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A liquid level relay is a device used to monitor liquid level and automatically control circuit on/off, commonly applied in automatic water supply or drainage control for water tanks and pools. Its wiring must be determined according to the specific model and function (such as automatic water supply or drainage). Below are general wiring methods and precautions: Liquid，Level Relay，แผนภาพการเดินสายไฟคอนแทคเตอร์ ac，contactor 1p 25a 24vcontactor air conditioner，แผนภาพการเชื่อมต่อคอนแทคเตอร์，คอนแทค for air conditioner，คอนแทคเตอร์ไม่ดึงเข้า，คอนแทคเตอร์บนหน่วย ac，แผนผังการเดินสายคอนแทคเตอร์，คอนแทคเตอร์กระแสตรง，double pole contactor，electric contactor，คอนแทคเตอร์ทำงานอย่างไร，วิธีตรวจสอบคอนแทค，วิธีการต่อสายคอนแทคเตอร์，relay and contactor 15ampl，relay contactor，คอนแทคเตอร์ย้อนกลับ，คอนแทคเตอร์ไฟแบบกลสี่เหลี่ยม d 4 เสา，คอนแทคเตอร์แบบเทเลเมคานิก，surge protector

1. Core Components and Terminal Identifications of Liquid Level Relaysราคา รีเลย์โอเวอร์โหลดความร้อนซีรีย์ Chint NXR
2. Main Componentsราคา เซอร์กิตเบรกเกอร์ CHINT

– Power Terminals: Connected to AC power (เช่น, 220วีและ).

– Liquid Level Detection Terminals: Connected to liquid level detection electrodes (usually divided into three levels: High H, Medium M, Low L).

– Relay Output Terminals: Include Common (คอม), เปิดตามปกติ (เลขที่), and Normally Closed (เอ็นซี) ผู้ติดต่อ, used to control loads such as water pumps.

2. Common Terminal Identifications (Taking a Typical 3-Wire System as an Example)ราคาคอนแทค CHINT

1. Typical Wiring Scenarios and Methods

สถานการณ์ 1: Automatic Water Supply Control (Start the pump when the water level is below the low level, stop when above the high level)

ความต้องการ: Start the water pump when the water level is below the Low (ล) level; stop the pump when the water level reaches the High (ชม) level.

ขั้นตอนการเดินสายไฟ:

1. Power Connection:

– Connect the L and N terminals of the liquid level relay to the 220V AC power supply (L to live wire, N to neutral wire).

2. Liquid Level Detection Electrode Connection:

– High Level H: Connect to the high-level detection electrode in the water tank.

– Medium Level M: Connect to the medium-level detection electrode (ไม่จำเป็น; some models do not require a medium level).

– Low Level L: Connect to the low-level detection electrode in the water tank.

– Common Terminal COM: Connect to the metal shell at the bottom of the water tank (or a separate common electrode).

– หลักการ: When the water level rises, the electrodes conduct through water, and the relay detects the conduction signal.

3. Relay Output Connection (Controlling the water pump contactor):

– Use Normally Open (เลขที่) ผู้ติดต่อ:

– Connect one end of the water pump contactor coil to the live wire, the other end to the relay’s NO terminal, and the relay’s COM terminal to the neutral wire.

– ตรรกะ:

– When the water level is below L, ชม, ม, and L are not conductive, and the relay’s NO contact closes → the pump starts.

– When the water level reaches H, H and COM conduct, and the relay’s NO contact opens → the pump stops.

สถานการณ์ 2: Automatic Drainage Control (Start the pump when the water level is above the high level, stop when below the low level)

ความต้องการ: Start the water pump to drain when the water level is above the High (ชม) level; stop the pump when the water level is below the Low (ล) level.

ขั้นตอนการเดินสายไฟ:

1. Power and Detection Electrode Connection: Same as automatic water supply (ล, N to power, ชม, ม, L to electrodes, COM to common terminal).
2. Relay Output Connection (Controlling the water pump contactor):

– Use Normally Closed (เอ็นซี) ผู้ติดต่อ:

– Connect one end of the water pump contactor coil to the live wire, the other end to the relay’s NC terminal, and the relay’s COM terminal to the neutral wire.

– ตรรกะ:

– When the water level is below L, ชม, ม, and L are not conductive, and the relay’s NC contact remains closed → the pump does not start (normal state).

– When the water level reaches H, H and COM conduct, and the relay’s NC contact opens → the pump starts draining.

– When the water level drops below L, H is disconnected, and the NC contact resets to closed → the pump stops.

III. Key Precautions

1. Electrode Installation Requirements:

– Detection electrodes must be vertically installed on the inner wall of the water tank, with heights corresponding to High, ปานกลาง, and Low levels (ชม > ม > ล).

– Electrode materials must be conductive (เช่น, สแตนเลส) and avoid direct contact with the water tank’s metal shell (unless the shell serves as the common terminal).

2. Contact Capacity Matching:

– Liquid level relay contacts have a low current capacity (usually within 5A). Use a contactor to control high-power water pumps to avoid direct connection to the load.

3. Power and Voltage Matching:

– Confirm the rated voltage of the liquid level relay (เช่น, 220วีหรือ 380V) to prevent damage from incorrect wiring.

4. Insulation and Anti-Interference:

– Use shielded or insulated wires for detection electrode leads, keeping them away from high-power lines to prevent interference and false operations.

5. การทดสอบด้วยตนเอง:

– หลังจากเดินสายไฟ, simulate water levels with the power off (เช่น, short-circuit H and COM with a wire) to observe whether the relay indicator lights and contact actions are normal.

1. ข้อผิดพลาดทั่วไปและการแก้ไขปัญหา

1. Reference Wiring Diagrams

Automatic Water Supply Control (ไม่มีผู้ติดต่อ)

คำอธิบาย: When the water level is below L, NO closes → contactor coil energizes → pump starts; when the water level reaches H, NO opens → pump stops.

Automatic Drainage Control (NC Contacts)

คำอธิบาย: When the water level is above H, NC opens → contactor coil de-energizes → pump starts; when the water level is below L, NC closes → pump stops.

สรุป

For liquid level relay wiring, first clarify the control objective (water supply or drainage), then select corresponding NO/NC contacts, and ensure correct connection of detection electrodes and power supply. Always power off before operation and refer to the product manual to avoid equipment damage or safety hazards due to incorrect wiring.