1. Safety Precautions
Please read these safety precautions carefully before installation, operation, or maintenance.
- Risk of Overheating/Malfunction: 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.
- Product Reliability: Although our company is committed to improving product quality and reliability, electrical components and equipment generally have a certain failure rate. Durability may vary depending on the usage environment and conditions. Always confirm actual machine operation according to usage conditions.
- Insulation Aging: If continued to be used in a state of performance aging, abnormal heating, smoking, and fire may occur due to insulation aging.
- Safety Design: To prevent personal injury, fire accidents, and social damage 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.
- Electric Shock Hazard: When the relay is powered on, there is a risk of electric shock when touching the charging part. Please be aware.
- Power Disconnection: When installing, maintaining, and troubleshooting relays (including terminal blocks, sockets, and other connecting components), please cut off the power supply.
- Correct Wiring: 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 DH48S-S series is a versatile digital time relay designed for industrial control applications requiring precise timing. It features a digital display for easy time setting and monitoring, and supports repeat cycle operations. This series is available in various voltage options (12V, 24VDC, 220VAC) and contact configurations (SPDT, DPDT).
The H3Y series electronic time relays are also covered, offering similar delay functions with an analog dial interface, suitable for AC 50Hz and various control voltages.
Figure 2.1: DH48S-S Time Relay (Side View)
Figure 2.2: DH48S-S Time Relay (Front View)
Figure 2.3: H3Y Series Electronic Time Relay (Analog Dial)
3. Technical Specifications
3.1. General Parameters (DH48S Series)
| Parameter | Description |
|---|---|
| Model Number | DH48S-S (various configurations: -1Z, -2Z) |
| Theory | Time Relay |
| Power Source | AC (e.g., 220V), DC (e.g., 12V, 24V) |
| Contact Load | Low Power |
| Use | General Purpose |
| Size | Miniature |
| Certification | NONE (as per provided data) |
| is_customized | Yes |
3.2. Detailed Technical Parameters (DH48S Series)
| Parameter | Specification (MY2/MY3) | Specification (MY4/LY2/LY4) |
|---|---|---|
| Operating Voltage Range | DC: 75%-110%, AC: 80%-110% | |
| Rated Power Consumption | AC: 1.2VA, DC: 0.9W | AC: 2.5VA, DC: 1.5W |
| Rated Control Capacity | 3A/250VAC 30VDC (MY2/MY3) | 10A/250VAC 30VDC (MY4/LY2/LY4) |
| Contact Metal | Silver Alloy (Ag alloy) | |
| Reset Time | <20ms | |
| Mechanical Life | ≥107 operations (18000 Ops/h) | |
| Electrical Life | ≥105 operations (18000 Ops/h) | |
| Ambient Temperature | -25°C to +50°C (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 (MY2/MY3) | 74g (MY4/LY2/LY4) |
3.3. Detailed Technical Parameters (H3Y Series)
| Parameter | H3Y-2 | H3Y-4 |
|---|---|---|
| Working Power Supply | AC24V, 36V, 110V, 220V, 380V, 50Hz; DC24V, 110V, 220V | |
| Repetitive Error | ≤1% | |
| Working Mode | Power-on Delay | |
| Number of Contacts | 2 sets of delay changeover contacts | 4 sets of delay changeover contacts |
| Contact Capacity | 5A AC220V (resistive) | 3A AC220V (resistive) |
| Electrical Life | 1x105 operations | |
| Environment Temperature | -5°C ~ 40°C | |
| Weight (Approx.) | 60g | |
3.4. Product Dimensions
Figure 3.1: Product Dimensions (13F-LY and 13F-MY Series)
Figure 3.2: H3Y Series Outline Dimensions
4. Installation
Ensure power is disconnected before proceeding with installation to prevent electric shock.
4.1. Mounting and Terminal Types
The relays are designed for various mounting options:
- J: Plug-in terminal - For use with compatible sockets.
- P: PCB terminal - For direct mounting onto printed circuit boards.
- B: Flange mount plug-in - For panel mounting with a flange.
- H: Lateral flange, plug-in - For side-mounted panel applications.
Figure 4.1: DH48S-S Time Relay with 8-pin Socket
Figure 4.2: Various Relay Socket Types and Dimensions
4.2. Wiring Diagrams
Refer to the specific wiring diagram for your relay model to ensure correct connections. Incorrect wiring can lead to misoperation or damage.
Figure 4.3: DH48S-S Rear View and Basic Wiring Diagram
Figure 4.4: Detailed Wiring Diagrams for 13F-LY/MY Series
Figure 4.5: H3Y Series Wiring Diagrams
5. Operation
5.1. DH48S Series (Digital Display)
The DH48S series features a digital display and push-button controls for setting the delay time.
Figure 5.1: DH48S-S Front Panel Controls
Setting the Delay Time:
- Power on the relay. The digital display will show the current setting.
- Use the 'M' (Mode) button to select the desired time unit (e.g., seconds, minutes, hours).
- Use the '+' and '-' buttons to adjust the numerical value for the delay time.
- The relay will begin its timing cycle upon activation, and the display will count down or up depending on the mode.
Operating Modes:
- Time-limit operation/self-resetting: The relay operates for a set duration and then resets.
- Repeat Cycle: The relay can be configured for continuous on/off cycles with specified delay times.
Delay Range: 0.1 seconds to 60 minutes (or 0.1 seconds to 99 hours, depending on model and setting).
5.2. H3Y Series (Analog Dial)
The H3Y series uses an analog dial for time setting.
Setting the Delay Time:
- Rotate the dial on the front of the relay to the desired time setting.
- Ensure the power supply matches the relay's rated voltage.
Operating Mode: Power-on Delay. The relay starts timing when power is applied and activates its contacts after the set delay.
Delay Range: 0.1 seconds to 60 minutes.
6. Maintenance
Regular maintenance ensures the longevity and reliable operation of your time relay.
- Cleaning: Keep the relay and its socket free from dust and debris. Use a soft, dry cloth for cleaning. Do not use abrasive cleaners or solvents.
- Inspection: Periodically inspect the terminals for secure connections and signs of corrosion or overheating. Check the relay housing for any physical damage.
- Environmental Conditions: Ensure the operating environment remains within the specified temperature (-25°C to +50°C) and humidity (Max. 85%RH) ranges to prevent premature aging or malfunction.
- Power Disconnection: Always disconnect power before performing any maintenance or inspection.
7. Troubleshooting
If you encounter issues with your time relay, consider the following common problems and solutions:
-
Relay Not Activating/Incorrect Timing:
- Check power supply voltage and ensure it matches the relay's rating.
- Verify all wiring connections are secure and follow the correct diagram (refer to Section 4.2).
- Ensure the delay time is set correctly on the digital display or analog dial.
- Check for signs of damage or overheating on the relay or socket.
-
Abnormal Heating or Smoke:
- Immediately disconnect power.
- This could indicate an overload, incorrect wiring, or insulation aging. Refer to safety precautions and inspect for damage.
- Ensure the contact load does not exceed the rated control capacity (e.g., 5A or 10A).
-
Physical Damage Upon Receipt:
- Inspect the product immediately upon delivery for any broken screens or housing damage.
- If damaged, contact the seller or supplier for assistance.
-
Missing Components (e.g., bases/sockets):
- Verify the contents of your package against the product description and order details.
- Contact the seller or supplier if any expected components are missing.
8. User Tips
- The DH48S-S series is highly effective for precise timing in automation tasks, such as controlling coffee grinder dosers or other repetitive processes.
- Users often find the digital setup to be easy and quick, allowing for efficient configuration of delay and repeat cycle functions.
- When ordering multiple units, double-check that all necessary accessories, such as bases or sockets, are included in your shipment.
9. Frequently Asked Questions (FAQ)
- Q: Can this relay handle a 6A load?
- A: The rated control capacity varies by model. For MY2/MY3 models, the capacity is 3A/250VAC 30VDC. For MY4/LY2/LY4 models, it is 10A/250VAC 30VDC. Please check your specific model's specifications. A 6A load would be suitable for MY4/LY2/LY4 models but would exceed the rating for MY2/MY3 models.
- Q: I ordered multiple timers but did not receive the corresponding bases/sockets. What should I do?
- A: Please verify your order details and the package contents. If components are missing, contact the seller or supplier immediately to resolve the issue.
10. Item Guides & Documents
A user manual in PDF format is available for download. This document provides additional detailed instructions and diagrams.
User manual (PDF): View PDF