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Hydrostatic Fan Drives
Fan Drive, Electro-Hydraulically Controlled with Gear Pump and Gear Motor
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To achieve very high accuracy or to control a number of temperatures, electronic temperature control is the technically sensible solution. Gear pumps and gear motors can be used for small to medium fan power outputs of up to 15 kW. The electronic cooler controller enables a very accurate control of coolant – and/or turbocharge air temperature, also during rapid load changes. Gear pumps and gear motors with electro-proportional bypass flow control are very suitable for these applications.
The internal gear motor features an electro-proportional relief valve. Excess flow, coming from the fixed pump is bypassed via this relief valve to the tank. This electro-proportional relief valve controls system pressure and fan speed, thus cooling performance. It can be integrated into the motor port plate.
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The electro-proportional bypass valve features a “fail safe” control that increases the pressure to full, i. e. maximum fan speed in the event of a power failure.
Advantages
- High control accuracy
- Sensing and evaluation of several operating parameters
- Fast response times
- Interface for diagnostic trouble shooting (optional)
In addition, there is the possibility to increase fan idling speed in anticipation of a heavy heat load, i.e. use of retarder.
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