The C-Bus Ceiling Sweep Fan Control Relay offers the ability for C-Bus input devices such as wall switches, DLT switches and touchscreens to natively switch speeds on ceiling sweep fans that regulate their speed using capacitors. Until now, this style of sweep fan speed control has been provided by using standard C-Bus relay devices in the switchboard enclosure, or by integration with third-party relay products. Housed in a 3 pole DIN-rail enclosure, the fan control relay offers the installer the ability to install the unit alongside 12 pole C-Bus output units inside 15 pole wide switchboards.

The C-Bus Ceiling Sweep Fan Control Relay is powered by the C-Bus network. This enables the control relay to handle ceiling fans that operate at a wide range of input voltages and frequencies. The electrically interlocked relays also provide the installer adjustable dwell time between speeds as well as double-pole switching when this is required.

There is a provision for the capacitor supplied with the fan to be housed in a compartment inside the fan control relay. The capacitor compartment is accessed by opening the hinged lid. When the fan control relay is installed behind the switchboard escutcheon, the capacitor cannot be accessed until the escutcheon is removed.

The fan control relay includes a manual override pushbutton that operates even if the unit has not been programmed for final operation. This lets the installing electrician test the fan provided C-Bus power is present.

Control

The fan control relay is designed to control virtually any 3-speed capacitor-controlled fan. However, you can use a single- or dual-speed fan, if desired. The control unit includes many options including Direct On Line (DOL) start and the control of the duration of the DOL start too. This ensures that the fan always starts at the highest speed. It is also possible to use a single button to step through the speeds from high through to low, then off. If single-button control is desired and a DLT style switch is providing the control, the current speed of the fan can be displayed on the label of the DLT. The labels are installer configurable, which enables the fan control relay to be used for other purposes, if so desired. It is possible to configure the control relay so that absolute speeds can be set too. This is useful when a scene includes the fan operating at a particular speed.

Design

The fan control relay is temperature rated up to 65° C, and is IP20 rated. When installed in the optional enclosure, it is suitable for installation directly into ceiling spaces. The enclosure provides segregation between the C-Bus and fan control wiring. Key locking on the enclosure and the fan control relay ensure they can only be assembled in the correct way. The enclosure also includes a C-Bus screw terminal strip with a small lead to the RJ45 connector on the fan control relay. The enclosure also includes multiple knockouts and cable tie-points to assist with installation. The enclosure is designed for surface mount installation and is suitable for higher temperatures such as in ceilings near fans where control is required. Mounting holes or keyhole mounting options are provided. Indicators are provided for both C-Bus and Unit status and for each of the three speeds. Multiple 20mm knockouts are provided to assist with cable entry or the fitting of cable glands.