Sauer-Danfoss Launches Compliant Fan Drive Control for H1 Pump Family
Sauer-Danfoss recently unveiled a PLUS+1TM Compliant Fan Drive Control (FDC) for its H1 family of piston pumps. FDC for H1 pumps addresses Tier 4-compliant mobile off-highway equipment applications in machines above 20 kWh (27 hp) using closed-circuit technology; FDC offers proportional forward control with reversing and zero-speed capability, a maximum-displacement full forward speed fault position, and PLUS+1 compatibility.
As a result of Tier 4 diesel engine emissions regulations, many off-highway equipment manufacturers are switching from belt-driven fan drive systems to more efficient hydraulic modulating fan drives, which operate the fan speed at the lowest level required to maintain proper cooling. FDC for H1 pumps is a response to this shift in consumer demand, providing increased efficiency while decreasing fuel and power costs in most operating conditions.
The H1 pump family offers the reversibility and zero-speed capability inherent in robust closed-circuit systems at a lower cost than other plumbing systems. Reversing the direction of the fan clears any dirt and debris from the mechanism to maintain peak efficiency, while zero-speed capability is ideal for extremely cold conditions where cooling is unnecessary.
The closed-circuit system also allows a full forward speed fault position, enabling the fan to run at full speed in the event of a controller or electrical failure to maintain the integrity of the cooling system. Maximum speed is set by the Pressure Limiter Setting.
Hydraulic FDC for H1is available in 12V and 24V controls and is applicable on all H1 frame sizes. The hydraulic fan drive features increased power density and can be installed almost anywhere on the machine, offering an advantage over belt-driven fan drive systems, which take up more room and are less flexible with placement. This allows systems designers to improve system cooling by minimizing air flow path restrictions through the engine component.
Additional benefits include: higher pump & motor pressure and power & life ratings; fewer reservoir requirements, allowing for smaller reservoir size and minimizing contamination potential; and available motor speed sensors.