Configured for reduced voltage motor starting in AC drive systems, the Allen-Bradley 150-F625NBAB, also cataloged as the 150-F SMART MOTOR CONTROLLER, provides direct phase control for three-phase induction motors up to 355 kW at 400 V.

Catalog Number Breakdown

• 150-: SMC™ Solid-State Reduced Voltage Starter series
• F: Standard open-type construction
• 625: 625 A rated operational current at 40 deg C
• N: 230/240 VAC control voltage rating
• B: Standard pump control configuration
• A: No internal bypass contactor
• B: Standard firmware revision

Electrical & Mechanical Data

EtherNet/IP Backplane Integration & I/O Scaling

The unit interfaces with Allen-Bradley ControlLogix and CompactLogix platforms via compatible communication adapters, utilizing producer/consumer messaging for deterministic start/stop commands. Firmware flash compatibility aligns with SMC™ Flex firmware revisions to ensure consistent ramp profiling. I/O density scaling allows integration of pump control logic without additional analog input modules, reducing backplane bus latency during torque ramp transitions.

Ordering Information

• 1 x 150-F625NBAB SMART MOTOR CONTROLLER, open type
• 1 x Installation and wiring technical data sheet (digital format)

Mounting & Wiring Guidelines

• Mount vertically on a flat, rigid surface with minimum 50 mm clearance above and below for convection cooling.
• Torque power terminals to 45 N·m using Class A copper conductors rated for 75 deg C minimum.
• Route control wiring separately from power conductors; maintain 200 mm separation or use grounded metallic conduit.
• Bond PE terminal to system ground bus with conductor sized per NEC Table 250.122 for 625 A service.

Technical FAQ

Q: Does the 150-F625NBAB support hot-swap replacement on an energized backplane?

A: No. The controller must be de-energized prior to removal or installation. The solid-state thyristor assembly lacks isolated power insertion sequencing and will fault if subjected to live bus connection.

Q: What is the minimum conductor size required for the 625 A power terminals?

A: Use 300 kcmil copper conductors with 75 deg C insulation rating. Two parallel conductors per phase are permissible if sized per NEC ampacity derating tables and installed with individual overcurrent protection.

Q: Can the pump control logic be disabled via firmware configuration?

A: Yes. Pump control functionality is configurable through the SMC™ parameter set. Disabling it reverts ramp profiles to standard soft-start/soft-stop curves without affecting thyristor firing angles.

Q: What is the expected voltage drop across the SCRs during full conduction?

A: Typical forward voltage drop is 1.2–1.7 V per phase at rated current. This must be factored into system efficiency calculations and thermal dissipation planning for enclosure ventilation.

Q: Is external bypass contactor control available on this model?

A: No. The suffix "A" indicates no internal bypass. External bypass must be field-wired and sequenced via auxiliary contacts to prevent SCR overheating during continuous run mode.

Q: What control voltage tolerance is permitted on the 230/240 VAC supply?

A: Us tolerance is +10% / -15% (195–264 VAC). Operation outside this range may cause control board reset or incorrect zero-cross detection, leading to phase imbalance during ramp-up.

Q: Does the unit provide phase loss or phase reversal protection?

A: Yes. The controller continuously monitors line voltage for phase loss, phase reversal, and undervoltage conditions, initiating a controlled shutdown if asymmetrical conditions exceed 15% deviation.

Q: What is the required clearance for heat sink ventilation?

A: Maintain minimum 100 mm of unobstructed airflow path behind and above the unit. Ambient temperature must not exceed 40 deg C at the heat sink surface to maintain 625 A rating.