Allen-Bradley 20G11BC1K0JN0NNNNN
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The Allen-Bradley 20G11BC1K0JN0NNNNN is a PowerFlex 755 AC variable frequency drive manufactured by Allen-Bradley, a brand of Rockwell Automation. This unit belongs to the PowerFlex 750-Series product family, which is designed for demanding industrial motor control applications requiring high performance and flexibility. The PowerFlex 755 series is engineered for general-purpose and complex motion applications, providing precise control of AC induction and permanent magnet motors across a wide power range.
The PowerFlex 755 drive features an embedded EtherNet/IP communication port as standard, enabling seamless integration into Logix-based control architectures without the need for additional communication modules. The drive supports multiple control modes including sensorless vector, closed-loop vector with encoder feedback, and permanent magnet motor control. It incorporates an option card slot architecture that allows expansion with additional I/O, safety, feedback, and communication modules. The drive includes integrated safe torque-off (STO) capability as a standard safety feature, meeting SIL 2 and PLd requirements. The hardware is built for robust industrial environments with conformal coating options and a wide operating temperature range.
The PowerFlex 755 is widely deployed in industries such as oil and gas, mining, metals, water and wastewater, material handling, and pulp and paper. It is commonly used to control pumps, fans, compressors, conveyors, extruders, and winders where variable speed control and high dynamic performance are required. Its compatibility with Rockwell Automation's Integrated Architecture and Studio 5000 programming environment makes it a preferred choice in facilities already standardized on Allen-Bradley control systems.
Technical Specifications
| Series/Product Family | PowerFlex 755 (PowerFlex 750-Series) |
|---|---|
| Input Voltage | 600 V AC (3-phase) |
| Input Voltage Range | 540 – 660 V AC |
| Input Frequency | 47 – 63 Hz |
| Power Rating | 1000 kW (1350 HP) nominal |
| Output Current (Continuous) | 1180 A (Normal Duty) |
| Output Current (Peak) | 1298 A (110% for 1 minute, Normal Duty) |
| Control Type | Sensorless Vector, Closed-Loop Vector, V/Hz, Permanent Magnet Motor Control |
| Communication Interface | Embedded EtherNet/IP (dual-port) |
| Safety Features | Safe Torque-Off (STO), SIL 2, PLd (Cat. 3) |
| Feedback Interface | Incremental encoder, absolute encoder (via option module) |
| Operating Temperature | 0 – 50 deg C (derating may apply above 40 deg C) |
| Storage Temperature | -40 – 70 deg C |
| Relative Humidity | 5 – 95% non-condensing |
| IP/Protection Rating | IP00 / IP20 (chassis) |
| Mounting | Floor-standing / cabinet mount |
| Certifications | UL, cUL, CE, RCM |
Common Fault Codes
- Fault Code 12
- HW OverCurrent – The drive output current has exceeded the hardware overcurrent trip threshold.
Check motor and output wiring for short circuits or ground faults. Verify motor nameplate data matches drive configuration. Inspect load for mechanical jams or excessive inertia. - Fault Code 13
- Ground Fault – A ground fault has been detected on the drive output.
Disconnect motor and test insulation resistance of motor windings and output cables to ground. Replace damaged cables or motor if insulation has failed. - Fault Code 25
- Decel Inhibit – The drive is unable to decelerate at the programmed rate due to excessive bus voltage.
Increase deceleration time in the drive parameters. If dynamic braking is installed, verify the brake resistor and chopper are functioning correctly. Consider enabling bus voltage regulation. - Fault Code 29
- Analog Input Loss – An analog input signal has fallen below the minimum configured threshold, indicating a broken or disconnected signal wire.
Check wiring and signal source at the analog input terminals. Verify the signal is within the configured range. Adjust the loss-of-signal fault action parameter if a fallback behavior is preferred. - Fault Code 33
- Auto Restart Tries – The drive has exceeded the maximum number of automatic restart attempts following a fault.
Identify and resolve the root cause fault before resetting. Review the fault queue log in the drive. Adjust auto-restart parameters if the application requires more attempts. - Fault Code 63
- SW OverCurrent – Software-detected output overcurrent condition, typically caused by overloaded motor or incorrect motor parameters.
Verify motor parameters (nameplate FLA, voltage, frequency) are correctly programmed. Check for mechanical overload on the driven equipment. Review current limit settings. - Fault Code 71
- Power Loss – Input power loss has been detected, indicating a phase loss or significant voltage sag on the input supply.
Check all three input phases for correct voltage and balance. Inspect input fuses, contactors, and supply cabling. Verify utility supply stability. - Fault Code 122
- Safe Torque Off (STO) Fault – The safe torque-off function has been activated or a discrepancy has been detected in the STO circuit.
Verify that the STO input signals are correctly wired and that the safety circuit is energized as intended. Check for wiring faults or a tripped safety relay upstream. Inspect the STO option module if installed.
Frequently Asked Questions
What input voltage and power rating does the 20G11BC1K0JN0NNNNN correspond to?
The 20G11BC1K0JN0NNNNN is a PowerFlex 755 drive rated for 600 V AC three-phase input at approximately 1000 kW (1350 HP). This is a large frame, high-power unit intended for heavy industrial applications.
What communication protocols does the PowerFlex 755 support?
The PowerFlex 755 includes an embedded dual-port EtherNet/IP adapter as standard. Additional protocols such as DeviceNet, ControlNet, Profibus DP, and Modbus TCP can be supported through optional communication modules installed in the drive's option card slots.
Is the PowerFlex 755 compatible with permanent magnet motors?
Yes, the PowerFlex 755 supports permanent magnet (PM) motor control in addition to AC induction motors. The appropriate motor control mode must be selected in the drive parameters, and a compatible feedback device is typically required for closed-loop PM control.
Does this drive include integrated safety functionality?
Yes, the PowerFlex 755 includes a standard Safe Torque-Off (STO) function that meets SIL 2 and PLd (Category 3) requirements. Additional safety functions such as Safe Stop and Safe Speed Monitoring can be added via optional safety option modules.
Can the PowerFlex 755 be programmed using Studio 5000?
Yes, the PowerFlex 755 integrates with Rockwell Automation's Studio 5000 Logix Designer environment via EtherNet/IP, allowing parameter configuration, monitoring, and diagnostics from within the same programming environment used for Allen-Bradley PLCs.
Troubleshooting
Drive faults immediately on start command with an overcurrent fault
Check the output current waveform and verify motor parameters programmed in the drive match the motor nameplate. Inspect output cables and motor terminals for short circuits or ground faults using a megohmmeter.
Correct any motor parameter mismatches in the drive configuration. Repair or replace damaged output cables. If the motor insulation is degraded, the motor must be rewound or replaced before returning the drive to service.
Drive powers up but HIM (Human Interface Module) displays no information or remains blank
Check the HIM module seating and connector for damage or corrosion. Verify the internal 24 V DC power supply within the drive is functioning by measuring at the control board power terminals.
Reseat or replace the HIM module. If the internal power supply is faulty, the control power supply board or main control board may require replacement. Check for blown internal fuses on the control board.
EtherNet/IP communication is intermittent or fails to establish with the controller
Verify IP address configuration on the drive matches the expected network settings. Check the Ethernet cable, switch port, and link status LEDs on the drive's embedded Ethernet port. Review the controller's I/O tree for connection faults.
Reconfigure the drive IP address using the HIM or Rockwell Automation's Bootp/DHCP server tool. Replace the Ethernet cable if damaged. Ensure the network switch port is configured correctly and that no IP address conflicts exist on the network.
Drive runs but motor speed does not match the commanded reference
Verify the speed reference source parameter is configured correctly (e.g., analog input, network reference, or internal preset). Check analog input signal levels at the terminal block if an analog reference is used. Review the drive's speed feedback configuration if operating in closed-loop mode.
Correct the speed reference source and scaling parameters. Calibrate the analog input if the signal level is incorrect. If operating in closed-loop vector mode, verify encoder wiring, resolution settings, and feedback device health.
Drive trips on a thermal overload or overtemperature fault
Check the ambient temperature around the drive enclosure and verify that cooling fans are operating. Inspect air filters and heat sink fins for dust or debris blockage. Verify that the drive load current does not consistently exceed the programmed overload settings.
Clean or replace blocked air filters and heat sink fins. Ensure adequate ventilation in the enclosure and that ambient temperature is within the specified operating range. If cooling fans are not running, inspect fan power supply and replace faulty fans. Reduce load or increase deceleration time if thermal stress is load-related.
| Condition | Repair, Used, Refurbished, New in box (sealed) |
|---|
Common defects
Common defects on a Allen-Bradley 20G11BC1K0JN0NNNNN are:
Power Supply Related Issues
- No power / drive not turning on
- Blown fuses
- Defective rectifier bridge
- Damaged DC bus capacitors
- IGBT / MOSFET module failure
- Overvoltage / undervoltage errors
Control & Electronics Failures
- Faulty control board or PCB damage
- Firmware or memory corruption
- Fieldbus communication errors (Profibus, Modbus, EtherCAT, CANopen)
- Input / output circuit damage
- Gate driver module failure
Motor Control Problems
- Motor not starting or no output
- Unstable speed control
- No torque output
- Trip during acceleration or deceleration
- Encoder feedback errors
Thermal & Cooling Defects
- Overheating due to failed cooling fans
- Defective temperature sensors
- Poor heatsink performance
Mechanical & Environmental Damage
- Burnt or loose connectors
- PCB track damage
- Corrosion or moisture ingress
- Oil, dust or contamination damage
- Cracked solder joints
Error Codes & Drive Trips
- Overcurrent faults (OC)
- Ground fault / earth leakage error
- Short-circuit fault
- Motor or drive overload
- Overvoltage or undervoltage error
- Undervoltage trip when starting or stopping
- Phase loss / imbalance
- Synchronization issues with multiple drives
Other
- Display defect
- Control keys or keypad not working
- Parameters no longer readable or lost
- Brake resistor problems (brake chopper defect)
- Internal relays/contactors defective
- EMI/RFI interference due to defective filters
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