The Allen-Bradley 150-F85NBRD, also cataloged as the 150-F85 Solid-State Soft Starter, operates as a dedicated hardware component for controlled three-phase induction motor acceleration and integrated braking control within industrial power distribution networks. The controller manages continuous operational current up to 85 A across main supply line voltages ranging from 200 to 480 VAC. Microprocessor-driven SCR switching sequences regulate initial inrush current, limiting mechanical stress on motor drive couplings while enabling controlled deceleration via DC injection or Smart Motor Braking algorithms.

Catalog Designation Architecture

• 150-F: Base Bulletin number designating the SMC Flex solid-state soft starter controller series.
• 85: Indicates a nominal operational rating of 85 A for standard inline motor wiring configurations.
• N: Standard open enclosure configuration rated for IP00 panel mounting inside protective cabinets.
• B: Operating main voltage code corresponding to 200...480 VAC, 3-Phase, 50/60 Hz line input.
• R: Control voltage specification for 100...240 VAC (or 24 VAC/DC according to power option variants).
• D: Factory-configured internal option module dedicated to SMB Smart Motor Braking and braking control execution.

Physical and Electrical Specifications

Deterministic Network Bus & Firmware Execution

Integration with Allen-Bradley ControlLogix or CompactLogix platforms is achieved using dedicated Human Interface Modules (HIM) or network adapters via DPI communication slots. The internal architecture utilizes deterministic EtherNet/IP profiles to transmit operational telemetry, such as phase current RMS values and SCR thermal capacity levels. High-speed firmware flash compatibility guarantees synchronized microsecond firing angle controls across all solid-state power poles, preserving network bus stability and preventing transient voltage sags during motor starting cycles.

Shipping Package Content List

• 1 x Allen-Bradley 150-F85NBRD Soft Starter Unit
• 1 x Factory-Integrated Braking Control Option Module
• 1 x Set of Line and Load Terminal Cover Shields
• 1 x Panel Mounting Template and Wiring Guide Sheet

Panel Installation and Wiring Guidelines

• Mounting Requirements
  • Secure the open enclosure unit vertically to an unpainted grounded metal backplate inside an IP54-rated enclosure.
  • Maintain a minimum clearance of 150 mm on both top and bottom sides to allow unhindered vertical convection airflow.
• Conductor and Shielding Rules
  • Separate low-voltage control signal lines from high-voltage 3-phase AC motor power cables by at least 30 cm.
  • Ground the soft starter enclosure frame using a dedicated copper conductor tied directly to the main system earth bus bar.

Technical Questions and Answers

• What primary function does option code D provide in the 150-F85NBRD controller?

  Option code D integrates a internal braking control board enabling Smart Motor Braking and SMB option modes without requiring external mechanical friction brakes.

• Can this soft starter unit be installed outdoors without an external cabinet?

  No, the unit features an Open IP00 enclosure construction and must be mounted inside a protective panel meeting appropriate environmental protection standards.

• How does the unit manage thermal load during continuous running conditions?

  The SMC Flex incorporates internal bypass contactors that engage automatically after full voltage output is achieved, minimizing heat generation across the SCRs.

• What line voltage inputs can be connected to the main terminals?

  The power terminals accept 3-phase AC line voltages from 200 to 480 VAC at supply frequencies of 50 Hz or 60 Hz.

• Does the controller support firmwares updates through network ports?

  Yes, the onboard control logic maintains firmware flash compatibility, allowing field updates via DPI interface tools or EtherNet/IP software tools.

• What happens when an internal SCR over-temperature fault is detected?

  The controller immediately inhibits SCR gate firing pulses, trips the main fault relay output, and locks out restarting until thermal limits normalise.

• Are control supply lines isolated from the power circuit?

  Yes, internal control power supplies feature galvanic isolation between the low-voltage control terminal blocks and the main 3-phase line conductors.

• How are fault reset commands processed by the internal logic?

  Faults can be cleared by applying a signal to the dedicated hardware reset input terminal, cycling control voltage, or transmitting a reset command via fieldbus.