Yaskawa GA800 F019 Fault — What It Means
The fault code F019 is not defined in the Yaskawa GA800 VFD fault code system. F019 is a ground short circuit fault used by Schneider Electric ATV310 and ATV610 drives, not Yaskawa equipment. The Yaskawa GA800 uses different fault codes, typically two-character alphanumeric codes such as OC1 (overcurrent), UV1 (undervoltage), SC1 (ground fault), and TH (thermal alarm). If you see F019 displayed on a Yaskawa GA800, verify that the drive is actually a Yaskawa model and consult the Maintenance & Troubleshooting Manual for the correct fault code list. Applying Schneider-specific troubleshooting to a Yaskawa drive can lead to incorrect diagnosis and unnecessary component replacement.
If you have a Schneider ATV drive displaying F019, the code indicates the drive detected a short circuit between the motor winding and ground. This is a critical protective fault that prevents damage to the drive and motor. Common triggers include motor insulation breakdown, damaged power cables, moisture contamination, or wiring errors that create an unintended ground path.
Before You Replace Anything
Technicians sometimes replace the motor when F019 appears on Schneider drives, but the fault can be caused by damaged cables or loose connections. Always measure insulation resistance on the motor and cables separately before ordering a new motor.
Common Causes
- Wrong Drive Brand (~40%) F019 does not exist in Yaskawa GA800 documentation and belongs to Schneider ATV drives, so the fault code may be misread or the drive is not the model you think it is.
- Motor Winding Insulation Failure (Schneider) (~25%) Internal insulation breakdown in the motor creates a short to ground, triggering F019 on Schneider drives.
- Damaged Power Cable Insulation (Schneider) (~20%) Worn, cut, or degraded cable insulation exposes conductors and creates a ground path.
- Moisture or Contamination (Schneider) (~10%) Water, oil, or conductive debris in the motor or cable enclosure creates a ground fault.
- Megger Test Damage (~5%) Using an insulation resistance tester on the drive output can damage internal components and create false ground faults, which Yaskawa explicitly prohibits.
Quick Diagnosis
Answer these to narrow it down fast.
Does the drive nameplate say Yaskawa GA800 or Schneider ATV?
No: Verify the drive model and consult the correct manual for that brand before proceeding.
Are there visible signs of cable damage, moisture, or burn marks near the motor or drive output terminals?
No: Move to insulation resistance testing of the motor and cables to find the ground fault source.
When you measure insulation resistance on the motor (disconnected from the drive), is it below 1 megohm?
No: The fault is likely in the cables, connectors, or drive itself. Inspect wiring and test cable insulation resistance separately.
Step-by-Step Fix
- Power down and lock out the drive at the main disconnect. Verify zero voltage on the input and output terminals with a multimeter.
- Verify the drive brand and model by reading the nameplate. Confirm whether the drive is a Yaskawa GA800 or a Schneider ATV series. F019 only exists on Schneider drives.
- Disconnect the motor cables at the drive output terminals (U, V, W). Inspect all connections for loose terminals, exposed wire, or signs of arcing.
- Inspect the motor and cables for physical damage, moisture, oil, or debris. Look inside the motor junction box and along the cable run for contamination or insulation wear.
- Measure insulation resistance on the motor only (not the drive). Use an insulation resistance tester (megger) to check resistance from each motor winding to ground. Typical acceptable resistance is 1 megohm or higher, but consult your motor’s datasheet for the specific threshold.
- Test cable insulation separately. Disconnect the motor and measure insulation resistance on the power cables from each conductor to ground.
- Replace faulty components. If motor insulation is below acceptable limits, replace or rewind the motor. If cable insulation is damaged, replace the power cable. If connections are loose or corroded, clean and re-torque terminals to manufacturer specs.
- Reconnect and test. Reconnect the motor, restore power, and clear the fault per the drive manual. Run the motor at low speed and monitor for recurring faults.
Parts Often Needed
| Part | Notes |
|---|---|
| Motor power cable (3-conductor shielded) | Amazon | Choose cable rated for VFD output and the motor’s voltage and current |
| Motor (matching frame size and rating) | Amazon | Only replace if insulation resistance test confirms winding failure |
When to Call a Pro
Call a qualified electrician or VFD technician if you are not trained to work with three-phase power or VFD systems. High-voltage work on drive outputs and motor circuits requires specialized knowledge of ground fault protection, insulation testing, and proper lockout/tagout procedures. If insulation resistance testing shows intermittent faults or if the fault persists after replacing cables, the drive itself may have internal damage that requires factory service or replacement. Never attempt to megger-test the drive output terminals, as this will destroy the drive’s output stage.
Rough cost: A pro service call runs about $200-500.