Wiring of the Automatic Water Supply Device with a Liquid Level Relay

The wiring of the automatic water supply device with a liquid level relay should be carried out according to the specific model and circuit design. The following are the general wiring methods and precautions for reference: Schneider Circuit Breakers Price

 I. Basic Wiring Principlelatest price list of CHNT circuit breakers for May 2025

The liquid level relay controls the start and stop of the water pump by detecting the liquid level (high/middle/low). The core wiring includes:

1. **Power Input** (connect to the utility power or the power of the control circuit)

2. **Liquid Level Sensor Input** (high, middle, and low liquid level contacts)

3. **Water Pump Control Output** (control the start and stop of the water pump)

 II. General Wiring Steps (Taking a Single-phase Water Pump as an Example)

 1. Terminal Identification InstructionsChint's NB1-63DC series DC circuit breakers Price

 2. Wiring Schematic Diagram

```Chint NXR series thermal overload relays price

Power Supply (220V) → Liquid Level Relay (L/N)

Liquid Level Sensor (Float Ball/Electrode) → Relay (H/M/L)

Relay Output (COM+NO) → Water Pump Power Supply → Water Pump

```

3. Specific Connections

- **Power Connection**: Connect the 220V live wire (L) and the neutral wire (N) to the power terminals of the relay.

- **Liquid Level Sensor Connection*CHINT contactor price*:

  - Float Ball Sensor: Connect the high liquid level (H) and low liquid level (L) contacts to the corresponding terminals of the relay respectively (the middle liquid level M can be optionally connected for buffer control).

  - Electrode Sensor: Connect the three electrodes (high/middle/low) to the H/M/L terminals correspondingly.

- **Water Pump Control Output*CHINT surge protector price*:

  - When the water level is lower than the low liquid level (L), the relay starts the water pump: Connect the common terminal (COM) and the normally open contact (NO) of the relay to the power circuit of the water pump.

  - When the water level reaches the high liquid level (H), the relay stops the water pump: NO is disconnected, and the water pump is powered off.

III. Wiring of a Three-phase Water Pump (Requires a Contactor)

1. **Relay Output Controls the Contactor Coil* Schneider LRD Thermal Relay Price*:

   - Relay COM+NO → Contactor coil (for example, connect a 220V coil to AC220V, and a 380V coil to AC380V).

2. **Main Contacts of the Contactor are Connected to the Three-phase Water Pump**:

   - Connect the three-phase input terminals of the contactor to the power supply, and the output terminals to the motor of the water pump.

 IV. Function Logic Instructions

- **Starting Condition**: When the water level is lower than the low liquid level (L), the relay closes, and the water pump starts.

- **Stopping Condition**: When the water level reaches the high liquid level (H), the relay opens, and the water pump stops.

- **Function of the Middle Liquid Level (M)** (Optional): To prevent frequent start and stop. For example:

  - Start at the low liquid level, do not act at the middle liquid level, and stop at the high liquid level.

 V. Precautions

1. **Power-off Operation**: Be sure to disconnect the power supply before wiring to avoid electric shock.

2. **Model Matching**: The terminal definitions of relays of different brands may be different. Be sure to refer to the instruction manual (for example, the wiring of brands such as Chint and Delixi has slight differences).

3. **Sensor Type**: The float ball type is suitable for water towers/water pools, and the electrode type is suitable for conductive liquids (scale prevention is required).

4. **Protection Devices**: It is recommended to connect a circuit breaker and a fuse in series, and add overload protection to the water pump circuit.

5. **Polarity Issue**: There is no polarity for the AC power supply, but pay attention to the positive and negative poles for the DC control circuit.

 VI. Example of a Simple Circuit Diagram

(Note: In practice, please refer to the diagram in the instruction manual, or take a photo and provide the relay model for further guidance.)

If you provide the specific relay model (such as model JYB-714, XUK-1, etc.), the wiring scheme can be further refined! If the operation is complex, it is recommended to be completed by a professional electrician to ensure safety.