Allen‑Bradley 20G11NC011AA0NNNNN AC Drive

PowerFlex 755 Air-Cooled AC Variable Frequency Drive (VFD)

Lifecycle: Obsolete (Last order date: 2024‑06‑30). Direct OEM replacement part number: 20G11NC011JA0NNNNN

1. Catalog Number Breakdown (20G Series Coding Rule)

20G 1 1 N C 011 A 0 NNNNN

2. Key Electrical Specifications

Rated Current: 11.5A

Voltage Class: 3-phase 400V AC

Power Rating:

ND (Normal Duty): 5.5kW

HD (Heavy Duty): 4kW

Frame Size: Frame 2

Cooling: Forced air cooling

Communication: Embedded EtherNet/IP (DLR ring support)

Dynamic Braking: Built-in DB transistor, external braking resistor required

Enclosure Rating: IP20 (for cabinet mounting only)

Input: AC main circuit with brought-out DC bus terminals, suitable for common DC bus applications

3. Typical Applications

Conveyors, fans, pumps, extruders and general-purpose industrial motor speed control; supports multi-axis EtherNet/IP motion control and can share the same network with Kinetix servo drives.

4. Hardware & Maintenance Notes
5. Obsolete notice: After discontinuation of AA0 suffix legacy units, JA0 is the drop-in compatible replacement. Mounting dimensions, I/O and program parameters are fully compatible for direct replacement.
6. Optional Accessories: HIM keypad (20‑750‑HIM), input EMC filter, dynamic braking resistor, Safe Torque Off (STO) module.
7. Common failure points: Fan aging, DC bus capacitor degradation, ESD damage on EtherNet/IP port; for spare part replacement, prioritize OEM JA0 version.
8. Domestic Alternative Reference (Same rating 400V /11.5A VFD)

Inovance MD880, V&T AC800, Xinje DS500. Hardware replacement is feasible, but communication program, parameter groups and terminal definitions require re-commissioning. Cannot directly inherit the original Rockwell EtherNet/IP motion link.

6. HS Code Reference

8504409990 (Other static converters, general classification for VFDs. Final customs classification subject to local customs authority.)

PowerFlex755 (20G11NC011AA0NNNNN) Power-On Commissioning Parameter List

Applicable: 400V, ND 5.5kW / HD 4kW, embedded EtherNet/IP, integrated braking transistor. Structure: Pre-power-on inspection → Factory reset → Motor nameplate data → Control mode → Start / Speed reference source → Accel/Decel & limits & protection → Autotune → EtherNet/IP communication → Dynamic braking & fault strategy → Monitoring parameters

Note: Parameter numbers refer to Port0 (drive native parameters). Actual values from motor nameplate must be entered on site. Italic values below are examples.

1. Pre-Power-On Hardware Check (Not parameters, mandatory before commissioning)
2. Main circuit: 3-phase input R/S/T, output U/V/W, DC bus, braking resistor wiring and earthing.
3. Control circuit: 24V control supply, STO safety terminals must be shorted (short required if no STO module, otherwise safety fault alarm).
4. Motor decoupling recommended: Disconnect mechanical load before initial autotune.
5. Rating verification: Drive rated 11.5A, match motor rated current.
6. Factory Reset (New project / After repair)

3. Motor Nameplate Parameters (Critical, enter from nameplate)

4. Control Mode (TotalFORCE, for induction motors)

5. Command Source & Speed Reference Source (Select ONE: Terminal Control / EtherNet/IP Network Control)

Option A: EtherNet/IP Network Control (Built-in port standard on this unit, most common for projects)

Option B: Local Terminal Control (Commissioning test / Standalone test)

6. Accel / Decel & Limit Parameters

7. Current / Torque Protection Parameters

8. Motor Autotune (Critical! Run after entering nameplate data)

After successful autotune, parameter 70 automatically returns to Ready 0. If autotune fails, check wiring, nameplate entries and short-circuit to earth.

9. Embedded EtherNet/IP Communication Parameters (Port13 Embedded Adapter)

Hardware DIP switch: All DIPs set to 0 to allow software-configured IP. If DIPs are non-zero, IP is determined by hardware switches.

10. Dynamic Braking Parameters (A suffix = integrated DB transistor on this model)

11. Auto Restart on Fault (Optional, safety hazard risk)

12. Read-only Monitoring Parameters (For observation only, no write)

13. Standard Commissioning Procedure
14. Power off → Factory reset parameters → Apply power
15. Enter all motor nameplate parameters
16. Configure control mode, command source and reference source
17. Set accel/decel, limits and overload protection
18. Run motor autotune with load decoupled, confirm autotune success
19. EtherNet/IP: Set IP address, download PLC project, establish I/O connection
20. No-load jog test, verify rotation direction, current and speed
21. Loaded trial run, fine-tune accel/decel and torque limits
22. Save parameters to drive (parameter backup), export via Studio5000
23. Record and archive full parameter set
24. Common Commissioning Pitfalls
25. STO safety terminals: 20G11NC011AA0NNNNN has no STO module; STO jumpers on control board must be shorted, otherwise safety fault on power-up.
26. Autotune fault: Check for open 3-phase motor wiring, nameplate data entry and earth short circuit.
27. Replacement 20G11NC011AA0NNNNN → 20G11NC011JA0NNNNN: Parameters can be uploaded/downloaded directly, nearly fully compatible; only verify firmware version.

4. High inertia loads: Extend deceleration time or select higher rated braking resistor