Power Wiring Error (Adv. Code 1)

What does 31 mean?

This fault occurs if an IOC (Internal Overcurrent) fault is detected during the power wiring test, indicating a problem with the drive's power wiring. This signifies a serious wiring discrepancy or an internal component issue that could lead to immediate overcurrent conditions and damage.

• Short circuit between motor output phases (U, V, W) or from any output phase to ground.
• Incorrect connection of input power wiring to output terminals (L1, L2, L3 accidentally connected to U, V, W).
• Damage to the motor cable or motor windings creating a low resistance path detected during the initial self-test.
• Internal drive hardware fault in the current sensing circuit or IGBTs detected during the pre-charge sequence.

Click steps to track your progress.

1. 1

   1. Power down the drive. Disconnect motor wires from drive output terminals U, V, W.

2. 2

   2. Measure resistance between each drive output terminal (U-V, V-W, U-W) and from each terminal to the drive's protective earth ground, expecting infinite resistance (open circuit).

3. 3

   3. Verify input power (L1, L2, L3) is correctly connected to the designated input terminals and not accidentally cross-wired to output terminals.

4. 4

   4. Perform a resistance test on the motor windings (U-V, V-W, U-W) and from each motor lead to its frame ground, ensuring no shorts (expected values typically 0.1-10 ohms).

5. 5

   5. If all external wiring checks pass and the fault persists without the motor connected, the drive likely has an internal hardware fault and requires replacement.