Application Scenarios
Imagine a water treatment facility where large centrifugal pumps start multiple times per hour. Each full‑voltage start sends a massive current spike through the system, stressing the motor windings, causing pressure surges that hammer the pipes, and occasionally tripping the main breaker. The plant engineer replaces the old across‑the‑line starter with the Allen‑Bradley 150‑A135NBD. Now, the pump ramps up smoothly over a selectable 2‑to‑30‑second soft‑start period, cutting inrush current by up to 70%. The pressure transients disappear, the breaker stays closed, and the motor runs cooler—extending its insulation life by years .
In a material handling application, a conveyor line carries heavy aggregates. The 150‑A135NBD is programmed for current‑limit start, capping the motor current at a preset level to avoid overloading the upstream transformer while still providing enough torque to break the load free. The built‑in energy‑saver mode reduces the motor voltage during light‑load periods, cutting power consumption and lowering the facility’s electricity bill .
For a maintenance team managing a legacy Rockwell Automation system, the 150‑A135NBD offers a drop‑in replacement for older SMC controllers, preserving the existing control panel layout and wiring while adding modern diagnostic and metering capabilities via the front‑panel keypad and LCD display .
Parameters
| Main Parameters | Value / Description |
|---|---|
| Product Model | 150‑A135NBD |
| Manufacturer | Allen‑Bradley (Rockwell Automation) |
| Product Category | Smart Motor Controller / Solid‑State Soft Starter |
| Continuous Current | 135 A |
| Line Voltage | 208 – 480 V AC, 3‑phase, 47 – 63 Hz |
| Control Voltage | 100 – 240 V AC, 1‑phase |
| Max. HP Rating | 100 HP @ 460 V AC; 50 HP @ 230 V AC |
| Max. kW Rating | 55 kW @ 400 V AC; 90 kW @ 500 V AC |
| Enclosure Type | Open (panel mount) |
| Auxiliary Contacts | 1 N.O. + 1 N.C. (SPDT) |
| Starting Modes | Soft Start (with Kick‑Start), Current Limit, Full Voltage, Dual Ramp, Energy Saver |
| Protection | Integrated motor overload, SCR short‑circuit, phase loss, thermal protection |
| User Interface | Keypad programming interface with LCD display |
| Weight | Approx. 11.34 kg (25.0 lbs) |
| Power Consumption | 30 VA (control module) |
Technical Principles and Innovative Values
Innovation Point 1: Microprocessor‑Controlled Starting Profiles.
The 150‑A135NBD uses a microprocessor to precisely control the firing angle of six back‑to‑back SCRs (silicon‑controlled rectifiers) in the power circuit. By gradually increasing the voltage applied to the motor during startup, the controller delivers a smooth, stepless acceleration curve . The module supports multiple selectable start profiles: Soft Start with an optional Kick‑Start pulse to break away stuck loads, Current Limit Start that caps the inrush at a user‑set multiple of full‑load current, and Full Voltage Start for applications requiring immediate torque .
Innovation Point 2: Built‑In Energy Saver and Metering.
Unlike simple starters, the 150‑A135NBD includes an Energy Saver function that continuously monitors the motor’s power factor and reduces the voltage when the motor is lightly loaded, optimizing efficiency . The integrated metering function provides real‑time readings of current, voltage, and power directly on the front‑panel LCD, eliminating the need for separate instrumentation in many applications .
Innovation Point 3: Comprehensive Built‑In Protection.
The integrates electronic motor overload protection with selectable trip classes (10, 15, 20), protecting against prolonged overcurrent conditions . Additionally, the controller performs pre‑start self‑checks for SCR shorts, phase loss, and open motor connections, aborting the start and displaying a fault code to prevent damage from wiring errors or component failures .
