VFD-rated motor cable
First part to price when insulation damage or output-cable leakage is found.
ABB ACS580 Fault 2330, What It Means
ABB ACS580 Fault 2330 is an Earth Leakage / Ground Fault trip. The drive has detected current leaking from one of the output phases to ground, or a phase-current imbalance severe enough to look like a grounded motor circuit. In real plants, Fault 2330 usually means moisture in the motor, damaged VFD cable insulation, contamination in the motor junction box, or a winding starting to fail under PWM stress.
This is not a nuisance fault to keep resetting. If you keep restarting into a grounded motor circuit, you can take out the drive’s output transistors.
Common Causes
- Moisture in the motor or peckerhead. Washdown areas, cooling tower pumps, rooftop fans, and outdoor conveyors often trip 2330 after water intrusion.
- Damaged VFD output cable. Nicked insulation, tray abrasion, or liquid ingress into splices can leak current to ground.
- Motor winding insulation breakdown. Older motors may ohm out “fine” with a basic meter but fail a proper megger test.
- Contamination in the terminal box. Carbon dust, oil, coolant mist, or conductive residue can create a leakage path.
- Output components wired incorrectly. Output reactors, sine filters, or brake wiring issues can mimic a ground-fault condition.
- Internal drive damage. If 2330 remains with the motor leads removed, the output stage or current sensing circuit may be damaged.
Step-by-Step Fix
- Lock out power and disconnect the motor leads from the drive. Remove U, V, and W from the ACS580 output terminals before testing. Never megger a motor circuit while it is still connected to the drive.
- Megger the motor cable to ground. Test each phase conductor to ground at 500V or 1000V, depending on the motor and plant standard. A weak or unstable reading points to cable damage or moisture contamination.
- Megger the motor separately. Isolate the motor from the cable and test the windings phase-to-ground. If the cable passes but the motor fails, you found the problem. For many maintenance teams, anything under 1 MΩ on a production motor is already a serious red flag.
- Inspect the motor junction box and conduit entries. Look for condensation, oil, cracked grommets, loose lugs, or carbon tracking. Dry and clean the box before retesting.
- Check for cable routing and shielding issues. VFD cable run next to sharp metal edges or sitting in wet tray is a common repeat offender. Replace damaged sections with proper VFD-rated cable.
- Power the drive with the motor still disconnected. If Fault 2330 clears with the motor circuit removed, the fault is downstream of the drive. If 2330 remains, suspect the ACS580 output stage or sensing hardware.
- Inspect any output reactor or filter. If the installation uses an output choke, du/dt filter, or sine filter, inspect those components and their wiring for insulation breakdown.
- Reconnect and test under no-load conditions. If possible, uncouple the motor from the load and run at low speed first. Watch for the fault returning as the motor heats up, which often points to winding insulation failure.
Parts Often Needed
| Part | Notes |
|---|---|
| VFD-rated motor cable | Replace damaged or moisture-soaked output cable |
| Insulation resistance tester (megohmmeter) | Required to prove whether the cable or motor is leaking to ground |
| Replacement 3-phase motor | Needed when winding insulation is breaking down |
| Motor terminal block / junction box parts | Useful when the fault is caused by contamination or loose terminals |
| Output reactor | Helps protect long motor leads and reduces stress on older motors |
Technician Tips
When diagnosing VFD faults, always check the drive’s fault history before resetting. Modern drives store the last 5-10 faults with the drive state at the time (running, accelerating, decelerating, stopped). An overcurrent fault that occurs only during acceleration points to incorrect motor data or mechanical binding. The same fault during deceleration suggests regeneration issues. A ground fault that clears after disconnecting the motor and returns when reconnected means the motor or cable insulation has failed.
Prevention: Schedule annual infrared scanning of drive cabinets. Loose power connections and failing capacitors produce heat long before they cause faults. A 5-minute scan can prevent hours of unplanned downtime.
Need Replacement Parts?
Before ordering, match the drive part to the model number, electrical rating, and failure symptom. Check current prices on Amazon - prices and availability change frequently.
When to Call a Professional
Call an ABB drive specialist if Fault 2330 stays active with the motor leads removed, if the drive faults immediately at enable with a known-good motor circuit, or if you suspect an IGBT failure. At that point you are beyond normal field wiring troubleshooting and into bench-level drive diagnostics.
See Also
- ABB ACS355 Fault 2330, Earth Leakage Causes and Fix
- ABB ACS580 Fault 3130, DC Bus Undervoltage Fix
- ABB ACS880 Fault 2310 Overcurrent, Causes and Fix
- ABB VFD Fault 3210, Output Phase Loss Guide