Allen-Bradley 150-F85NBDB SMC Flex Soft Starter – 85A, 460V AC

Product Introduction

When a centrifugal pump application demands smooth, controlled starting and stopping to prevent water hammer and mechanical stress, the Allen-Bradley 150-F85NBDB SMC Flex soft starter delivers a reliable solution. This solid-state, low-voltage controller from the SMC-Flex series is designed for three-phase induction motors, offering 85 Amps of current and 60 Horsepower at 460 Volts AC. Its open design includes a 5-button front-panel keypad and a built-in 3-line by 16-character LCD display for easy programming and diagnostics.

Technical Specifications Breakdown

The 150-F85NBDB operates with a line input voltage of 460 Volt AC (3-phase) and a control voltage of 200 to 230 Volts AC. It provides 4 fully programmable auxiliary contacts (N.O., N.C.) for flexible integration. The controller supports trip classes 10, 15, 20, and 30, with a trip current rating of 117% of motor FLC. For power circuit protection, it includes metal oxide varistors (220 J, optional) and an RC snubber network for DV/DT protection. The control circuit features an input OFF-state current of less than 10 mA AC and less than 3 mA DC, and an input ON-state current of 20 mA at 120V AC or 40 mA at 240V AC. The auxiliary contacts are rated AC/DC: 5 A conventional thermal current (Ith) and 3A at 120V AC, 1.5A at 240V AC. The controller also includes a tachometer input of 0...5V DC, with 4.5V DC representing 100% speed.

Industry Applications

The 150-F85NBDB is ideal for pump control, particularly in centrifugal pump systems where the optional pump control mode reduces pressure surges. It also suits conveyor systems, fans, and compressors requiring soft start and soft stop. In a typical water treatment facility, this controller can manage a 60 HP pump motor, using dual ramp start to accommodate varying load conditions. The built-in DPI communication capability allows connection to Allen-Bradley Bulletin 20 HMI modules, enabling remote monitoring and control.

Installation & Setup Guidance

For installation, use the specified cable sizes: lower line and load side terminals accept 0.8...2.5 mm² (18...14 AWG), while upper line side terminals accept 2.5...95 mm² (14...3 AWG) and upper load side terminals accept 2.5...50 mm² (14...1 AWG). The control circuit requires a transformer control module rated at 75VA at 100...240V AC. Ensure the heatsink fan is supplied with 20VA at 110/120V AC or 220/240V AC. The controller supports a maximum short-circuit rating of 10 Kilo-Amps and a high capacity available fault current of 70kA at 600V with appropriate fuses. Always follow the manufacturer's guidelines for wiring and grounding.

Maintenance & Reliability

Routine inspection of the heatsink fan and air vents is recommended to prevent overheating. The controller includes built-in overload, underload, stall, and jam protection, reducing the need for external devices. The LCD display provides status indication: stopped, starting, stopping, at speed, alarm, and fault, simplifying troubleshooting. For long-term reliability, verify that the control voltage remains within the specified 200 to 230 Volts AC range and that the operating environment is clean and dry.

Compatibility & Integration

The 150-F85NBDB integrates seamlessly with Allen-Bradley control systems via its built-in DPI communication port. It supports connection to Bulletin 20 HMI modules and communication modules. The controller also accepts PTC thermistor inputs for motor thermal protection, with a maximum cold resistance of 1500 Ω and a response time of 800 ms. For auxiliary contacts, the controller provides four programmable contacts (19/20, 29/30, 31/32, 33/34) that can be configured for normal, up-to-speed, fault, alarm, or network operation.

Selection Guide & Purchasing Advice

Before purchasing the 150-F85NBDB, verify that your motor's full-load current does not exceed 85 Amps and that the line voltage matches 460 Volt AC (3-phase). For delta-connected motors, the controller supports up to 147 Amps. Consider adding the optional SMB smart motor braking control for applications requiring rapid stopping. For complete technical specifications and current availability, contact BluePLC Industrial. Our team can help confirm lifecycle status and recommend compatible accessories.