Mining and tunneling
Enclosures in protection degree IP55 or higher, closed containers or also pressure-resistant encapsulation require a complete heat abstraction of the whole electrical drive unit. Therefore 100% of the losses must be dissipated by the cooling water. This can be done easily with an additional air/water heat exchanger. Thereby the monitored fans in the inverter provide the required air circulation inside the enclosure. The significant advantages of the Altivar 71Q for this application are:

Fans for internal air circulation are already built-in.
Full overload is available even in the smallest speed range.
"Low noise" requirements are optimally fulfilled due to the completely closed inverter unit.

Shredders
A dust loading even with conductive particles cannot be prevented around shredder drives, especially in case of recycling processes. As a result, special requirements regarding the protection degree are needed for the electrical installation. In a perfectly adapted drive system, sealing walls between the accessible connecting area, the inverter enclosure and the cooling enclosure prevent intrusion of dangerous particles. The significant advantages of the Altivar 71Q for this application are:

The inverter enclosure is securely closed and must not be opened for connection or start-up.
The very high starting torque is available unchanged also in case of frequent starting.
The monitored fans in the inverter as well as the air/water heat exchanger reliably provide the required cooling inside the inverter enclosure

Altivar 71Q

Water-cooled drives for heavy duty industry from 90 to 630 kW

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