Controllable resistive load, 0.3

All-purpose heavy-duty three-phase resistive load with adjustable power consumption up to 0.3 kW. The resistance of each phase is separately adjustable in 15 steps from 7020 Ω to 470 Ω. Coloured LED strips on the front indicate the level and status of the load.

The load is designed for teaching trainees or students the basics of power electronics and power engineering.

It provides three different modes of operation.

Direct manual control via pushbuttons on the device: In this stand-alone mode, no further control devices are required and the load can easily be integrated into existing set-ups. Both, balanced load configurations and unbalanced configurations are supported.

Remote control: The resistive load can also be controlled via the analogue input 0 V...10 V, e.g. with the Power Analyser CASSY Plus. This allows a direct control of balanced load levels as well as a triggered or scenario-based switching of the resistors. For control via the Power Analyser CASSY Plus, both the CASSY Lab 2 measurement software and the Lab Docs interactive instruction sheets can be used. Scenarios are made possible by the LabView support of the Power Analyser CASSY Plus. With the analogue control input, the unit can be used in many applications, e.g. in control engineering.

Triggered switching: Triggered switching of a user-defined balanced or unbalanced load configurations is also possible via the control input. In this way, the influence of loads on transformers or generators can be investigated and demonstrated.

In each mode, the load can be switched off immediately via the OFF button.

As a compact unit, it can be used in an experiment frame or as a table-top unit.

For cooling, load-controlled fans allow for a continuous operation.

In order to detect a critical overload, the phases are monitored individually for temperature and are also fitted with burn-off-proof resistors.

An internal phase detection system ensures that switching takes place at the ideal time, so that experiments are easily reproducible and spikes in voltage are avoided.