The **D4CY-R** is a specific model within the **D4CY** series of high-precision limit switches manufactured by **Omron**. These switches are designed for industrial applications requiring high repeatability, water resistance, and compact footprints. --- ### 1. Key Technical Specifications The D4CY-R features a specialized construction designed for harsh environments. Below are its primary technical characteristics: | Parameter | Specification | | :--- | :--- | | **Actuator Type** | Top Plunger (typically) | | **Contact Form** | SPDT (Single Pole Double Throw) | | **Rated Voltage** | 30 VDC | | **Rated Current** | 100 mA (Resistive Load) | | **Degree of Protection** | IP67 (Dust-tight and Water-resistant) | | **Cable Type** | Oil-resistant Vinyl Cabtire Cable | | **Repeatability** | High precision (±0.002 mm to ±0.005 mm depending on setup) | --- ### 2. Internal Electronic Design Unlike standard mechanical limit switches, the D4CY-R is engineered for **low-current signaling** rather than high-power switching. * **Gold-Clad Contacts:** The internal contacts are usually gold-plated to ensure reliable electrical conductivity even at very low voltages and currents (micro-loads). This prevents oxidation which often plagues standard silver contacts. * **Sealing Technology:** The "R" in the series often denotes specific sealing or cable orientations. The internal switch mechanism is encased in a robust housing with an O-ring and a flexible diaphragm to prevent coolant, oil, or water ingress. * **Wiring Configuration:** It typically utilizes a 3-wire or 4-wire configuration: * **Common (COM):** The shared terminal. * **Normally Closed (NC):** Circuit is closed when the plunger is at rest. * **Normally Open (NO):** Circuit closes only when the plunger is depressed. --- ### 3. Applications Because of its extreme precision and resistance to fluids, the D4CY-R is commonly used in: 1. **CNC Machining Centers:** For tool length offsets and position sensing where oil and coolants are present. 2. **Robotic Arms:** For precise end-stop detection. 3. **Semiconductor Equipment:** Where high repeatability is required in a small form factor. --- ### 4. Precautions for Use * **Load Requirements:** Do not exceed the 100mA rating. Connecting this switch to a high-power motor or large relay without a buffer will weld the gold contacts shut. * **Mechanical Over-travel:** Ensure the physical strike distance does not exceed the "Total Travel" limit specified in the datasheet to avoid damaging the internal spring mechanism.