Last updated on Tue 03 Mar 2020

Mount Kelvin DALI FAQ

**Please note, this page gives answers to Mount Kelvin DALI, which may not be applicable to Mount Kelvin Mesh. Please see the Mesh documentation for information about the new product.

Which geographic areas is the Mount Kelvin DALI solution available in?

Mount Kelvin DALI can be used in European Economic Area.

No support for the Americas is on the roadmap at this time. See Q&A for the Mount Kelvin Mesh product for information about support in the Americas.

Can you use any DALI device on the market?

For LED drivers, all high quality DALI drivers should work. For other devices, please use one of the supported DALI devices. Other devices like input units or relays are likely to work well even outside the supported devices, while motion and other sensors are not.

If you need to use an unsupported device, please let us know which one and your use case for it, and we’ll help you find the right solution.

Can you control all types of devices through Bacnet or just HVAC systems?

The BacNet IP integration is built with AC units in mind, but adding device support for other devices can be investigated. Please let us know what you need and we’ll get back to you.

Do I get notified of broken / missing devices?

Currently there is no facility for notifying users about missing devices.

Can I get operating time reports for lights and other devices?

The Mount Kelvin app includes light intensity level information on per-space granularity. Additional reports can be built at an additional cost. Please contact us to discuss your needs.

Can your set timer like schedule from the front desk on a specific divice like floor heat bathroom?

Timers can be set to activate scenes, which gives quite a lot of flexibility. There currently is no support for floor heating thermostats, but a thermostat could be installed behind relay control, which would enable / disable floor heating based on it’s internal temperature setting.

What is typically included in your quotes?

For DALI based solutions, the quote typically includes the following items

  • Room Control Units including
    • Main Unit
    • 5V Power Supply (for the main unit) and power cable
    • External antenna for switches and sensor (attaches to main unit)
    • DALI power supply
    • DALI communications unit + control cable (to connect the main unit and communications unit)
  • Wireless, battery free switches and frames
  • Motion sensors (DALI) and other sensors (EnOcean)

Can I use a fire alarm system with Mount Kelvin DALI to control lights in the room?

Supporting a fire alarm system to control the lights in the room is possible, given that the fire alarm device in the room can provide a signal to a DALI Input unit. We can then configure the DALI input unit to turn on the room lights when an alarm is triggered. We do not support resuming the old light state after the alarm is cleared automatically, however from an end user standpoint it is better to have the lights on when they return to the room after the alarm - during the night an alarm might have the system resume to a light-off state, which is inconvenient.

The fire alarm control requires some customization and testing with the fire alarm devices used at the site, therefore this configuration is available only for larger installations of >100 rooms.

Are there any limits to group assignments?

There are very few limits in grouping, although the 64 device limit of DALI creates a degree of limitation.

Creating very large groups is fine, but having vary many can cause some odd effects when using push-dim (very many groups may cause some lights to lag behind).

Prefer large groups over many groups.

Can I disable the presence sensor if a scene is activated?

The presence sensor ‘On Movement’ event will not override a scene activated with a push button or via the app. The ‘On Absence’ event will, but this is logical: Lights will turn off after a while even in spaces where a push button was used to turn them on, as long as the space remains empty for a while.

Can I control all lights separatly if I want to?

Theoretically yes, if you map each device to it’s own group. In practice, this is not a good idea, any large site will have far too many luminaires for this to be practical.

How is Mount Kelvin programmed?

Programming is done with our mobile app.

How hard is it to hack a 868 mhz EnOcean switch?

Disturbing the lighting control system is quite difficult and the attacker has to be physically present on the site both in preparation for the attack as well as during it. In addition to technical difficulty and high chance of getting caught, conducting an attack requires special hardware and software which few people have. The combination of high risk, low reward and technical difficulty makes real world attacks unlikely. Assuming an attacker could compromise the wireless switches, what could they do? While difficult, the attacker might be able to turn lights around the building and on off and detect when nearby switches are pressed.