Basic function principles

Fig.3: KL2751, KL2761

The KL2751 (300 VA) and KL2761 (600 VA) dimmer terminals are intended for the direct connection of different AC lamp loads. Typical lighting devices such as incandescent lamps, inductive and electronic ballasts are detected and controlled in the right operation mode. In addition to automatic load detection, the Bus Terminal offers a short-circuit-proof and overload-proof output.

The KL2751 and KL2761 are extremely compact universal dimmers in Bus Terminal format and are aimed primarily at use in building services. The brightness values of the lighting system can be modified via the controller process data, based on any bus system supported by the Beckhoff I/O system. However, the universal dimmers can also be used as power switches for AC voltages. With a switchable power of 300 VA (W) or 600 VA (W), wear-free switching of numerous consumers is possible.

In the Automatic Recognition dimmer mode, the dimmer terminals can detect the load type and save the result. To do this the dimmer terminal switches the load on at low power for about 5 seconds after mains voltage is applied. The dimmer terminal cannot be controlled during this period.

The Zero Switch dimmer mode enables the gentle switching on and off of almost all loads. If the process data output value changes from zero to non-zero here, the output is switched on in the next voltage zero crossing. When the dimming value falls back to zero, the output is switched off in the next current zero crossing.

The dimmer terminal is short-circuit-proof. It limits the current in the event of a short circuit, thereby protecting the load and preventing triggering of the main fuse.

Notice
	Notes on operation Also read the notes on operation in the chapter Mounting and wiring.