Short circuit

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A short-circuit condition is detected either in the motor windings or within the motor wiring connecting to the frequency converter. This poses a significant risk of damage to the drive and motor if not resolved.

• Phase-to-phase short-circuit within the motor windings.
• Short-circuit between two or more motor output phases in the motor cable (e.g., U-V, V-W, U-W).
• Mechanical damage to the motor cable causing direct contact between phase conductors.
• Water ingress or severe contamination in the motor terminal box creating a conductive path between phases.
• Internal fault within the drive's output stage (e.g., failed IGBT module, gate drive circuit failure).

Klikk på steg for å spore fremgangen.

1. 1

   Power down the drive and disconnect the motor leads (U, V, W) from the drive's output terminals.

2. 2

   Use a multimeter to measure the resistance between each pair of motor phases (U-V, V-W, W-U) for both the motor cable and motor windings. Look for resistance values close to zero Ohms.

3. 3

   Inspect the entire length of the motor cable for severe physical damage, crushing, or cuts that could cause phase-to-phase contact.

4. 4

   Open the motor terminal box and inspect for moisture, carbon tracking, or debris bridging terminals.

5. 5

   If the motor and cable show no short-circuit, the fault likely lies within the drive's power section (e.g., IGBT module), requiring service.