1. Safety Precautions
- When used beyond the rated range of the coil, contact rating, and on/off life, there may be abnormal heating, smoking, and natural conditions. Please be aware.
- Although our company is committed to improving product quality and reliability, electrical components and equipment generally have a certain failure rate. In addition, durability may vary depending on the usage environment and conditions.
- When using, please make sure to confirm the actual machine according to the actual usage conditions.
- If continued to be used in a state of performance aging, abnormal heating, smoking, and fire may occur due to insulation aging.
- To prevent personal injury accidents, fire accidents, social damage, etc. caused by product failure or expiration of service life, please adopt safety design and regular maintenance measures such as lengthy design, fire and burn prevention design, and anti-misoperation design.
- When the relay is powered on, there is a risk of electric shock when touching the charging part. Please be aware.
- When installing, maintaining, and troubleshooting relays (including terminal blocks, sockets, and other connecting components), please cut off the power supply.
- When making terminal connections, please refer to the internal wiring diagram in the manual before connecting correctly.
- If the connection is incorrect, it may cause unexpected misoperations, abnormal heating, and natural conditions. Please be aware.
2. Product Overview
The ST3PA series time delay relay is an electronic time relay designed for use as a delay element in control circuits. It is suitable for AC 50Hz circuits with operating voltages up to 380V and DC circuits with operating voltages up to 220V. This relay allows for precise control of power connection or disconnection based on preset time intervals.
Key Features:
- Miniature size for convenient installation.
- Contact switching current: 5A, 10A.
- High sensitivity.
- Available with various terminal types.
- Gold-plated contacts (for certain models).
Figure 2.1: Front view of the ST3PA Time Delay Relay with time setting dial.
Figure 2.2: Rear view showing the 8-pin configuration for socket connection.
3. Specifications
General Product Properties:
| Property | Value |
|---|---|
| Brand Name | CNMAWAY |
| Model Number | ST3PA-A/B/C/D/E/F/G |
| Voltage | 12V, 24V, 220V (AC/DC depending on model) |
| Theory | Time Relay |
| Contact Load | Low Power |
| Use | General Purpose |
| Power Source | AC |
| Protect Feature | Sealed |
Technical Parameters (H3Y Series for reference):
| Parameter | H3Y-2 | H3Y-4 |
|---|---|---|
| Operating Voltage Range | DC: 75%-110%, AC: 80%-110% | |
| Rated Power Consumption | About AC:1.2VA DC0.9W | About AC:2.5VA DC1.5W |
| Rated Control Capacity | 5A/250VAC 30VDC | 10A/250VAC 30VDC |
| Contact Metal | Silver alloy | |
| Reset Time | <20ms | |
| Mechanical Life | ≥107 times (18000 Ops/h) | |
| Electrical Life | ≥105 times (18000 Ops/h) | |
| Ambient Temperature | -25℃ to +50℃ (non-freezing) | |
| Ambient Humidity | Max. 85%RH | |
| Insulation Resistance | ≥500MΩ (500VDC) | |
| Dielectric Strength (Coil to Contact) | ≥1500VAC for 1 minute | |
| Dielectric Strength (Open Contact) | ≥1000VAC for 1 minute | |
| Dielectric Strength (Contact Group) | ≥1000VAC for 1 minute | |
| Weight | Approx 35g | Approx 37g |
4. Product Dimensions
The ST3PA series relays are available in various configurations, each with specific dimensions and pin layouts. Below are general dimension diagrams for common types.
Figure 4.1: Top view of the ST3PA relay, showing the connection diagram and time range variation settings.
Figure 4.2: Product outline dimensions for various ST3P relay types (LY2, LY4, MY2, MY3, MY4) and their corresponding base sockets.
Figure 4.3: Pinout diagrams for LY2N, LY4N, MY2N, MY3N, MY4N relay types, illustrating connection points.
5. Installation
Proper installation is crucial for the safe and reliable operation of the time delay relay. Always ensure the power supply is disconnected before beginning any installation work.
5.1. Mounting the Relay
The ST3PA series relays are designed to be used with compatible base sockets. The relay typically plugs into the socket, which can then be mounted on a DIN rail or panel using screws.
Figure 5.1: ST3PA relay and its compatible base socket.
Figure 5.2: Various relay socket types (PYF08A, PYF14A, PTF08A, PTF08AK, PYF08.5A, PYF14.5A, PF083A, PF113A) and their dimensions.
5.2. Wiring Connections
Refer to the specific wiring diagram for your relay model to ensure correct connections. Incorrect wiring can lead to malfunction or damage.
Figure 5.3: Wiring diagram for H3Y-2 (2SPDT) and H3Y-4 (4SPDT) relays. Ensure input power is connected to terminals 2 and 7, and output contacts are wired according to the desired function.
General Wiring Guidelines:
- Power Input: Connect the appropriate AC or DC voltage to the designated power terminals (e.g., terminals 2 and 7 for 8-pin models).
- Output Contacts: Wire the load to the normally open (NO) or normally closed (NC) contacts as required by your application. Common (COM) terminals are typically shared.
- Grounding: Ensure proper grounding if applicable to your system.
6. Operation
The ST3PA series time delay relays offer various timing functions, primarily power-on delay and power-off delay, controlled by a front-mounted dial.
6.1. Setting the Time Delay
- Ensure the relay is powered off before adjusting settings.
- Locate the time setting dial on the front of the relay.
- Rotate the dial to select the desired time delay. The dial is typically marked in seconds (S) or minutes (M), with different ranges available depending on the specific model (e.g., 0.5S-3M, 1S-6M, 5S-30M, 10S-60M, 60S-6H, 2M-12H, 4M-24H).
- Some models may have a range selector switch in addition to the fine-tuning dial. Adjust both if present.
6.2. Power-On Delay Function
In power-on delay mode, the relay's output contacts will switch state only after the set time delay has elapsed, following the application of power to the coil.
6.3. Power-Off Delay Function
In power-off delay mode, the relay's output contacts will switch state only after the set time delay has elapsed, following the removal of power from the coil.
6.4. Operational Demonstration
The following video demonstrates the normally open and normally closed operations of the ST3PA relay, with a set time of 3 seconds.
Video 6.1: Demonstration of ST3PA relay's normally open and normally closed operations with a 3-second delay.
7. Maintenance
Regular maintenance helps ensure the longevity and reliable performance of your time delay relay.
- Periodic Inspection: Regularly check the relay and its connections for any signs of wear, damage, or loose wiring.
- Cleaning: Keep the relay free from dust and debris. Use a soft, dry cloth for cleaning. Do not use solvents or abrasive cleaners.
- Environmental Conditions: Ensure the operating environment remains within the specified temperature and humidity ranges to prevent premature aging or malfunction.
- Replacement: If the relay shows signs of consistent malfunction, abnormal heating, or physical damage, it should be replaced by a qualified technician.
8. Troubleshooting
If you encounter issues with your ST3PA time delay relay, refer to the following common troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| Relay does not power on/activate | No power supply; Incorrect wiring; Faulty power source; Incorrect voltage model. | Check power connections; Verify input voltage matches relay specifications; Ensure correct wiring according to diagram; Replace faulty power source or relay. |
| Incorrect timing/delay | Incorrect time setting; Faulty internal timing circuit. | Re-adjust the time setting dial; If problem persists, replace the relay. |
| Relay contacts not switching | Overload on contacts; Damaged contacts; Incorrect wiring to load. | Check load current against contact rating; Verify load wiring; Replace relay if contacts are damaged. |
| Abnormal heating or smoke | Overvoltage/overcurrent; Insulation breakdown; Faulty component. | Immediately disconnect power; Check input voltage and load current; Replace the relay. This indicates a serious fault. |
9. User Tips
- Verify Voltage: Always double-check the voltage rating of the relay (e.g., AC220V, DC12V, DC24V) before purchasing and installation to ensure it matches your application's power supply. Receiving a relay with an incorrect voltage rating can lead to incompatibility.
- Test Upon Receipt: It is recommended to test the relay's basic functionality upon receipt to confirm it is working as expected and matches the product description.
- Quality Assurance: Many users report satisfaction with the product's quality and functionality when correctly applied.
10. Warranty and Support
For any warranty claims, technical support, or inquiries regarding the ST3PA series time delay relay, please contact your original point of purchase or the manufacturer directly. Keep your purchase receipt as proof of purchase.