1. Introduction
This manual provides essential information for the safe and effective use of the KEYENCE LR-W70C Laser Sensor. Please read this manual thoroughly before operating the device and retain it for future reference. The LR-W70C is a small/dual spot type laser sensor designed for precise object detection in industrial applications.
2. Safety Precautions
Failure to follow these safety instructions may result in product damage, personal injury, or property damage.
- This product is intended solely for object detection. Do not use it for human body protection or as a safety device.
- This product is not designed for use in explosion-proof environments. Avoid using it in hazardous or potentially explosive atmospheres.
- The LR-W70C operates on DC power. Applying AC voltage may cause the product to explode or burn.
- Avoid using this product near power lines or high-tension lines, as this may lead to malfunctions or damage due to electrical noise.
- Do not install or operate this product outdoors or in locations where excessive ambient light could directly interfere with the light-receiving element.
3. Product Overview
The KEYENCE LR-W70C is a high-performance laser sensor featuring a small/dual spot type with an M12 connector (4-pin type). It is designed for reliable detection over a range of 30 to 70 mm. Key features include a white LED light source, mutual interference reduction, and various timer functions.
Figure 3.1: KEYENCE LR-W70C Laser Sensor and its instruction manual, shown in protective packaging.
Key Features:
- Model: LR-W70C
- Type: Small/Dual Spot Type M12 connector 4-pin
- Detecting Distance: 30 to 70 mm (1.18" to 2.76")
- Min. Spot Diameter: Approx. 1.6 x 2.9 mm at 50 mm (0.06" × 0.11" at 1.97")
- Light Source: White LED
- Mutual Interference Reduction: Up to 2 units when alternate frequencies are set.
- Timer Functions: OFF/ON delay, OFF delay, One-shot.
- Response Time: Selectable from 200 µs to 999 ms depending on mode (1-Spot, 2-Spot, Difference Monitoring, 2-Point Matching).
- I/O: NPN/PNP open collector control output, external input for tuning/transmission OFF.
- Protection Circuit: Against reverse power connection, power supply surge, output overcurrent, output surge, and reverse output connection.
- Power Supply: 10 to 30 VDC.
- Enclosure Rating: IP65/IP67 (IEC60529).
- Material: Zinc die cast case, PPSU indicator cover, PES buttons, PMMA lens cover/display (scratch-resistant coating), PMP connector ring, PEI connector socket.
- Weight: Approx. 75 g.
Figure 3.2: Detailed view of the KEYENCE LR-W70C Laser Sensor, highlighting its compact design and M12 connector.
4. Setup and Installation
4.1 Unpacking
Carefully remove the sensor and any accessories from the packaging. Inspect for any visible damage. Retain packaging for future transport or storage.
Figure 4.1: The product box for the KEYENCE LR-W70C Laser Sensor, showing model identification.
4.2 Mounting
Mount the sensor securely in the desired detection position. Ensure the detection surface is clear of obstructions and within the specified detecting distance of 30 to 70 mm. Consider the minimum spot diameter for precise object detection.
4.3 Wiring
Connect the sensor using an M12 connector (4-pin type). Refer to the detailed wiring diagrams provided in the complete instruction manual for correct connections. Ensure the power supply is within the specified range of 10 to 30 VDC. The control output can be NPN or PNP open collector, selectable as N.O./N.C. The external input can be configured for tuning or transmission OFF.
Warning: Ensure the power supply is DC. Applying AC voltage will damage the unit.
5. Operating Instructions
5.1 Power On
After completing all wiring, apply power (10 to 30 VDC) to the sensor. The sensor will initiate its power-on sequence.
5.2 Mode Selection and Tuning
The LR-W70C supports various operating modes and timer functions. These can typically be configured via buttons on the unit or through external input. Refer to the full instruction manual for detailed procedures on:
- Selecting 1-Spot Mode, 2-Spot Mode, Difference Monitoring, or 2-Point Matching.
- Adjusting response time settings (200 µs to 999 ms).
- Configuring timer functions (OFF/ON delay, OFF delay, One-shot).
- Using the external input for tuning or to turn off transmission.
For advanced settings and detailed parameter adjustments, consult the comprehensive instruction manual or the KEYENCE website for software and setup files (e.g., I/O-Link V1.1/COM2 (38.4 kbps) is supported).
6. Maintenance
6.1 Cleaning
Regularly clean the sensor's lens cover and housing with a soft, dry cloth. For stubborn dirt, a slightly damp cloth with mild detergent may be used, ensuring no liquid enters the sensor. Avoid abrasive cleaners or solvents.
6.2 Inspection
Periodically inspect the sensor and its wiring for any signs of damage, wear, or loose connections. Ensure the mounting remains secure. Check the operating environment to confirm it stays within specified ambient light and temperature limits.
7. Troubleshooting
This section provides solutions to common issues. For more complex problems, refer to the full instruction manual or contact technical support.
- Sensor not powering on: Check power supply voltage (10-30 VDC) and wiring connections. Ensure reverse power connection protection has not been triggered.
- Inconsistent detection: Verify the detecting distance (30-70 mm) and ensure the target is within the minimum spot diameter. Clean the lens cover. Check for excessive ambient light interference.
- Output not switching: Confirm I/O settings (NPN/PNP, N.O./N.C.) are correct. Check for output overcurrent or surge protection activation.
- Mutual interference: If using multiple units, ensure alternate frequencies are set to reduce interference.
8. Specifications
Detailed technical specifications for the KEYENCE LR-W70C Laser Sensor are provided below.
Figure 8.1: A comprehensive table outlining the technical specifications of the LR-W70C sensor.
| Parameter | Specification |
|---|---|
| Model | LR-W70C |
| Type | Small/Dual Spot Type M12 connector 4-pin type |
| Detecting Distance | 30 to 70 mm (1.18" to 2.76") |
| Min. Spot Diameter | Approx. 1.6 x 2.9 mm at 50 mm (0.06" × 0.11" at 1.97") |
| Light Source | White LED |
| Mutual Interference Reduction | Up to 2 units when alternate frequencies set |
| Timer | OFF/ON delay/OFF delay/One-shot |
| Response Time (1-Spot Mode) | 200 µs, 1 ms, 10 ms, 100 ms, 500 ms selectable |
| Response Time (2-Spot Mode, Difference Monitoring) | 500 µs, 2.5 ms, 20 ms, 200 ms, 999 ms selectable |
| Response Time (2-Spot Mode, 2-Point Matching) | 400 µs, 2 ms, 20 ms, 200 ms, 999 ms selectable |
| Control Output | NPN open collector/PNP open collector selectable, 30 VDC or less, 50 mA or less, remaining voltage: 2 V or less, N.O./N.C. selectable |
| External Input | Tuning /Transmission OFF selectable, Short circuit current: 1 mA or less (NPN)/2 mA or less (PNP) |
| Protection Circuit | Against reverse power connection, power supply surge, output overcurrent, output surge, and reverse output connection |
| Power Voltage | 10 to 30 VDC, including 10% ripple (P-P), Class 2 or LPS |
| Current Consumption | 60 mA or less (without load) at 24 VDC; 110 mA or less (without load) at 12 VDC |
| Enclosure Rating | IP65/IP67 (IEC60529) |
| Ambient Light | Incandescent lamp: 10,000 lux or less, Sunlight: 20,000 lux or less |
| Ambient Temperature | -20 to +50 °C (-4 to 122 °F) (No freezing) |
| Relative Humidity | 35 to 85 % RH (No condensation) |
| Vibration Resistance | 10 to 55 Hz, Double amplitude 1.5 mm, 2 hours in each of the X, Y, and Z directions |
| Shock Resistance | 1,000 m/s², 6 times in each of the X, Y, and Z directions |
| Material (Case) | Zinc die cast (Nickel chrome plating) |
| Material (Indicator Cover) | PPSU |
| Material (Buttons) | PES |
| Material (Lens Cover and Display) | PMMA (scratch-resistant coating) |
| Material (Connector Ring) | PMP |
| Material (Connector Socket) | PEI |
| Weight | Approx. 75 g |
9. Warranty and Support
For warranty information, technical support, or service inquiries regarding your KEYENCE LR-W70C Laser Sensor, please contact the original point of purchase or the manufacturer, Vanky Industry. It is recommended to register your product if applicable to ensure access to full support services.
Additional resources, including detailed instruction manuals and software downloads, may be available on the official KEYENCE website or through authorized distributors.
