20G11ND030AA0NNNNN Replacement Guide — PowerFlex 755

In Short

The 20G11ND030AA0NNNNN is a 20 HP / 15 kW (30 A normal duty), 380–480 V AC, 3-phase PowerFlex 755 AC drive, Frame 2, NEMA Open / IP20. If yours has failed, the direct-form-fit replacement is another 20G11ND030AA0NNNNN. Functional alternates include 20G11NC030AA0NNNNN (same rating, different option configuration). PALM Parts Solution stocks new, refurbished, and surplus units with a 1-year warranty and same-week dispatch.

Symptoms (when this unit needs replacement)

• Repeated trips on F005, F006 after a full power-cycle and parameter reset
• DC bus capacitor bulge or electrolyte leakage on the back of the chassis
• Cooling fan stall with subsequent IGBT overtemp shutdown
• Loss of EtherNet/IP heartbeat to the ControlLogix/CompactLogix master
• Smoke or burnt-PCB odor from the heatsink vents (replace immediately — do not power on)

Causes

• DC bus capacitor aging — typical 7–10 yr life at 40°C ambient; common after a long idle period followed by re-energization
• IGBT module failure from sustained operation near thermal limits or undersized line reactor
• Single-phase input caused by a blown upstream fuse — drive runs but trips on overload/overcurrent under load
• Firmware corruption after a brownout during a flash update
• Cooling fan EOL — bearing wear; once airflow drops below spec the drive thermal-trips

Troubleshooting before you replace

1. Record the active fault code and the value of parameter P947 (last 8 faults). Cross-reference to: F005, F006, F012, F081.
2. Measure all three input phases at the drive terminals — a missing phase masquerades as overcurrent.
3. Disconnect the motor and run the drive in no-load / sensorless test mode. If it still trips, the fault is internal.
4. Inspect DC bus capacitors visually; check bus voltage at the test points (≈ 1.41 × line voltage).
5. Verify cooling fan rotation and inlet temperature; clear heatsink debris.
6. If the drive faults only over the network, isolate by running from the local HIM and confirm the issue is comms, not power.

Replacement Options

Related Products (internal links)

• All in-stock 20G11ND030AA0NNNNN units → /product/20g11nd030aa0nnnnn
• 20G11NC030AA0NNNNN listings → /product/20g11nc030aa0nnnnn
• 20F11ND030AA0NNNNN listings → /product/20f11nd030aa0nnnnn
• Full PowerFlex 755 catalog on PALM

Related Manufacturer Hub & Category

• Manufacturer hub: Allen-Bradley
• Category page: Drives
• Family page: PowerFlex 755

FAQ (FAQPage schema)

Q: Is 20G11ND030AA0NNNNN discontinued?
A: The PowerFlex 755 platform remains active in the Rockwell catalog at the time of writing, but specific option-string SKUs are reaching end-of-life. PALM Parts Solution stocks new, refurbished, and surplus 20G11ND030AA0NNNNN units to keep your machine running until you plan a controlled migration.

Q: What is a direct drop-in replacement for 20G11ND030AA0NNNNN?
A: Another 20G11ND030AA0NNNNN with matching firmware family is the only true drop-in. The closest functional alternate is 20G11NC030AA0NNNNN — same 20 HP / 15 kW rating, different option configuration. Plan parameter file transfer either way.

Q: Will a PowerFlex755 parameter file from my old drive load into the new one?
A: Yes, when the firmware major revision matches. Use Connected Components Workbench or DriveExecutive to save the .dno file from the old drive, then download to the replacement. Verify motor nameplate parameters before the first run.

Q: How is 20G11ND030AA0NNNNN rated — heavy duty or normal duty?
A: This catalog code is rated for 30 A normal duty (20 HP / 15 kW) at 380–480 V AC, 3-phase. For 150% overload applications (conveyors, hoists, positive-displacement pumps) confirm the heavy-duty column on the Rockwell selection guide.

Q: What does the most common F005 fault on this drive indicate?
A: F005 is typically caused by regenerative energy during deceleration, an oversized DC bus capacitor bank degrading, or input overvoltage. Confirm deceleration ramp and add a brake resistor or dynamic brake module when the load has inertia.