Allen-Bradley 25B-V4P8N104

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SKU: 25B-V4P8N104 Category: Drive Brand: Allen-Bradley

The Allen-Bradley 25B-V4P8N104 is a PowerFlex 525 AC variable frequency drive manufactured by Allen-Bradley, a brand of Rockwell Automation. It belongs to the PowerFlex 520 series, which is designed for standalone machine-level motor control applications. This specific SKU is rated for 240V AC single-phase input with a continuous output current of 4.8A, corresponding to a 1.5 kW (2 HP) power rating.

The PowerFlex 525 features an embedded EtherNet/IP communication port as standard, enabling direct integration into Logix-based control architectures without the need for an additional communication module. The drive supports a dual-port USB interface for parameter configuration and firmware updates, and includes an optional cassette slot for expanded I/O or additional communication adapters. Safety functionality includes a hardwired Safe Torque Off (STO) input rated to SIL 2 / PLd, and the drive supports multiple control modes including V/Hz, sensorless vector, and closed-loop vector with encoder feedback via an optional cassette. The unit operates from a 200–240V AC single-phase supply and incorporates an internal EMC filter and a built-in brake transistor.

The PowerFlex 525 is widely deployed in packaging machinery, conveyor systems, material handling equipment, and pump and fan applications across food and beverage, automotive, and general manufacturing industries. Its compact form factor and integrated EtherNet/IP connectivity make it well suited for distributed machine architectures where drives are mounted close to the motor. The STO safety function allows integration into safety-rated machine stop circuits without the need for external contactors, reducing panel space and component count.

Technical Specifications

Series / Product Family	PowerFlex 525 (PowerFlex 520 Series)
Input Voltage	200–240V AC, Single-Phase
Input Frequency	47–63 Hz
Output Current (Continuous)	4.8 A
Power Rating	1.5 kW (2 HP)
Output Voltage	0–240V AC, 3-Phase
Output Frequency Range	0–500 Hz
Control Type	V/Hz, Sensorless Vector, Closed-Loop Vector (with encoder cassette)
Communication Interface	EtherNet/IP (embedded, dual-port), USB (Type B)
Safety Features	Safe Torque Off (STO), SIL 2 / PLd (EN ISO 13849-1)
Feedback Interface	Encoder input via optional cassette
Operating Temperature	0–50 °C (up to 40 °C without derating)
Storage Temperature	-40–85 °C
Relative Humidity	5–95% non-condensing
IP / Protection Rating	IP20 / NEMA Type 1 (with optional conduit box)
Mounting	DIN rail or panel mount
Certifications	UL, CE, RCM, RoHS
Brake Transistor	Built-in

Common Fault Codes

Fault Code F005: Overvoltage: DC bus voltage has exceeded the overvoltage trip threshold, typically caused by regenerative energy during deceleration or high input line voltage.
Check input line voltage for overvoltage conditions. Increase deceleration time or install a dynamic braking resistor to absorb regenerative energy. Verify DC bus voltage is within specification.
Fault Code F006: Undervoltage: DC bus voltage has dropped below the undervoltage trip threshold, indicating a loss or sag of input supply voltage.
Check input supply voltage and connections. Verify that the supply voltage is within the rated 200–240V AC range. Check for loose wiring or failing input contactors.
Fault Code F012: Overcurrent: Output current has exceeded the drive's overcurrent trip level, which may indicate a motor overload, short circuit, or excessive load.
Check motor and output wiring for short circuits or ground faults. Verify motor load is within rated capacity. Increase acceleration time to reduce inrush current.
Fault Code F013: Ground Fault: A ground fault has been detected on the output side of the drive, indicating current leakage to earth from the motor or output wiring.
Inspect motor wiring and motor windings for insulation breakdown. Disconnect the motor and test insulation resistance. Replace damaged cables or motor if insulation failure is confirmed.
Fault Code F033: Auto-Tune Fault: The auto-tune procedure failed to complete successfully, which may be due to incorrect motor nameplate data entry or motor not connected.
Verify that motor nameplate data (voltage, current, frequency, speed, power) has been entered correctly into the drive parameters. Ensure the motor is connected and free to rotate if dynamic auto-tune is selected.
Fault Code F081: Communication Loss: The drive has lost communication with the EtherNet/IP network or the controlling PLC/scanner within the configured timeout period.
Check EtherNet/IP cable connections and network switch status. Verify IP address configuration and that the controller is actively scanning the drive. Review the Communication Loss Action parameter to set appropriate drive response.
Fault Code F122: Safe Torque Off (STO) Fault: The STO input circuit has detected an unexpected state or the STO function has been activated while the drive was running.
Check the STO wiring at terminals and verify that the 24V DC STO signal is present and stable. Inspect safety relay or safety controller outputs feeding the STO input. Clear the fault and re-enable the STO circuit before restarting.
Fault Code F003: Power Loss: Input power was lost momentarily during drive operation, triggering a power loss fault based on the configured power loss response parameters.
Check input supply for intermittent voltage drops or phase loss. Inspect input fuses, circuit breakers, and wiring connections. Configure the Power Loss Action parameter to ride through brief interruptions if appropriate.

Frequently Asked Questions

What is the input voltage and phase requirement for the 25B-V4P8N104?

The 25B-V4P8N104 requires a single-phase 200–240V AC input supply at 47–63 Hz. It is not suitable for three-phase input at this SKU designation.

Does the PowerFlex 525 have EtherNet/IP communication built in?

Yes, the PowerFlex 525 includes a dual-port embedded EtherNet/IP adapter as standard, allowing daisy-chain network topologies without an external switch. No additional communication module is required for EtherNet/IP connectivity.

Is Safe Torque Off (STO) included on this drive?

Yes, the PowerFlex 525 includes a hardwired Safe Torque Off input rated to SIL 2 and PLd per EN ISO 13849-1. This allows the drive to be integrated into safety-rated stop circuits without an external safety contactor.

Can the 25B-V4P8N104 be used with a three-phase motor?

Yes, despite accepting single-phase input, the PowerFlex 525 produces a three-phase PWM output suitable for standard three-phase AC induction motors. The output current rating of 4.8A must not be exceeded.

What optional cassettes are available for the PowerFlex 525?

Optional cassettes include encoder feedback modules for closed-loop vector control, additional I/O expansion modules, and alternative communication adapters such as DeviceNet, PROFIBUS DP, and CANopen. Cassettes are installed in the dedicated slot on the drive.

Troubleshooting

Drive displays a fault code immediately upon power-up and will not run

Read the active fault code from the drive keypad or via connected software such as Connected Components Workbench. Check fault history parameters to identify if the fault is persistent or intermittent.

Address the root cause indicated by the specific fault code. Clear the fault using the Stop/Reset button or via a digital input configured as a fault reset. If the fault recurs immediately, inspect wiring, motor, and input supply before attempting further resets.

Motor runs but speed does not respond to the reference signal

Verify the speed reference source parameter is configured correctly (e.g., analog input, EtherNet/IP, keypad). Measure the analog input signal voltage at the drive terminals if an analog reference is used.

Correct the speed reference source parameter to match the intended control method. If using an analog input, verify the signal wiring and scaling parameters. If using EtherNet/IP, confirm the controller is writing the correct reference value to the drive.

Drive trips on Overcurrent (F012) during acceleration

Monitor output current during acceleration using the drive's real-time monitoring parameters or an external clamp meter. Determine whether the trip occurs at a consistent speed or load point.

Increase the acceleration time parameter to reduce the rate of current rise. Check that the motor is not mechanically overloaded or stalled. Verify that motor nameplate data is correctly entered and that auto-tune has been performed.

EtherNet/IP communication fault (F081) occurs intermittently

Check the EtherNet/IP connection status LEDs on the drive. Use the network diagnostic parameters to review packet error counts. Inspect cable connections at the drive and network switch.

Replace suspect Ethernet cables and ensure connectors are fully seated. Verify the drive IP address does not conflict with other devices. Adjust the Communication Loss Timeout parameter if brief network interruptions are causing nuisance faults.

Drive powers up but keypad display is blank or unresponsive

Check that the input supply voltage is within the 200–240V AC range by measuring at the drive input terminals. Inspect the control board ribbon cable connection between the keypad and the main drive board.

If input voltage is correct and the drive does not respond, reseat the keypad connector. If the display remains blank, the internal power supply or control board may be faulty and the drive should be sent for repair or replacement.

Condition	Repair, Used, Refurbished, New in box (sealed)

Common defects

Common defects on a Allen-Bradley 25B-V4P8N104 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