Theben DIMAX 540 plus B Mini Dimmer Instruction Manual

1. Introduction

The Theben DIMAX 540 plus B is an ultra-compact, flush-mounted mini dimmer designed for controlling dimmable LED and halogen lamps. Its small size allows for easy installation behind standard push-button switches, making it ideal for retrofitting and renovations. This dimmer operates without a neutral conductor, simplifying wiring. It features optimized settings for LEDs, adjustable minimum brightness, and a memory function to recall the last light setting.

Image 1.1: The Theben DIMAX 540 plus B mini dimmer, highlighting its compact and waterproof design.

2. Safety Information

WARNING: Electrical installation should only be performed by a qualified electrician. Disconnect power at the main circuit breaker before attempting any installation, maintenance, or repair work to prevent electric shock.

• Always ensure the power supply is disconnected before installation or maintenance.
• This device is designed for indoor use in dry environments unless otherwise specified for its IP rating. The DIMAX 540 plus B has an IP66 rating, indicating protection against dust and powerful water jets.
• Do not exceed the maximum load capacity of 150W for LED lamps.
• Ensure all connections are secure and comply with local electrical codes.
• Do not attempt to open or repair the device. Refer to qualified personnel for service.

3. Product Features

• Ultra-Compact Design: Extremely small dimensions (25.5 x 26.4 x 10.4 mm) for easy flush-mounted installation.
• No Neutral Conductor Required: Simplifies wiring, especially in older installations.
• Optimized for LEDs: Compatible with dimmable LED lamps from 2-150 W (phase cut).
• Adjustable Minimum Brightness: Allows fine-tuning for flicker-free dimming with various LED types.
• Memory Function: Stores the last set brightness level and restores it upon next activation.
• Quick 100% Brightness: Double-click the push-button to instantly reach 100% luminous intensity.
• Optimized Dimming Speed: Achieves 0% to 100% brightness in 5 seconds.
• Extended Cable Length: Supports cable lengths up to 100 m, suitable for three-way switch configurations.
• High Safety: Features temperature and overcurrent cut-off, and short-circuit protection.
• Versatile Load Compatibility: Suitable for R (resistive) and C (capacitive) loads (phase cut only).

Image 3.1: The compact size of the DIMAX 540 plus B, shown next to a 2 Euro coin.

4. Setup and Installation

Follow these steps for safe and correct installation of your DIMAX 540 plus B mini dimmer:

1. Disconnect Power: Before starting any electrical work, switch off the main power supply at the circuit breaker to avoid electric shock.
2. Prepare Installation Location: The dimmer is designed for flush-mounted installation behind a standard push-button switch in a wall box. Ensure there is sufficient space (dimensions: 25.5 x 26.4 x 10.4 mm).
3. Wiring Connections:
   • Connect the Live (L) wire to the dimmer's input.
   • Connect the Load wire (to the lamp) to the dimmer's output.
   • Connect the Switch Input wire from your push-button switch to the dimmer.
   • Note: This dimmer does not require a neutral conductor.

Image 4.1: Example of the DIMAX 540 plus B installed behind a standard push-button switch.

4. Secure the Dimmer: Carefully place the dimmer module into the wall box behind the push-button switch. Ensure no wires are pinched or damaged.
5. Optional LED Compensation Module: For optimal performance with certain LED lamps and to prevent flickering at low brightness levels, consider installing the optional LED compensation module (Theben item no. 9070825). Refer to the compensation module's instructions for installation.

Image 4.2: The DIMAX 540 plus B with the optional LED compensation module (item no. 9070825).

6. Restore Power: Once installation is complete and all connections are secure, restore power at the circuit breaker.

5. Operating Instructions

The DIMAX 540 plus B dimmer is controlled via a standard push-button switch:

• Switch On/Off: A short press (less than 0.4 seconds) of the push-button will switch the light on or off.
• Dimming: Press and hold the push-button to dim the light. The brightness will continuously increase or decrease. Release the button when the desired brightness is reached.
• 100% Brightness: A quick double-click (two short presses within 0.4 seconds) will set the light to 100% luminous intensity.
• Memory Function: The dimmer automatically saves the last set brightness level. When the light is switched on again, it will return to this stored brightness.
• Setting Minimum Brightness: To adjust the minimum brightness level (useful for preventing LED flickering at very low settings), press the push-button five times quickly. The light will then enter a programming mode where you can adjust the minimum level by pressing and holding. Once set, a short press will save the setting.

Image 5.1: Visual representation of light control and dimming effects in a room.

6. Maintenance

The Theben DIMAX 540 plus B mini dimmer is designed for maintenance-free operation. No user-serviceable parts are inside the device.

• Cleaning: If necessary, gently wipe the surface of the push-button switch (not the dimmer module itself) with a soft, dry cloth. Do not use abrasive cleaners or solvents.
• Inspection: Periodically check the installation area for any signs of damage or loose connections. If any issues are found, disconnect power and consult a qualified electrician.
• Disposal: Dispose of the device according to local electronic waste regulations at the end of its lifespan.

7. Troubleshooting

8. Technical Specifications

Image 8.1: Detailed dimensions of the DIMAX 540 plus B module.

Image 8.2: Technical data table for the DIMAX 540 plus B.

9. Warranty and Support

For warranty information, technical support, or service inquiries, please contact Theben customer service or your local distributor. Keep your purchase receipt as proof of purchase.

For further assistance, please visit the official Theben website or refer to the contact information provided with your product packaging.