Lenze is now offering the full range of Lenze 8400 series inverters with cold plate mounting for the power range of 0.25 to 45kW. Removing the heat sink from the inverter gives a reduction in the volume of panel space required of about 25 per cent, as the substantial metal plate is considerably smaller than the heatsink that is conventionally fitted to the rear of frequency inverters.
Although the power to be dissipated is low, often below 100W, the low temperature differential to the surrounding air typically results in heat sinks that have significant dimensions. However, by mounting the inverter onto a substantial metal surface, cooling from the heat sink is no longer necessary. This reduces the depth required in the panel – in the case of larger inverters quite substantially; for example, 250mm reduces to 164mm at 18kW. Lenze offers a cold plate version of its 8400 StateLine, HighLine and TopLine inverters for single-phase supply power ratings of 0.25 to 2.2kW and three-phase power ratings of 0.37 to 45kW.
An additional design change has resulted in small cold plate inverters up to 3kW having a mounting width reduction from 102 to 70mm. Sid-by-side mounting without a gap is now possible and, in this case, the volume required in the panel reduces by more than 30 per cent compared to the previous cold plate model. Cold plate inverters are screw-mounted onto substantial metal surfaces that are flat, and the use of heat conducting paste is recommended.
The Lenze 8400 series are modern system inverters with a range covering from simple single-axis drives to networked multi-axis units, even for use with synchronous servo motors. An energy-saving feature included at no extra cost is VFC eco software that can save up to 30 per cent energy costs at partial loads. Profibus, Profinet and EtherCAT communications are optional, and CANopen is standard. A further option is Safe Torque off, which repays the extra cost by replacing external safety components and reducing control complexity.
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