Please advise possible causes and countermeasures about electrical malfunctions of Photo IC type Photomicrosensors.
ID: FAQE40029E
update:
Answer
The majority of the electrical failures of Photomicrosensors are caused by electrical stresses such as overcurrent and overvoltage.
Explanation
The followings are possible causes of electrical failure of built-in type Photomicrosensors.
- The power supply voltage or current exceeds the specified rating.
- The output transistor is connected without a load.
- Reverse voltage is applied due to wrong wiring during assembly.
- Power line surge.
- There is the induction from high voltage line or power line which are wired parallel to the wiring of the sensor.
- A small inductive load such as a relay is used.
- Destroyed by static electricity during assembly.
Take the following measures for design, assembly and operation.
- Design the circuit so that it does not exceed the specified rating.
- As the internal element may burst or burn out, apply a load when wiring.
- If reverse voltage is applied to Photomicrosensors due to incorrect wiring during assembly, such as a wrong connector type, it may cause a failure even instantaneously. Turn on the power after sufficient confirmation.
- If there is a surge in the power supply line, connect a Zener diode (30 to 35V) or capacitor (0.1 to 1μF) according to the operating environment. Confirm that the surge will go out before operation.
- If the wiring of Photomicrosensors is connected to the same wiring duct for high voltage line and/or power line, the induction may cause failure or malfunction. Use a separate wiring or a single wiring, and confirm that there is no induction.
- The load cannot be a relay.
- Photomicrosensors may be damaged by static electricity during assembly and mounting. Assemble and mount in an environment where static electricity is prevented.
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Product category | Sensors Photomicro Sensors |
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