Local Override

The channel indicator buttons on the front of the dimmer toggle the corresponding channel on and off, providing local override capability.

Each button illuminates only when its respective channel is in the ON state.

Local channel indicator buttons perform different functions depending on how they are pressed.

Operation	Function
Short-press (<0.5 second)	A single short press toggles the state of a channel.
Double Short-press	Two short presses in series return the channel to the C-Bus network level.
Long-press (1–2 second)	A long press on any local indicator button for one second or more returns all channels to the C-Bus network level.

A long-press on any local indicator button for one second or more returns all channels to the C-Bus network level.

NOTE: Double short-press and long-press operations only apply when the dimmer/channel is in local override mode.

By default, any C-Bus commands received by the dimmer will override local toggle changes. In this case, only the channel associated with the received commands will revert to the C-Bus network state. This option can be disabled in software using priority of operating modes.

Priority of the Operating Modes

The output status of a C-Bus DIN Rail Digital Dimmer can be changed by:

Pressing a C-Bus button
Activating any of the local toggle buttons (local override)
Using the Remote Override facility

The priority ranking of these actions is as follows:

Mode	Priority	Function
Thermal overload	1 (highest)	Channel automatically dimmed
Remote OFF	2	All channels OFF
Remote ON	3	All channels ON
Local override	4	Toggles the channel
C-Bus Input Unit (Wall plates, sensor etc)	5	Control the channel

Remote Override

The extra two pairs of the C-Bus network cable provide high priority override functions for most C-Bus Output units. The Green & Green/White pair is used for the Remote ON function. The Brown & Brown/White pair is used for the Remote OFF function.

Connecting either pair to the C-Bus negative pair activates the corresponding function.

The SpaceLogic C-Bus Network Automation and Application Controllers provide facilities to control these overrides.

IMPORTANT: During the installation, it is important to make sure these pairs are not left unplugged, as this may cause the override functions to be triggered by accident.

Power-Up Load Status

The dimmer has on-board non-volatile memory, which by default is used to store the operating state of each channel in case of power loss.

The SpaceLogic C-Bus Commission software allows the channels to be configured to restore any fixed level, or restore to their previous level upon restoration of power.

On restoration of power, the dimmer waits approximately 5 seconds for power to stabilize before restoring the channel states.