Introduction
The SINOTIMER TM-919B is a highly versatile 7-day, 24-hour programmable digital timer switch designed for automatic control of various electrical equipment. This device is ideal for applications requiring precise scheduling, such as street lamps, neon lights, water heaters, air conditioners, and agricultural facilities. Its robust design and user-friendly interface ensure reliable operation and easy setup.
Key features include a 30A load capacity, 16 ON/OFF programs, and a built-in rechargeable battery for memory backup during power failures. The timer is designed for DIN rail mounting, making it suitable for integration into electrical distribution boards.
Product Overview
Figure 1: Front view of the TM-919B Digital Timer, displaying the time and control buttons for programming.
Figure 2: Side view of the TM-919B, illustrating its compact design and the integrated DIN rail mounting clip.
Figure 3: Front view of the TM-919B with approximate dimensions: 8.7cm height, 6cm width, and 4.5cm depth.
Safety Precautions
Always disconnect power before installation or maintenance. Installation should be performed by a qualified electrician in accordance with local electrical codes. Do not expose the device to moisture or extreme temperatures. Ensure proper wiring to avoid damage to the unit or connected appliances.
Setup and Installation
- Mounting: The TM-919B is designed for DIN rail mounting. Securely attach the timer to a standard 35mm DIN rail within your electrical distribution board.
- Wiring:
- Connect the main power supply (220-240V AC, 50/60Hz) to the input terminals (typically marked L and N or 1 and 2).
- Connect the load (appliance) to the output terminals (typically marked 3, 4, 5 for a changeover switch). Refer to the wiring diagram on the device for precise connections. Ensure the load does not exceed 30A (resistive) or 15A (inductive).
- Initial Power-Up: After wiring, restore power. The display should illuminate. The built-in battery will begin charging, which may take a few hours for full capacity.
- Reset: If the display is erratic or you wish to clear all settings, press the "R" (Reset) button using a pointed non-metallic object. This will clear all programs and reset the clock.
Operating Instructions
Setting the Current Time
- Press the "P" button (Program) once to enter time setting mode.
- Press "D+" to set the current day of the week.
- Press "H+" to set the current hour.
- Press "M+" to set the current minute.
- To switch between 12-hour (AM/PM) and 24-hour format, press "P" and "H+" simultaneously.
- Press the "P" button again to exit time setting and return to normal operation.
Programming ON/OFF Cycles (16 Programs)
The timer supports up to 16 ON/OFF programs. Each program consists of an ON time and an OFF time.
- Press the "P" button repeatedly to cycle through the program settings (1 ON, 1 OFF, 2 ON, 2 OFF, ..., 16 ON, 16 OFF). The display will show "1 ON", "1 OFF", etc.
- When "1 ON" is displayed, use "D+" to select the day(s) of the week for this ON event. Options include individual days, weekdays, weekends, or all days.
- Use "H+" and "M+" to set the desired ON hour and minute.
- Press "P" again to move to "1 OFF". Set the day(s), hour, and minute for the OFF event using "D+", "H+", and "M+".
- Repeat steps 2-4 for any additional programs (up to 16).
- After setting all desired programs, press the "P" button until the display shows the current time, or wait for 30 seconds for it to automatically return to normal operation.
Manual Override
The timer has a manual override function to temporarily change the output state.
- Press the "MANUAL" button (or a button labeled with a hand icon, if present) repeatedly to cycle through modes:
- ON: Output is continuously ON.
- AUTO ON: Output is currently ON, following the program.
- OFF: Output is continuously OFF.
- AUTO OFF: Output is currently OFF, following the program.
- Select "AUTO ON" or "AUTO OFF" to ensure the timer follows the programmed schedule.
Maintenance
The SINOTIMER TM-919B is designed for low maintenance. Keep the device clean and free from dust. Do not use abrasive cleaners. The built-in rechargeable battery is designed for long life and typically does not require replacement under normal operating conditions. If the display frequently goes blank during power outages, the battery may need servicing by a qualified technician.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Display is blank. | No power supply; internal battery discharged. | Check power connections. Allow unit to charge for several hours after initial power-up. |
| Timer does not switch ON/OFF at programmed times. | Incorrect programming; manual override set to ON/OFF; current time incorrect. | Verify program settings. Ensure manual override is set to "AUTO ON" or "AUTO OFF". Correct current time. |
| Output is always ON or always OFF. | Manual override engaged. | Press the "MANUAL" button until "AUTO ON" or "AUTO OFF" is displayed. |
| Erratic display or unresponsive buttons. | System error; static electricity. | Perform a full reset by pressing the "R" button. Reprogram all settings. |
Specifications
| Parameter | Value |
|---|---|
| Model | TM-919B |
| Power Supply | 220-240V AC, 50/60Hz |
| Load Capacity | 30A (Resistive), 15A (Inductive) @ 250V AC |
| Programs | 16 ON/OFF settings per day/week |
| Minimum Interval | 1 minute |
| Time Range | 1 minute to 168 hours (7 days) |
| Internal Battery | 1.2V/40mA rechargeable (for memory backup) |
| Time Error Correction | ±30 seconds per week |
| Dimensions (L x W x H) | 87mm x 60mm x 45mm (approx. 8.7 x 4.5 x 6 cm) |
| Mounting | DIN Rail |
| Material | ABS + Electronic Components |
| Certifications | IEC 60367, CE |
Warranty and Support
Specific warranty information for this product is not provided in the available documentation. For warranty claims or technical support, please contact the retailer or manufacturer directly. Ensure you have your purchase receipt and product model number (TM-919B) ready when contacting support.
