AHC15A Digital Power Weekly Programmable Time Switch User Manual

1. Product Overview

The AHC15A Digital Power Weekly Programmable Time Switch is a versatile electronic device designed for automated control of various electrical equipment. It features advanced pre-setting capabilities for daily and weekly programs, allowing for precise scheduling of power on/off cycles.

Key Features:

• DIN Rail Installation for easy mounting.
• Digital electronics with general purpose time switch functions.
• Supports 16 ON/OFF settings and 18 pulse programs.
• Manual ON/OFF control option.
• Time error correction of +/- 30 seconds weekly.
• Equipped with an LCD digital display and 6 function keys for easy programming.
• LED indicator light for operational status.
• Week and time resettable functions.

Figure 1: Front view of the AHC15A Digital Power Weekly Programmable Time Switch, showing the LCD display and branding.

2. Specifications

3. Setup and Installation

The AHC15A time switch is designed for DIN rail installation, making it suitable for integration into standard electrical panels and enclosures. Ensure all power is disconnected before beginning installation.

3.1. Mounting

1. Locate a suitable DIN rail within your electrical enclosure.
2. Align the time switch's DIN rail clip with the rail.
3. Press firmly until the device clicks securely onto the rail.

Figure 2: Side view illustrating the DIN rail mounting mechanism.

3.2. Wiring

Refer to the wiring diagram on the device or in this manual for correct connections. The device operates on AC 220V. Connect the input power to terminals 1 and 2. The output contacts are typically 3 (Common), 4 (Normally Open), and 5 (Normally Closed).

Important Safety Note: This product cannot directly control high current loads such as heating elements or large motors. For such applications, an external Solid State Relay (SSR) or AC Contactor must be used in conjunction with the time switch to handle the high current.

Figure 3: Top view showing the terminal connections for power input and output control.

4. Operating Instructions

The AHC15A features an LCD display and 6 function keys for programming. The protective cover can be lifted to access the buttons.

Figure 4: The time switch with its protective cover open, showing the programming buttons.

4.1. Initial Setup (Setting Time and Day)

1. Press the CLOCK button (often indicated by a clock icon) and hold it.
2. While holding CLOCK, press the D+ button to set the current day of the week.
3. While holding CLOCK, press the H+ button to set the current hour.
4. While holding CLOCK, press the M+ button to set the current minute.
5. Release the CLOCK button. The time is now set.

4.2. Programming ON/OFF Cycles

The device supports up to 16 ON/OFF programs. Each program consists of an ON time and an OFF time.

1. Press the PROG button (often indicated by a 'P' or 'PROG'). The display will show "1 ON".
2. Press D+ to select the day(s) for this program (e.g., MO, TU, WE, TH, FR, SA, SU, or combinations like MO-FR, SA-SU, MO-SA, etc.).
3. Press H+ to set the desired ON hour.
4. Press M+ to set the desired ON minute.
5. Press PROG again. The display will show "1 OFF".
6. Repeat steps 2-4 to set the OFF time for the same program.
7. Continue pressing PROG to cycle through "2 ON", "2 OFF", and so on, for up to 16 programs.
8. To exit programming mode, press the CLOCK button.

4.3. Manual Override

The MANUAL button allows you to override the programmed settings temporarily or permanently.

• Press MANUAL repeatedly to cycle through modes: ON AUTO OFF.
• ON: The output is continuously ON, ignoring programs.
• OFF: The output is continuously OFF, ignoring programs.
• AUTO: The device operates according to the programmed ON/OFF cycles.

4.4. Resetting the Device

To clear all settings and return the device to factory defaults, press the RESET button (often a small recessed button requiring a pointed object like a pen tip).

5. Maintenance

The AHC15A Digital Time Switch is designed for low maintenance. Keep the device clean and free from dust. Do not expose it to excessive moisture or extreme temperatures outside its specified operating range (-10°C to +40°C).

5.1. Battery Reserve

The device includes a built-in lithium battery for power reserve, which maintains the time and programmed settings during power outages. The battery has an estimated life of 3 years. If the display becomes dim or settings are lost frequently during power interruptions, the internal battery may need replacement by a qualified technician.

6. Troubleshooting

• Device not powering on:
  • Check the AC 220V power supply connections to terminals 1 and 2.
  • Ensure the power source is active.
• Programs not executing:
  • Verify that the device is in AUTO mode (check the display). Press MANUAL to cycle to AUTO if needed.
  • Double-check the programmed ON/OFF times and days for accuracy.
  • Ensure the current time and day are correctly set on the device.
• Output not switching for high current loads:
  • The AHC15A is designed for resistive loads up to 16A. It cannot directly control high current inductive or capacitive loads (e.g., heaters, large motors) without an intermediate relay.
  • If controlling high current, ensure an appropriate external Solid State Relay (SSR) or AC Contactor is correctly wired between the time switch and the load.
• Display is dim or settings are lost after power outage:
  • The internal lithium battery for power reserve may be depleted. While designed for 3 years, its life can vary.
  • Contact a qualified technician for battery inspection or replacement.

7. Warranty and Support

Specific warranty information for the AHC15A Digital Power Weekly Programmable Time Switch is not provided in this manual. Please refer to your purchase documentation or contact the retailer/manufacturer for details regarding warranty coverage.

For technical support or inquiries, please contact the manufacturer, Aexit, through their official channels or the vendor from whom the product was purchased.