1. Введение
This manual provides essential instructions for the safe and effective use of the Keyence FS-V31 Fiber Optic Sensor. The FS-V31 is a digital, single-control fiber optic sensor designed for industrial applications, featuring NPN output and selectable Light-ON/Dark-ON operation. It operates on a 12-24 VDC input and has a low power consumption of 0.71 WATT.
Please read this manual thoroughly before installation, operation, or maintenance to ensure proper functionality and to prevent potential hazards.
2. Информация по технике безопасности
Observe the following safety precautions to prevent injury to personnel and damage to the equipment.
- Электробезопасность: Ensure the power supply is disconnected before wiring or performing any maintenance. Incorrect wiring can lead to electric shock or equipment damage.
- Источник питания: Use only a 12-24 VDC power supply as specified. Exceeding this voltage range can damage the sensor.
- Среда: Do not install the sensor in locations subject to excessive vibration, shock, high temperatures, corrosive gases, or direct sunlight.
- Проводка: Все электромонтажные работы должны выполняться квалифицированным персоналом в соответствии с местными электротехническими нормами.
- Модификации: Do not attempt to disassemble, repair, or modify the sensor. Unauthorized modifications can lead to malfunction and void the warranty.
3. Продукт закончилсяview и компоненты
The Keyence FS-V31 Fiber Optic Sensor consists of the main sensor unit and an integrated cable. Key features include control buttons and indicator lights for easy setup and monitoring.

Рисунок 3.1: Keyence FS-V31 Sensor Unit. This image displays the main sensor body with its integrated cable, clearly showing the product label with model information and serial number.

Рисунок 3.2: Keyence FS-V31 Wiring Details. This image provides a closer view of the sensor's wiring, indicating the color codes for power (BROWN, BLUE) and output (BLACK), along with the CE compliance mark.

Рисунок 3.3: Keyence FS-V31 Control Panel. A detailed view of the sensor's control interface, highlighting the 'SEL' (Select), 'MODE', 'SET', and 'DSC' buttons, which are used for configuration and adjustment.
4. Настройка и установка
4.1 Монтаж
Mount the FS-V31 sensor securely in a location free from excessive vibration and heat. Ensure adequate space for wiring and access to control buttons. Use appropriate mounting hardware (not included) for your specific application.
4.2 Подключение
Refer to Figure 3.2 for wiring color codes. Connect the sensor to a stable 12-24 VDC power supply according to the following:
- BROWN Wire: Connect to +V (Positive DC Power Supply)
- BLUE Wire: Connect to 0V (Negative DC Power Supply / Ground)
- BLACK Wire: NPN Output (Connect to load, then to +V)
Убедитесь, что все соединения надежны и изолированы, чтобы предотвратить короткие замыкания.
5. Операция
5.1 Включение
Once wired correctly, apply 12-24 VDC power. The sensor will power on, and indicator lights will illuminate to show its status.
5.2 Light-ON / Dark-ON Selection
The FS-V31 allows selection between Light-ON and Dark-ON modes. In Light-ON mode, the output activates when light is detected. In Dark-ON mode, the output activates when light is interrupted (darkness is detected).
Refer to Figure 3.3 for control button locations. Use the 'MODE' or 'SEL' button to cycle through operating modes. Consult the sensor's display (if present) or indicator lights to confirm the selected mode.
5.3 Регулировка чувствительности
The 'SET' and 'DSC' buttons (refer to Figure 3.3) are typically used for sensitivity adjustment or teaching functions. Follow these general steps:
- Place the target object in the desired detection position.
- Press and hold the 'SET' button (or follow specific sequence) to initiate teaching.
- Remove the target object (if applicable for 2-point teaching).
- Press the 'SET' button again to complete the teaching process.
The sensor will automatically adjust its threshold for optimal detection based on the taught conditions.
6. Техническое обслуживание
The Keyence FS-V31 is designed for minimal maintenance. However, regular inspection and cleaning can prolong its lifespan and ensure reliable operation.
- Уборка: Periodically clean the sensor's detection surface and housing with a soft, dry cloth. Avoid using abrasive cleaners or solvents.
- Проверка кабеля: Check the integrated cable for any signs of damage, such as cuts, abrasions, or kinks. Replace the sensor if the cable is damaged.
- Монтаж безопасности: Verify that the sensor remains securely mounted and that all connections are tight.
7. Поиск Неисправностей
If the sensor is not operating as expected, refer to the following common issues and solutions:
| Проблема | Возможная причина | Решение |
|---|---|---|
| Sensor does not power on. | Отсутствие питания, неправильная проводка или неисправный блок питания. | Check power connections (BROWN to +V, BLUE to 0V). Verify power supply voltagе (12–24 В постоянного тока). |
| Output does not switch. | Incorrect Light-ON/Dark-ON mode, improper sensitivity adjustment, or target out of range. | Verify selected operating mode. Re-adjust sensitivity using 'SET' button. Ensure target is within detection range. |
| Erratic detection. | Dust/dirt on sensor lens, external light interference, or unstable mounting. | Clean sensor lens. Shield sensor from strong ambient light. Securely mount the sensor. |
8. Технические характеристики
| Параметр | Ценить |
|---|---|
| Модель | FS-V31 |
| Бренд | Кейнс |
| Vol входtage | 12-24 В постоянного тока |
| Потребляемая мощность | 0.71 ВАТТ |
| Тип вывода | NPN |
| Режим работы | Light-ON / Dark-ON Selectable |
| Тип управления | Single Control, Digital |
| Размеры продукта | 5 x 5 x 1 дюйма |
| Вес продукта | 2 фунта |
| Производитель | KEYENCE CORP |
| Дата первой доступности | 1 января 2016 г. |
9. Гарантия и поддержка
Specific warranty terms for the Keyence FS-V31 Fiber Optic Sensor are provided by the manufacturer or authorized seller at the time of purchase. Please retain your proof of purchase for warranty claims.
For technical support, service, or detailed warranty information, please contact Keyence Corporation directly or your local Keyence distributor. You can find more information on their official webсайт: www.keyence.com.





