The model codes **DDB-SJS-R** and **DDB-UJS-RS1-1** typically refer to specific configurations of **Multi-Point Lubrication Pumps** or **Grease Pumps**, often used in heavy machinery and industrial automation. Below is a breakdown of the electronic and electromechanical components found in these units. --- ## 1. Core Component Breakdown | Component | Description | Function | | :--- | :--- | :--- | | **AC/DC Drive Motor** | Typically a high-torque synchronous or induction motor. | Drives the internal eccentric shaft to push the plungers. | | **Plunger Elements** | The mechanical-electronic interface. | Converts rotational energy into reciprocating motion to discharge lubricant. | | **Control PCB** | Integrated circuit board (found in "UJS" models). | Manages timing, cycle intervals, and error reporting. | | **Pressure Switch** | Electromechanical sensor. | Monitors system pressure; sends a signal if a blockage occurs. | | **Level Sensor** | Capacitive or Float switch. | Detects low lubricant levels to prevent the pump from running dry. | --- ## 2. Technical Specifications & Wiring These units are designed for harsh environments and usually feature the following electrical characteristics: ### A. Power Requirements * **Voltage Options:** Frequently available in **24V DC**, **110V AC**, or **220V/380V AC**. * **Insulation Class:** Usually Class F, protecting the electronics from heat buildup. ### B. Electronic Protection (IP Rating) * **Rating:** Most units are **IP54 or IP65** rated. * **Significance:** This ensures the internal wiring and motor are protected against dust and water splashes common in industrial settings. ### C. Signal Logic * **Normally Open (NO) / Normally Closed (NC):** The level and pressure sensors provide dry contact signals to a PLC (Programmable Logic Controller). * **Cycle Monitor:** The electronics can be programmed to run for a set time (e.g., 2 minutes) and rest for a set time (e.g., 30 minutes). --- ## 3. Difference Between SJS and UJS Models While the base pump design is similar, the suffix denotes electronic complexity: 1. **DDB-SJS-R:** * Usually a "Standard" version. * Relies on an external control system (like a machine's main PLC) to start/stop the motor. * Contains basic sensors (Level/Pressure) but limited internal logic. 2. **DDB-UJS-RS1-1:** * An "Integrated" or "Advanced" version. * **RS1-1** often indicates a specific wiring configuration or a built-in timer module. * Allows for local adjustment of lubrication frequency without modifying the main machine software. --- ## 4. Maintenance & Safety Electronics * **Overload Protection:** The motor circuitry usually includes a thermal cutout to prevent burnout if the grease is too viscous or the ambient temperature is too high. * **LED Indicators:** Many modern iterations include a green "Run" LED and a red "Fault" LED on the junction box for immediate diagnostics. ---