Safety use of Photomicro Sensors | OMRON Industrial Automation

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Precautions for Safety Use

Precautions for Correct Use

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General Precautions

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Warning Fig

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To ensure safety, observe the following precautions.

Wiring

Item	Examples
Power Supply	・ DC 3-Wire NPN Output Sensors
Do not apply any voltage exceeding the operating voltage range.Applying any excessive voltage or supplying AC power (100 VAC or higher) to a DC-type sensor may cause the Sensor to explode or burn.
Load Short-circuit	・ DC 3-Wire NPN Output Sensors
Do not short-circuit the load.Doing so may cause the Sensor to explode or burn.
Wiring	・ DC 3-Wire NPN Output Sensors (Example) Wrong polarity
Be sure to wire the Sensor correctly and be careful not to connect the polarities incorrectly, otherwise the Sensor may explode or burn.
	・ DC 3-Wire NPN Output Sensors (Example) Wrong polarity or wrong wiring


Connection with No Load	・ DC 3-Wire NPN Output Sensor
If connected to the power supply without any load, internal elements may explode or burn. Make sure that a proper load is connected to the Sensor.
AND Connections
Do not use AND connections such as in the example shown in the diagram here. Voltage will be applied to the Vcc terminal without the GND terminal of Sensor 2 being securely grounded, and may cause the Sensor to fail.Depending on the model used, inrush current to Sensor 2 when Sensor 1 is turned ON may cause product failure.

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