5 B5WC Built- In Color Sensor User's Manual (E612- E1- 01)
Countermeasures for Switching Power Supplies
Take either of the following countermeasures as required
if connecting a modulated-light sensor to a switching
power supply.
1. Attach a capacitor (e.g., aluminum electrolytic
capacitor) of 10 μF min. as close as possible to the sensor
when wiring.
(Use a capacitor with a dielectric strength that is at least
twice the sensor's power supply voltage. Do not use
tantalum capacitors. A short-circuit may cause the
capacitor to ignite due to the large current flow.)
2. Connect to the 0-V line of the power source or connect
by way of a capacitor (approx. 0.47 μF) at the point
closest to the sensor to reduce the impedance of the
sensor mounting base so that it is difficult for inductive
noise to enter the mounting base.
3. Connect the noise filter terminal (neutral terminal to
ACG) of the switching power supply to the case (FG)
and 0-V terminal of the power supply.
The line connected as mentioned above should be
grounded or connected to the mounting base to ensure
stable operation.
(Recommended by power supply manufacturers.)
Countermeasures to Handle Inductive Noise
Insert a plastic insulator of approximately 10 mm between
the sensor and the mounting base.
Effects of Inductive Noise
When there is inductive noise in the sensor mounting
frame (metal), the output of the sensor may be affected.
In this case, ensure that there is no electrical potential
difference between the sensor 0-V terminal and the
sensor mounting frame (metal).
Or, put a 0.47-μF capacitor between the 0-V terminal and
the frame.
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Other precautions
1. Do not mount the sensor in the following places
because doing so may cause malfunction or failure.
1) Place exposed to a lot of dust or oil mist
2) Place exposed to a lot of corrosive gas
3) Place directly or indirectly exposed to splashes of
water, oil, or chemicals
4) Outdoors or place exposed to intensive light such as
direct sunlight
2. The sensor may be dissolved by exposure to organic
solvents, acid, alkali, aromatic hydrocarbon, and
chlorinated aliphatic hydrocarbon solvents, causing
deterioration in the characteristics.
Do not expose the sensor to such chemicals.
3. An output pulse may occur when the power supply is
turned ON due to the power supply environment and
other influences. Use the sensor in the stable ready-for-
detection state reached in 100 ms after turning on the
power supply.
4. When the number of averaging times is set to a low
value, variations in the RGB output values may increase
due to A/D conversion errors, noise, and other factors.
We recommend checking the RGB output values
multiple times.
5. If the sensor is used outside the power supply voltage
range, set the power to OFF (0 V) once because there is
the possibility of unexpected operation.
6. If foreign matter has adhered to the lens, the output
voltage may vary. When removing foreign matter from
the lens, take care not to touch the lens with a hand, etc.
so as to prevent it from getting scratched or dirty.
7. Use a power supply of max. 15 W for the power supply
connected to this sensor because the internal circuit
does not have a safety device.
8. When disposing of the product, please dispose of it as
industrial waste.
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