Allen-Bradley 20G1ALD617AN0NNNNN
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The Allen-Bradley 20G1ALD617AN0NNNNN is a PowerFlex 755 series AC variable frequency drive manufactured by Allen-Bradley, a brand of Rockwell Automation. This unit belongs to the PowerFlex 750 Series product family, designed for demanding industrial motor control applications requiring high performance and flexibility. The PowerFlex 755 is engineered for three-phase AC induction and permanent magnet motor control, offering advanced drive functionality in a scalable architecture.
The PowerFlex 755 series 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 volts-per-hertz control, providing flexibility across a wide range of motor types and application demands. An integrated safety option slot supports Safe Torque Off (STO) and other safety functions compliant with SIL 2 and PLd standards. The modular option card architecture allows for additional I/O, feedback, and communication expansion. The unit is built with a robust power structure suitable for continuous industrial duty cycles.
The PowerFlex 755 is widely deployed in industries such as oil and gas, mining, material handling, water and wastewater treatment, and heavy manufacturing. It is commonly used to control pumps, fans, compressors, conveyors, hoists, and extruders where precise speed and torque regulation are required. The drive's scalable design and broad communication capability make it suitable for integration into both standalone machine control and plant-wide networked automation systems.
Technical Specifications
| Series/Product Family | PowerFlex 755 |
|---|---|
| Input Voltage | 600 V AC (3-phase) |
| Input Voltage Range | 540 – 660 V AC |
| Output Current (Continuous) | 617 A |
| Power Rating | Approximately 450 kW (600 HP) at 600 V |
| Control Type | Sensorless Vector, Closed-Loop Vector, V/Hz |
| Communication Interface | EtherNet/IP (embedded), optional DeviceNet, ControlNet, Profibus DP |
| Feedback Interface | Incremental encoder, resolver (via option card) |
| Safety Features | Safe Torque Off (STO), SIL 2, PLd (via option module) |
| Operating Temperature | 0 to +50 degrees C (derating may apply above 40 degrees C) |
| Storage Temperature | -40 to +70 degrees C |
| Relative Humidity | 5 to 95% non-condensing |
| IP/Protection Rating | IP20 / NEMA Type 1 (standard enclosure) |
| Mounting | Floor-standing / cabinet mount |
| Certifications | UL, CE, RCM |
| Number of Axes | 1 |
Common Fault Codes
- Fault Code 2
- Auxiliary Input fault. An external fault signal has been received via the auxiliary input terminal or parameter configuration.
Check the wiring and signal source connected to the auxiliary input. Verify parameter settings for auxiliary input configuration and clear the fault once the external condition is resolved. - Fault Code 12
- HW OverCurrent fault. The drive output current has exceeded the hardware overcurrent trip threshold.
Check for a short circuit or ground fault on the motor output wiring. Verify motor and cable insulation resistance. Inspect for mechanical overload on the driven equipment. - Fault Code 13
- Ground Fault. Excessive current is flowing to ground on the drive output.
Disconnect the 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 fault. The drive is unable to decelerate at the programmed rate, typically due to excessive bus voltage during regenerative braking.
Increase the deceleration time parameter, install or verify operation of a dynamic braking resistor, or enable the bus voltage regulation feature in the drive parameters. - Fault Code 29
- Analog Input Loss. The analog input signal has fallen below the configured loss threshold, indicating a broken wire or signal source failure.
Check wiring continuity and signal source at the analog input terminals. Verify the signal level and configure the analog input loss action parameter appropriately. - Fault Code 33
- Auto Restart Tries fault. The drive has exceeded the maximum number of automatic restart attempts following a fault condition.
Identify and correct the root cause of the recurring fault before resetting. Review the fault queue log to determine the originating fault code and address accordingly. - Fault Code 71
- Power Loss fault. An input power loss or significant voltage sag has been detected on the AC input supply.
Check the incoming AC supply voltage for sags, interruptions, or phase loss. Verify fusing, contactor operation, and supply cable integrity upstream of the drive. - Fault Code 122
- Motor Overtemperature fault. The motor thermal model or a connected PTC/thermistor has indicated that the motor temperature has exceeded the allowable limit.
Allow the motor to cool before restarting. Check motor ventilation, load cycle, and ambient temperature. Verify thermistor wiring and parameter configuration for motor thermal protection.
Frequently Asked Questions
What is the continuous output current rating of the 20G1ALD617AN0NNNNN?
The 20G1ALD617AN0NNNNN is rated for 617 A continuous output current at 600 V AC, corresponding to approximately 450 kW (600 HP) of motor power.
What communication protocols does the PowerFlex 755 support?
The PowerFlex 755 includes an embedded EtherNet/IP port as standard. Additional protocols such as DeviceNet, ControlNet, and Profibus DP can be added via optional communication modules installed in the drive's option card slots.
Does this drive support Safe Torque Off (STO) safety functionality?
Yes, the PowerFlex 755 supports Safe Torque Off (STO) and other safety functions up to SIL 2 and PLd through a dedicated safety option module. The base drive includes a hardwired STO input as standard.
Can the PowerFlex 755 control permanent magnet motors as well as induction motors?
Yes, the PowerFlex 755 supports control of both AC induction motors and permanent magnet motors. Closed-loop vector control with encoder or resolver feedback is available via option cards for high-performance applications.
What input voltage supply is required for the 20G1ALD617AN0NNNNN?
This unit is designed for a 600 V AC three-phase input supply, with an acceptable operating range of approximately 540 to 660 V AC. Ensure the supply voltage is within this range before commissioning.
Troubleshooting
Drive displays a Ground Fault (Fault Code 13) immediately on start command
Disconnect the motor output cables from the drive terminals U, V, W and attempt to run the drive unloaded. If the fault clears, the issue is in the motor or output cabling. Measure insulation resistance from each output phase to ground using a megohmmeter at 500 V DC.
Replace damaged output cables or the motor if insulation resistance is below 1 MOhm. If the fault persists with no motor connected, the drive output power module may be damaged and require replacement or professional repair.
Drive powers up but does not respond to start command
Check the drive status display for any active faults or inhibits. Verify that the control source and reference source parameters are configured correctly for the intended control method (terminal block, HIM, or network). Confirm that the enable input and any hardwired permissives are satisfied.
Clear any active faults via the HIM or parameter reset. Verify digital input wiring and parameter assignments for the start, enable, and direction commands. Ensure the drive is not in a faulted or inhibited state due to an unsatisfied interlock.
Excessive motor heating during operation at low speeds
Verify that the motor cooling method is adequate for variable speed operation. Check the drive's motor thermal model parameters and confirm that the motor nameplate data has been entered correctly. Review the load duty cycle and current draw at low speed.
Enable the drive's IR compensation and slip compensation features for improved low-speed torque. If the motor relies on shaft-mounted cooling, consider adding a separately powered cooling fan. Adjust the motor overload parameters to match the motor's actual thermal characteristics.
EtherNet/IP communication loss between drive and PLC controller
Check the physical Ethernet connection, cable integrity, and switch port status. Verify the drive's IP address, subnet mask, and gateway settings match the network configuration. Review the controller's I/O connection configuration and requested packet interval (RPI) settings.
Replace faulty Ethernet cables or patch cords. Reconfigure the drive IP address using the HIM or RSLinx if there is an address conflict. Adjust the RPI value in the controller I/O configuration if communication timeouts are occurring due to network latency.
Drive trips on Overcurrent (Fault Code 12) during acceleration
Check the acceleration time parameter and compare it to the load inertia and torque requirements. Measure the output current waveform during acceleration to identify if the trip is instantaneous or develops over time. Inspect the motor and mechanical load for binding or excessive friction.
Increase the acceleration time to reduce the rate of current rise. Verify that the motor nameplate data and control mode parameters are correctly configured. If using vector control, perform an autotune procedure to optimize current regulator gains for the connected motor.
| Condition | Repair, Used, Refurbished, New in box (sealed) |
|---|
Common defects
Common defects on a Allen-Bradley 20G1ALD617AN0NNNNN 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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