Proven performance –exceptional efficiency
H1 Piston Pumps and Motors

6%
increasein efficiency makes
H1 your best choicefor optimum ower
and fuel economy

powersolutions.danfoss.com

Efficiency, functionality,and productivity
Stringent emissions regulations and tougher safety legislation
will have an impact on nearly every aspect of off-highway vehicle
development. New emissions regulations require more efficientsolutions in order to compensate for changes in engine power
levels, while new safety standards demand a morecomprehensive process of system development andqualification. With a proven range of H1 variable piston pumps
and motors, Danfoss can help you improve overall efficiency,
reduce development costs, and ultimately bring your vehicles tomarket faster.

override solenoid, while an Integral Speed Limitation (ISL) circuit
improves vehicle braking while preventing engine overspeed. With proven 32 degree bent axis technology, zero degreecapability and higher overall efficiency, our H1 bent axis motors
also offer significant advantages. The H1 propel system provides
improved horsepower management, and enables advanced
anti-slip or wheel-assist control functions. H1 systems can also beoptimized to match the requirements of specific vehicle functions.
By adjusting software parameter settings, you can offer a range ofvehicle control concepts using the same hardware.

Greater total efficiency
Today’s vehicles need more effective systems that maximize theuse of available engine power. To improve overall efficiency, H1
pumps are designed to reduce rotating group, control and charge
pump losses, which helps save fuel, frees power for other vehicle
functions and enhances operating performance and productivity.
Furthermore, our H1 bent axis motors have a six percent efficiency
gain at maximum displacement (high torque working cycle),compared to comparable products on the market. Better
efficiency means you can use smaller engines on some vehicles,
reduce heat load and increase power to the ground.

SIL 2 certified automotive control
Our new H1 Automotive Control (H1 AC) is an innovative SIL 2certified solution (Safety Integrity Level 2 according to IEC 61508),
that helps reduce vehicle development and qualification
expenses. Using intelligent software, the characteristics of thehydrostatic transmission can be adjusted to suit specific operating
requirements. Combining state-of-the-art technology and25 years of electronic automotive control development,
H1 AC not only helps increase vehicle performance and efficiency,
but also provides improvements in productivity and comfort.

Functionality and flexibility
Our H1 pumps are designed to improve vehicle operation. For
example, a tandem Control Cut Off (CCO) circuit will safely disable
both pump controls in the absence of the proper signal to theThe H1 family• Greater overall vehicle efficiency• SIL 2 certified Automotive Control(H1 AC)• Optimized for modern control
systems• Improved fuel economy andreduced heat load
• Proven operating performanceand increased productivity

H1 efficiency– maximize available engine power
Higher output speeds, lower input speeds and a reduced total
installed lifecycle cost – our closed circuit variable displacement
axial piston pumps and bent axis motors are designed forefficiency. H1 pumps minimize control and charge pump losses,
which maximizes available engine power. In addition, our H1 bent
axis motors offer significant improvements in overall efficiency
and an extremely low pressure drop within the fluid galleries ofthe motor. This helps you to improve fuel economy and provides
power savings for other vehicle functions – enhancing operating
performance and increasing productivity.
Our H1 bent axis motors feature a unique design that minimizes
flow losses throughout the operating range of the motor. At
2000 rpm and 250 bar system pressure, the improvement
is approximately six percent above the nearest comparable
product*. That’s a gain of around 5.5 kW (7.4 HP) to the ground.
The result is improved fuel economy (5.5 kW at 1000 working
hours/year, equates to €1600/year saved), and a reduced heat load
placed upon your vehicle cooling system.
* All products have been measured on the same test stand, at the same time, using thenewest comparable products on the market.

X

Output...
Power

Hose/Fitting

Calculation of Cost, Fuel, CO2 Emissions Savings
Units

Customer:

Imperial

MetricCurrency

Project:

USD

Specific fuel consumption:

215

EUR? g/kW-h? kg/l? kW

Density of diesel fuel:

0,875

Average power savings:

5,5Working hours per day:

10hours

Working days per year:

100days

Diesel fuel price:

1,2

€/l

CO2 production per unit of fuel:2,69? kg/l

Fuel savings per year:

1351

l

Cost savings per year:

1621

€

CO2 emissions savings per year:

3634

kg

Figure 1: Based on our verified data we can calculate costand emissions savings for your off-highway vehicles.

Greater total efficiency• Minimum control losses• Improved charge circuit• Improved kit efficiency• Lower control pressure• Bent axis motor with optimized valve segment• Additional functionality with PLUS+1®
Functionality and flexibility• Integral automotive pump and motor control
functions• Control override• Integral speed limitation• Optional integral sensors (pressure, angle, speed)• Optional electronic operated pressure limiter• Bent axis motor with zero degree capability• Optional electrical pressure compensation withelectrical brake pressure defeat

Expanded functionality
and higher efficiency
Our H1 Automotive Control (H1 AC) is the first solution on themarket to offer the precision and consistent performance ofintelligent electronics, combined with complete drive system
functionality, system qualification and SIL 2 certification. You
will be able to reduce time to market for new vehicles and modelvariants, while still customizing vehicle behavior and providing
differentiation for your products.
The H1 embedded controller features robust electronics mounted
directly on the H1 pump. The controller also incorporates additional“watch dog” circuitry, which provides you with real-time fault
monitoring of the electronic hardware. Combined with optional
software to monitor redundant HMI input channels, H1 AC providessingle fault tolerance for AC vehicle transmission systems, withprogramming to bring the H1 pump to a defined ‘safe state’ in theevent of signal loss or interruption – SIL 2 certified by technicalinspection agency TÜV Nord (Technischer Überwachungs-Verein).

Optimized for modern control systems• Integral electronic automotive control• One electrical displacement control for all pumps• Best in class EDC and PLUS+1® Compliant• SIL 2 electronic automotive control (H1 AC)• 4 electrical pump control options (EDC, NFPE,electronic AC or FNR)
• 2 electrical motor control options (2-position orproportional)

Figure 2: The H1 embedded controller (mounted on theH1 pump) helps OEMs to meet the requirements of therevised European Machinery Directive 2006/42/EC andrelated safety standard (ISO 13849-1:2006), reducing
the cost and time required for system qualification andvehicle certification.

Designed for quality and reliability• One design concept• Reduced part count• Single piece swash plate• Fewer control variants• Reduced electric displacement control (EDC),
part countInstallation and packaging benefits• Length-optimized pumps and motors• Minimum one clean side• Higher corner HP/package size ratio• Integral control function• Standardized connector interface

Consistent and reliablevehicle performance
PLUS+1® – customized vehicle solutions
Whether using H1 pumps and PLUS+1® microcontrollers – or H1pumps with embedded electronics – time to market goes down.
Pre-engineered and pre-programmed propel system functions
are easily user configurable. With the PLUS+1 Service Tool AC
software service screens, you can configure up to 4 different
operator-selectable system modes with varying vehicle drive
behaviors to meet a variety of application requirements. Alongwith the convenience of automotive control, you also keep theversatility of non-automotive and creep automotive modes.
Additional benefits include your ability to further customize
hydraulic pump and motor displacement control profile andramp times, provide constant speed drive functionality, interface
to vehicle systems via CAN, and easy-to-use diagnostics.

Mode switch A

Mode switch B

Drive/Creepsignal

Drive/Creep signal

Mode switch B

F/N/R

Inch signal

Mode switch A
Inch signal

Brake light

F/N/R

Motor speedsignal

Gear boxFault LED

Reverse alarm
Piston pump
(H1 AC with embeddedmicrocontroller)

Motor speed
signalReversealarm

Proportional
displacement signal

Parking brake

Gear box

Proportional
displ. signal

Brake light

Parking brake

Microcontroller(PLUS+1®)

Fault LED

Variable motor(H1B)
Piston pump
(H1)

Figure 3: Solution Using H1 Pump with Integrated AC Controller.

Variable motor(H1B)

Figure 4: Solution Using H1 Pump with NFPE Control and Automotive on PLUS+1®.

PLUS+1® Compliant – the intelligent liaison
Optimizing around electronic control is the future of mobile
machinery – because tomorrow’s electronically controlled engines
are going to need electronically controlled pumps and motors. H1
is fully PLUS+1® Compliant to interface seamlessly with Danfoss’
electronic vehicle control architecture.

Combined, the H1 family and PLUS+1 system form a genuinely
intelligent liaison offering superior solutions for off-highway
OEMs in agriculture, construction, road building, materials
handling, forestry, turf care and special purpose vehicles.

AboutDanfoss Power Solutions
Danfoss Power Solutions is a global manufacturer and supplier of high-quality
hydraulic and electronic components. We specialize in providing state-of-the-art
technology and solutions that excel in the harsh operating conditions of the mobile
off-highway market. Building on our extensive applications expertise, we work
closely with you to ensure exceptional performance for a broad range of off-highway
vehicles. We help OEMs around the world speed up system development, reduce
costs and bring vehicles to market faster.
Danfoss Power Solutions – your strongest partner in mobile hydraulics.
Products we offer:• Bent Axis Motors• Closed Circuit Axial Piston Pumps and Motors• Displays• Electrohydraulic Power Steering• Electrohydraulics• Hydraulic Power Steering• Integrated Systems• Joysticks and Control Handles• Microcontrollers and Software• Open Circuit Axial Piston Pumps• Orbital Motors• PLUS+1® GUIDE• Proportional Valves• Sensors• Steering• Transit Mixer Drives

Wherever off-highway vehicles are at work, so is Danfoss Power Solutions. We
offer you expert worldwide support for ensuring the best possible solutions foroutstanding performance. And with an extensive network of Global Service Partners,
we also provide you with comprehensive global service for all of our components.
Go to www.powersolutions.danfoss.com for further product information.
Danfoss Power Solutions (US) Company2800 East 13th StreetAmes, IA 50010, USA
Phone: +1 515 239 6000

Danfoss Power Solutions ApS
Nordborgvej 81
DK-6430 Nordborg, Denmark
Phone: +45 7488 2222

Danfoss Power Solutions GmbH & Co. OHG
Krokamp 35
D-24539 Neumünster, Germany
Phone: +49 4321 871 0

Danfoss Power Solutions Trading(Shanghai) Co. Ltd.
Building #22, No. 1000 Jin Hai Rd
Jin Qiao, Pudong New District
Shanghai, China 201206
Phone: +86 21 3418 5200

Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products
already on order provided that such alterations can be made without changes being necessary in specifications already agreed.
All trademarks in this material are property of the respective companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.

11039168_Rev DA_Sep 2014