Lenze 8200 vector inverters are available for power 0.55 to 90kW with 3-phase supply. In the more popular smaller sizes up to 22kW, a space saving variant can reduce the requirement for panel space by up to 40%. By dissipating the heat outside the cabinet, these ‘cold plate’ versions enable panels to have higher enclosure ratings.
Lenze has developed 8200 vector inverters using the ‘cold plate’ technique for cases
where the inverter can be mounted directly onto a substantial heat sink. Alternatively a plate with external cooling by liquid or air can be used. The cold plate versions of the 8200 vector inverters have no heat fins, so heat generated is passed to the mounting plate and transmitted out of the cabinet. In this way inverters require less mounting depth and the space savings are substantial. For a 1.5kW inverter the saving is 25%, rising to 40% for a 22kW inverter. Therefore panels can be smaller and costs reduced.
As the heat is now transmitted to outside of the cabinet, requirements for a flow of cooling air through the cabinet are removed. Cabinets can be sealed and protection to IP65 is easier to achieve. This is particularly advantageous in dusty conditions where any through flow of air would cause a dust build-up.
Above 22kW the cold plate design is not available. However an alternative ‘push-through’ design can be used right up to 90kW. Here the inverter heat sink is mounted outside of the panel, gaining the advantages of panel space and enclosure as described. Lenze inverters are available from Lenze Ltd and 18 StockDrives distributors through the UK and Ireland.