WhatsApp:+86 18150087953 WeChat: +86 18150087953 
Email：
Application Scenarios:In a large municipal water pumping station, a 75 HP raw water pump starts multiple times daily. Direct‑on‑line starting causes severe water hammer, risking pipe damage and joint failure, while high inrush current dims site lighting and trips upstream breakers. The installation of an Allen‑Bradley 150‑A135NBDB transforms this operation: its “Pump Control” profile gradually ramps up voltage, allowing the pump to smoothly accelerate the water column and eliminate destructive pressure surges. Once the motor reaches near‑synchronous speed, the internal bypass contactor engages, bypassing the SCRs to minimize heat generation and energy loss. The controller continuously monitors current imbalance and load, instantly tripping on a jam or underload condition, preventing motor burnout and unplanned downtime.
Parameter:
| Main Parameters | Value/Description |
|---|---|
| Product Model | 150‑A135NBDB (often supplied as 150‑A135NBDB‑A) |
| Manufacturer | Rockwell Automation (Allen‑Bradley) |
| Product Category | Smart Motor Controller / Soft Starter with Bypass |
| Rated Operational Current | 135 A (Continuous, at 40°C) |
| Typical Motor HP Range | Up to 100 HP (at 480V AC) |
| Supply Voltage | 200 – 600 V AC, 3‑Phase, 50/60 Hz |
| Control Voltage | 100 – 240 V AC/DC (Auto‑sensing, for logic & bypass) |
| Start Methods | Voltage Ramp, Current Limit, Full Torque, Dual Ramp |
| Stop Methods | Soft Stop, Pump Stop (anti‑water hammer), Coast |
| Integrated Bypass | Yes (Internal mechanical contactor reduces SCR heating) |
| Communication | Via optional plug‑in modules (EtherNet/IP, DeviceNet, etc.) |
| Protections | Overload, Jam, Phase Loss, Imbalance, Underload, Ground Fault |
| Enclosure | Open Type (IP00), for panel mounting with ventilation |
Technical Principles and Innovative Values:
- Innovation Point 1: Integrated Bypass Contactor for Efficiency: Unlike basic soft starters that run SCRs continuously (causing significant heat and requiring large heatsinks), the 150‑A135NBDB features an integrated electromechanical bypass contactor. After the motor start sequence is complete, the contactor closes to carry the full run current. This reduces voltage drop across the SCRs, lowers operating temperature inside the cabinet, and improves overall energy efficiency during continuous operation.
- Innovation Point 2: Adaptive Motor Thermal Model Protection: The controller replaces traditional bimetal overload relays with a digital thermal model that tracks motor heating in real‑time based on actual current and start frequency. It accounts for cooling time constants and provides more accurate protection against overheating during frequent start‑stop cycles, preventing insulation degradation and extending motor life beyond the capabilities of standard Class 10 or 20 overloads.
- Innovation Point 3: Application‑Specific Control Profiles: The 150‑A135NBDB offers pre‑configured algorithms for different load types. The “Pump Stop” profile, for instance, is specifically engineered to decelerate centrifugal pumps in a manner that prevents water column separation and destructive water hammer. For high‑inertia fans or conveyors, the “Current Limit” start profile prevents excessive inrush without sacrificing breakaway torque.
