage.

• Direct short circuit on the drive output terminals (U, V, W) or within the motor windings, causing an instantaneous current surge.
• Rapid acceleration or deceleration of a high inertia load without adequate ramp times (e.g., P003 [Accel Rate 1], P004 [Decel Rate 1]).
• Incorrect motor parameters or tuning settings (e.g., P010 [Boost] set too high) leading to excessive current during starting or load changes.
• Failure of the drive's internal IGBTs (Insulated Gate Bipolar Transistors) or output power stage components.
• Severe ground fault on the motor cable or within the motor itself that manifests as an instantaneous overcurrent.

Click steps to track your progress.

1. 1

   Disconnect the motor cables (U, V, W) from the drive output terminals. Perform an insulation resistance test (megger) on the motor and motor cable between phases and to ground.

2. 2

   Verify drive parameters P003 [Accel Rate 1] and P004 [Decel Rate 1] are set appropriately for the load inertia, increasing them if necessary.

3. 3

   Check parameter P010 [Boost] and P030 [Motor FLA] for correct settings relative to the motor nameplate and application requirements.

4. 4

   Inspect the motor connections at the drive and motor terminal box for loose strands or accidental shorts between phases or to ground.

5. 5

   Temporarily disconnect the motor and cable from the drive and attempt a test run without a motor to diagnose if the fault is internal to the drive (only if manual permits).