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TLT2F15 データシート(PDF) 9 Page - Omron Electronics LLC |
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TLT2F15 データシート(HTML) 9 Page - Omron Electronics LLC |
9 / 14 page Proximity Sensors Technical Guide Turning OFF the Power An output pulse may be generated when the power is turned OFF, so design the system so that the load or load line power turns OFF first. Influence of Surrounding Metal The existence of a metal object other than the sensing object near the sensing surface of the Proximity Sensor will affect detection perfor- mance, increase the apparent operating distance, degrade tempera- ture characteristics, and cause reset failures. For details, refer to the influence of surrounding metal table in Safety Precautions for individ- ual Sensors. The values in the table are for the nuts provided with the Sensors. Changing the nut material will change the influence of the surrounding metal. Power Transformers Be sure to use an insulated transformer for a DC power supply. Do not use an auto-transformer (single-coil transformer). Precautions for AC 2-Wire/DC 2-Wire Sensors Surge Protection Although the Proximity Sensor has a surge absorption circuit, if there is a device (motor, welder, etc.) that causes large surges near the Proximity Sensor, insert a surge absorber near the source of the surges. Influence of Leakage Current Even when the Proximity Sensor is OFF, a small amount of current runs through the circuit as leakage current. For this reason, a small current may remain in the load (residual voltage in the load) and cause load reset failures. Verify that this voltage is lower than the load reset voltage (the leakage current is less than the load reset current) before using the Sensor. Using an Electronic Device as the Load for an AC 2-Wire Sensor When using an electronic device, such as a Timer, some types of devices use AC half-wave rectification. When a Proximity Sensor is connected to a device using AC half-wave rectification, only AC half- wave power will be supplied to the Sensor. This will cause the Sensor operation to be unstable. Also, do not use a Proximity Sensor to turn the power supply ON and OFF for electronic devices that use DC half- wave rectification. In such a case, use a relay to turn the power supply ON and OFF, and check the system for operating stability after connecting it. Examples of Timers that Use AC Half-wave Rectification Timers: H3Y, H3YN, H3RN, H3CA-8, RD2P, and H3CR (-A, -A8, -AP, -F, -G) Countermeasures for Leakage Current (Examples) AC 2-Wire Sensors Connect a bleeder resistor to bypass the leakage current flowing in the load so that the current flowing through the load is less than the load reset current. Calculate the bleeder resistance and allowable power using the following equation. P : Watts of bleeder resistance (the actual number of watts used should be several times this number) I : Load current (mA) It is recommend that leeway be included in the actual values used. For 100 VAC, use 10 k Ω or less and 3 W (5 W) or higher, and for 200 VAC, use 20 k Ω or less and 10 W (20 W) or higher. If the effects of heat generation are a problem, use the number of watts in parentheses ( ) or higher. DC 2-Wire Sensors Connect a bleeder resistor to bypass the leakage current flowing in the load, and design the load current so that (leakage current) × (load input impedance) < reset voltage. Calculate the bleeder resistance and allowable power using the following equation. P : Watts of bleeder resistance (the actual number of watts used should be several times this number) iR : Leakage current of Proximity Sensor (mA) iOFF : Load reset current (mA) It is recommend that leeway be included in the actual values used. For 12 VDC, use 15 k Ω or less and 450 mW or higher, and for 24 VDC, use 30 k Ω or less and 0.1 W or higher. R ≤ Vs (k Ω)P > Vs2 (mW) 10 - I R R ≤ Vs (k Ω) P > Vs2 (mW) iR - iOFFR R When using an AC 2-Wire Sensor, connect a bleeder resistor so that the Proximity Sensor current is at least 10 mA, and the residual load voltage when the Proximity Sensor is OFF is less than the load reset voltage. Bleeder resistor R Load AC power supply voltage Vs Vs Bleeder resistor R Load http://www.ia.omron.com/ C-4 (c)Copyright OMRON Corporation 2008 All Rights Reserved. |
同様の部品番号 - TLT2F15 |
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同様の説明 - TLT2F15 |
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