Why Voltage Stability Matters in DALI Lighting Control
DALI (Digital Addressable Lighting Interface) systems use a unique method of communication where devices "talk" to each other by manipulating the voltage on the DALI line. When a device needs to send a signal, it does so by effectively shorting the line, which causes a current to flow.
To ensure the safety and reliability of this communication method, the DALI standard specifies a maximum limit for this current (250mA). This means that when a DALI device is sending a signal, it must be capable of handling up to 250mA of current flow without damage.
The biggest issue with voltage in DALI systems is maintaining the proper voltage range for reliable communication. The DALI standard specifies strict voltage requirements, mandating a maximum of 2VDC drop, which is understandable given that devices communicate by shorting the line.
The minimum VDC (at idle high, when nothing is communicating) should be 9.5V DC. If the voltage drops below this, it is likely to cause problems with the DALI system.
While many manufacturers offer power supplies with limited output, Creative Lighting devices maximise both current and voltage. The Control Freak UBi Power delivers approximately 245mA current limited power at 21VDC when at idle high. This higher power output provides contractors with significantly more headroom, reducing the risk of voltage-related issues in the field.
Key features of the UBi Power:
Enhanced Safety: Includes a UL listed overvoltage indicator and mains-rated banana jacks compatible with standard multimeter leads
Improved Distribution: The UBi Power allows for multiple branch distribution, reducing the risk of accidental shorting and improving fault-finding and cable management
Test Functionality: Quick Min/Max adjustment of the DALI line with a button press for efficient fault detection during installation
Compatible with ADDICT V3: Designed for seamless integration with the ADDICT V3 commissioning device
For contractors and system integrators looking to avoid voltage-related issues in their DALI projects, click here to learn more about Control Freak’s UBi Power.
If you would like to speak to our helpful team, you can contact us here.
