| When it mixes molten steel...
The Magnetic Stirrer controller was developed for a European client involved in process control equipment for the steel industry. The Magnetic Stirrer is utilised to improve the purity and properties of the steel when cast. Semi-molten steel in a plastic state flows from the continuous caster through the centre of the Magnetic Stirrer coil where a slowly rotating field stirs the steel into a molten state. This stirring allows gas to escape, preventing closed flaws such as intrusions and pin holes, as well as providing even mould cooling to prevent billet cracking. Ten units rated at 480A have been delivered to the client's customer in Australia.
...or when it is heating aluminium
ANZ aluminium smelter uses electric heating to reheat molten aluminium from 680oC to about 720oC. In the past thermostat-like control had been achieved using SCR firing devices. Typically off-shore equipment was used to do this, however service, support and reliability were becoming issues so they looked for different alternatives and settled on using variable speed drives.
PDL Electronics Ltd AC variable speed drives were put onto 3 resistors with one Xtravert X716 per resistor bank. These are operating effectively to control the amount of heat, with PDL's service, support and reliability faultless.
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