Proximity switch and photoelectric sensor wiring diagram, schematic analysis - Database & Sql Blog Articles

Probe domestic switch needle KG-300K needle head diameter is 3.0mm normally open switch needle

Photocoupler

Sensor DC two-wire DC

Sensor DC two-line schematic

1, wiring voltage: 10-30VDC (10-65VDC)
2, normally open contact (NO) or normally closed contact
3, regardless of NPN and PNP
4, with short circuit protection
5, leakage current is less than or equal to 0.5mA
6, the voltage drop is less than 5V
7, two-wire DC sensor can not be connected in series or parallel connection sensor DC three-wire wiring diagram

Sensor DC three-wire schematic

1, wiring voltage: 10-30VDC (10-65VDC)
2, normally open contact (NO) or normally closed contact
3, the voltage drop is less than 1.8V
4, with short circuit protection and polarity protection When the three or four line sensors are connected in series, the voltage drop is added, and the single sensor preparation delay time is added.
Sensor DC four-wire wiring diagram

Sensor DC four-wire schematic

1, wiring voltage: 10-30VDC (10-65VDC)
2, switch between normally open contacts and normally closed contacts
3, with short circuit protection and polarity protection
4, the voltage drop is less than 1.8V
Sensor DC three- or four-wire parallel

Sensor AC two-wire wiring diagram

1, wiring voltage: 20-250VAC
2, normally open contact or normally closed contact
3. Leakage current is less than or equal to 1.3mA
4, the voltage drop is less than 6.5V
Sensor AC two-wire series connection diagram

1, normally open contacts: "and" logic
2, normally closed contacts: "or not" logic
3. When connected in series, the voltage drop across the sensor is added, which subtracts the voltage available on the load and therefore cannot be lower than the minimum operating voltage of the load. Please pay attention to the voltage fluctuations of the grid.
Mechanical switch and AC sensor in series

When the sensor is disconnected from the contact, the supply voltage is disconnected. If the mechanical contact is closed during sensor decay, the sensor may become dysfunctional for a short period of time. The sensor preparation delay time is less than or equal to 80ms, and a fault occurs during this time, or it fails.
Compensation method: a resistor is connected in parallel on the mechanical contact. The resistance in parallel makes the power supply of the sensor not interrupted on the mechanical contact. The mechanical contact will not be out of the rotor delay state even if it is opened and closed. .
For 200VAC, the resistance of the resistor is approximately 82KΩ/1W. The approximate calculation method is 400Ω/V.
Sensor AC two-wire parallel

1. Normally open contact: "AND" logic normally closed contact: "NOR" logic
2. When the sensor normally open contact is closed, another parallel sensor is short-circuited. When the sensor is disconnected, a prepared delay time (≤80ms) is required.
Compensation method: A resistor in series with the contact ensures the minimum operating voltage of the sensor and avoids the preparation time after the contact is disconnected. Resistance calculation method: R=10/IP=I square×R