The **CVR1-DC-R/CE** is a high-performance **Voltage Monitoring Relay** (often referred to as a Control Voltage Relay) manufactured by **Connectwell**. This device is specifically designed to monitor DC supply voltages and protect electrical systems from voltage fluctuations. --- ### ## Technical Specifications Below are the primary electronic and operational characteristics of the CVR1-DC-R/CE: | Parameter | Specification | | :--- | :--- | | **Product Type** | DC Voltage Monitoring Relay | | **Supply Voltage (Un)** | 24V DC to 240V DC (Wide Range) | | **Monitoring Range** | 70% to 130% of $U_n$ | | **Output Contacts** | 1 C/O (SPDT - Single Pole Double Throw) | | **Contact Rating** | 5A @ 250V AC / 30V DC (Resistive) | | **Trip Settings** | Under-voltage and Over-voltage thresholds | | **Time Delay** | Adjustable Trip Delay (0.1s to 10s) | | **Mounting** | DIN Rail Mounting (35mm) | | **Certifications** | CE Marked, RoHS Compliant | --- ### ## Core Electronic Functions The internal circuitry of the relay performs four critical electronic functions to ensure system stability: 1. **Voltage Sensing:** It continuously samples the DC input voltage. Using a precision comparator circuit, it matches the live voltage against the user-defined Under-Voltage (UV) and Over-Voltage (OV) setpoints. 2. **Adjustable Thresholds:** The device features rotary potentiometers on the front face, allowing manual adjustment of trip levels. This is essential for protecting sensitive electronic components that have narrow operating tolerances. 3. **Hysteresis (Differential):** To prevent "chattering" (rapid switching) of the relay when the voltage fluctuates right at the threshold, the device includes a built-in hysteresis. This ensures the relay only resets once the voltage returns to a safe, stable level. 4. **LED Diagnostics:** It typically features LED indicators to provide visual status: * **Green LED:** Power ON/Healthy. * **Red LED:** Fault condition (UV/OV). --- ### ## Connection Diagram (Conceptual) The wiring typically involves the supply/sensing terminals and the output relay terminals: ```text Terminals: A1 (+) & A2 (-): DC Supply Input / Monitoring Input 15: Common Contact 16: Normally Closed (NC) 18: Normally Open (NO) ``` --- ### ## Common Applications * **Battery Banks:** Monitoring the discharge state of industrial batteries. * **Solar Power Systems:** Protecting inverters from DC over-voltage. * **Control Panels:** Ensuring PLCs and sensors receive stable DC power. * **Telecommunications:** Guarding rectifiers and DC distribution units.