Скачать или смотреть PTC Relay || PTC relay connections || Block Diagram

A PTC (Positive Temperature Coefficient) relay is a crucial component in the starting mechanism of refrigerator compressors. Here's a breakdown of how it works and its role:

Function and Operation

1. **Starting the Compressor**:
The PTC relay helps start the refrigerator compressor motor by providing a high initial current to the start winding, which assists in getting the motor up to speed.

2. **Current Regulation**:
As the relay heats up due to the current passing through it, its resistance increases (positive temperature coefficient). This rising resistance gradually reduces the current flowing to the start winding once the compressor reaches operational speed.

3. **Protection**:
The increased resistance effectively removes the start winding from the circuit, preventing it from overheating and ensuring that the compressor runs efficiently on the run winding alone.

Components

**PTC Element**: A ceramic material that increases in resistance as it heats up.
**Contacts**: Connect the compressor start and run windings to the power supply.

Troubleshooting and Maintenance

**Failure Symptoms**:
Compressor not starting.
Intermittent operation or frequent clicking sounds.
Overheating of the compressor.

**Testing**:
Use a multimeter to check the resistance of the PTC relay. A functioning PTC relay should show low resistance when cool and higher resistance when warm.

**Replacement**:
If a PTC relay is found to be faulty, replacing it is typically straightforward and involves disconnecting the old relay and connecting a new one to the compressor's start and run terminals.

Understanding the role and operation of the PTC relay can help in diagnosing and fixing issues related to refrigerator compressor starting problems.

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