Saturation trip

What does 7 mean?

This fault indicates a severe internal component defect, potentially related to a short-circuited or overloaded brake resistor. It's a critical fault that prevents normal drive operation and requires immediate, specialized attention. Attempting to restart the drive or reconnect power without addressing the root cause risks further catastrophic damage to the unit.

• Internal short circuit in the drive's power semiconductor devices (IGBTs) due to overload, overheating, or manufacturing defect.
• Short circuit in the external braking resistor or its connecting cables to the drive (R+/RB terminals), leading to excessive current flow.
• Drive output terminals (U, V, W) shorted to each other or to ground due to cable damage or contamination.
• Malfunction of the internal current measurement circuit or protection logic.
• Extreme motor overload condition causing sustained current significantly above the drive's capacity, leading to immediate trip.

Click steps to track your progress.

1. 1

   Disconnect the motor cables from the drive's output terminals (U, V, W) and the braking resistor from R+/RB terminals.

2. 2

   Perform a diode test on the drive's output IGBTs (between DC+ and U/V/W, and DC- and U/V/W) using a multimeter in diode mode, comparing readings against specifications.

3. 3

   Measure the resistance of the external braking resistor (if installed) using a multimeter and compare it to the specified value. Check for short circuits in its wiring.

4. 4

   With motor and brake resistor disconnected, apply power to the drive and attempt a start command without load. If the fault persists, the drive is likely defective.

5. 5

   Inspect the drive's internal components for any visible signs of arcing, burning, or component damage.

6. 6

   Verify that no conductive debris or foreign objects are present inside the drive.