OSPE Steering Valve Technical Information Manual
Contents
1. Shock valves Suction valves Spool sleeve set Emergency steering check valve Gear set P check valve Mode select and EH cut off valve EH directional valve PVE control unit LVDT transducer Solenoid valve bridge SHS SF M D d AU P HMM a CH 12 13 14 15 16 17 18 19 20 21 22 P301 173 Control valve for mode select Pilot reduction valve 12 bar PP damping orifice Priority valve spool Priority valve spring Dynamic orifice Pilot pressure relief valve LS orifice LS check valve PVFC valve LS resolver Neutral spring package for spool sleeve When the engine is turned off the priority valve spool 15 is pushed to the left by the spring 16 The passage to the EF port is blocked and the passage to CF to the OSP spool sleeve set 3 and to the EH directional valve spool 8 is open 11068682 Rev DB May 2015 af Technical Information OSPE Steering Valve SASA Sensor Function When the engine is on and the steering unit OSP and EH is in neutral position the CF pressure will rise to match the spring force in the priority valve and the priority valve spool 15 will move to the right and the oil will pass from the pump across the integrated priority valve spool 15 and out through the EF port The priority valve is a dynamic type meaning that a flow passes from CF through the Dynamic orifice 17 integrated in sp2. 1 SASA sensor 2 OSP steering unit Caution Make sure that the spline profile of the SASA sensor is aligned to the spline profile of the steering column shaft A safe method of assembly is to place SASA sensor on the steering column spline shaft first and not opposite In case of using force there is a risk of bending the spline profile of SASA sensor For use of original steering column use adapter kit type SAK see sketch below Assembly SAK adapter kit SASA sensor and OSP steering unit 4 0 16 Se min 7 1 0 28 H L 27 5 et P301 222 1 Shaft of SAK adapter kit Distance plate of SAK adapter kit SASA sensor ewe NM OSP steering unit 11068682 Rev DB May 2015 43 Technical Information OSPE Steering Valve SASA Sensor Sensor type SASA Electric connection through cable mounted with an AMP Connector 150Z06 10 AMP type 2 967059 1 Pin 1 CAN Low Pin 2 supply voltage Pin 3 Gnd Pin 4 CAN High Mating connector assembly AMP type 2 965261 1 JPT contacts 2 962915 1 Wire sealing 828904 1 Recommended wiring practice e Protect all wires from mechanical abuse e Use a wire gauge that is appropriate for the sensor electrical mating connector e Use wire with abrasion resistant insulation e Separate high
3. 6 11068682 Rev DB May 2015 Technical Information OSPE Steering Valve SASA Sensor General General steering valve type OSPE On tractors combine harvesters maize harvesters and other simulate vehicles there is often a need for electrically actuated steering to make automatic GPS controlled steering possible Also manual steering with variable ratio is an often wanted feature to improve productivity and driver comfort For this purpose Danfoss has developed a combined steering unit and electro hydraulic steering valve named OSPE OSP for normal manual steering wheel activated steering and E for electro hydraulic steering activated by electrical input signal either from GPS or vehicle controller or from steering wheel sensor Danfoss type SASA for variable steering ratio In variable steering mode the electro hydraulic valve part adds flow to the metered out flow from the steering unit part of the OSPE OSPE has build in safety function in form of cut off valve which makes unintended steering from Electro hydraulic valve part impossible So OSPE is the right steering element first of all to build up steering system with very high safety level and so to be able to fulfill legislations demands like e g demands in EU Machinery Directive 2006 42 EC In cases where space do not allow room enough for OSPE an ordinary OSP non reaction steering unit combined the EH Electro Hydraulic In Line steering valve is an alternative EH
4. May 2015 Technical Information OSPE Steering Valve SASA Sensor A wide range of Steering Components F500 026 Danfoss is one of the largest producers in the world of steering components for hydrostatic steering systems on off road vehicles Danfoss offers steering solutions both at component and system levels Our product range makes it possible to cover applications of all types ranging from ordinary 2 wheel steering also known as Ackermann steering to articulated steering automatic steering e g by sensor and remote controlled steering via satellite We can offer more than 1 800 different steering units and 250 different priority valves categorized in types variants and sizes For hydrostatic steering systems Danfoss offers e Mini steering units with displacements from 32 to 100 cm rev 1 95 to 6 10 in rev flow up to 20 l min 5 28 US gal min steering pressure up to 140 bar 2030 psi e Steering units with displacements from 40 to 1200 cm rev 2 44 to 73 2 in3 rev flow up to 100 l min 26 4 US gaL min steering pressure up to 240 bar 3481 psi e Priority valves for rated flows at 40 80 120 160 and 320 l min 10 6 21 1 31 7 42 3 and 84 5 US gal min pressure up to 350 bar 5076 psi e Pilot operated flow amplifiers with amplification factors of 4 5 8 10 or 20 for rated oil flows of 240 and 400 l min 63 4 and 105 7 US gal min steering pressure up to 210 bar 3045 psi e Pilot operated steering v
5. Technical Information Steering OSPE Steering Valve SASA Sensor powersolutions danfoss com Technical Information OSPE Steering Valve SASA Sensor Revision history Table of revisions Date Changed Rev May 2015 Dimension drawing updated DB July 2014 Changed to Danfoss layout DA July 2011 Flow characteristics added CA October 2009 Major change BA August 2009 First edition AA 2 11068682 Rev DB May 2015 Technical Information OSPE Steering Valve SASA Sensor Contents A wide range of Steering Components General Versions Steering valve EHPS and electrical actuation PVE for EHPS Function Technical data Dimensioning Technical characteristics Dimensions Hydraulic systems System safety General steering valve type OS 7 ENGEM EE OSPEC LSRM cat OSPER EN SPEDE LSRIM TT 11 OSPEDFiLS A A A TAAT E A O ua eostdjesseensdisoaszbiseas 12 RA SR E E A E E AA A EAEE EE TA EEEE 13 OSPE steering KI 14 621 aa ES a l Ya Pa A DEA E E A E EEN EE ee 15 Neutral position 15 Steering right with steering wheel 17 Steering right With EH esses 19 PVES and PVED CLS electrical achuation ENEE 20 Closed loop Contro lannen Eres eE eN aii E SS ETER s EEIE N NIRE 20 Princip lesinant a A Ea AEA SE A E 20 INAUCLIVE transducer CMD d e ee 21 Integrated pulse Width modulation 21 PVED CLS EE A E L E E E E EEE EE 24 Hysteresis PVES and PVED CLS PVES a
6. Variants OSP Gear set cm3 rev Single 100 125 140 160 185 200 230 250 315 400 430 500 Dual D type 60 120 60 185 60 200 60 220 60 260 60 290 70 140 70 170 70 195 70 230 70 270 70 320 70 385 80 160 80 205 80 240 80 280 80 395 100 200 100 260 100 300 100 415 125 250 125 325 125 440 Spool sleeve C dynamic LSRM Load Sensing Reaction F dynamic LS Non Reaction Actuation module Type PVES2 PVED CC PVED CLS Connection AMP A Deutsch D Coil for control valve pilot dump Connection AMP A Deutsch D EH directional spool Cylinder flow I min 12 20 30 40 Priority valve With spool nominal flow l min 90 Spring force bar 7 10 With out spool No EF port present P flow determined by steering demand only Housing Thread Metric Relief valve Bar 100 210 Shock valves Bar 160 260 2 Only available with Deutsch 6 pin connector 3 Only available with Deutsch 12 pin connector 1 Housing threads 1 Housing threads P T amp EF L amp R LS Metric ISO 6149 1 M22x1 5 O S M18x1 5 0 S M12x1 5 O S O ring chamfer on port connection Spot face around port connection OSPEF w displacement lt 250 cc rev and integrated priority valve not to be used By experience we know the combination OSPEF with displacement lt 250 cc rev and integrated priority may
7. 30 or 40 l min 3 2 5 3 7 9 or 10 6 US gal min Spool travel EH directional spool 4mm 0 16 in Dead band EH directional spool nominal 0 8mm 0 03 in Priority valve Type Dynamic Spring force 7 bar 10 bar optional 100 psi 145 psi optional Nominal flow 90 l min 23 8 US gal min Oil temperature Recommended 30 gt 60 C 86 gt 140 F temperature Min temperature 30 C 22 F Max temperature 90 C 190 F Ambient temperature 30 gt 60 C 22 gt 140 F Oil viscosity Operating range 12 80 mm sec 66 0 370 3 SUS Min viscosity 10 mm2 sec 58 9 SUS Max viscosity 460 mm2 sec 2134 SUS Filtration Max contamination ISO 21 19 16 4406 Temperature difference Max 10 C 50 F between steering unit and other hydraulics Weight of OSPE Type Weight kg lb OSPE 100 12 7 28 0 OSPE 125 12 8 28 2 OSPE 140 12 9 28 4 OSPE 160 13 0 28 7 OSPE 185 13 1 28 9 OSPE 200 13 2 29 1 11068682 Rev DB May 2015 Technical Information OSPE Steering Valve SASA Sensor Technical data PVES Weight of OSPE continued Type Weight kg Ib OSPE 230 13 5 29 8 OSPE 250 13 4 29 5 OSPE 315 13 7 30 2 OSPE 400 14 1 31 1 OSPE 430 14 2 31 3 OSPE 500 14 5 32 0 Weight of OSPED
8. F Color 12 Vpc 9 1 33 Gray Terminals Amp Junior Timer Code AJ Pani Za ol VA SZ P102 541 Part number Voltage V Power W Part number 12 Vpc 16 D08 16 12D AJ 26 11068682 Rev DB May 2015 Technical Information OSPE Steering Valve SASA Sensor Technical data Deutsch Code DE RRR R R LG 45 2 n781 60 7 2 39 P102 538 Part number Voltage V Power W Part number 12 Vpc 16 D08 16 12D DE 11068682 Rev DB May 2015 27 Technical Information OSPE Steering Valve SASA Sensor Dimensioning Dimensioning steering system with OSPE steering valve The cylinder flow is determined from steering cylinder volume number of revolutions on steering wheel from lock to lock and steering speed Dimension of steering cylinder s can be based on formulas in General steering components page 29 31 Symbols V U steering cylinder volume i rev number of steering wheel revolutions from lock to lock Wc cm 3 rev steering system displacement for steering cylinder CQ l min nominal cylinder flow Pems bar emergency steering pressure Tems Nm emergency steering torque Fe N emergency steering wheel rim force Swd m steering wheel diameter Vvs cm3 rev d
9. gt K i EE Kees j LS EH i i ni 1 Tl Ll fr P301 170 10 11068682 Rev DB May 2015 Denpi Technical Information OSPE Steering Valve SASA Sensor Versions OSPEDC LSRM This version is preferred for front wheel steered vehicles like e g tractors where self alignment steering effect is desired Only difference compared to OSPEC LSRM is that D type has 2 gear wheel sets rotary meters Should the pump supply be lost only one gear set is active for emergency steering In normal steering situations both gear sets are active OSP REESEN 7 Electronics P301 171 11068682 Rev DB May 2015 11 Paa Technical Information OSPE Steering Valve SASA Sensor Versions OSPEDF LS This version is preferred for rear wheel steered and articulated vehicles Only difference compared to OSPEF LS is that D type has 2 gear wheel sets rotary meters This version however is shown without priority valve OSP l Fh H e EH ee pE 4 P301 172 12 11068682 Rev DB May 2015 Technical Information OSPE Steering Valve SASA Sensor Steering valve EHPS and electrical actuation PVE for EHPS PVED CL CLS PVED CL must not be promoted any longer PVED CL will be replaced by PVED CLS by the end of 2014 Please contact Danfoss Sales Organization for further details OSPE with an electrical pr
10. 56 65 0 2 56 OSPED dimensions Type L L2 L3 mm in mm in mm in OSPED 60 120 193 7 60 9 1 0 36 9 1 0 36 OSPED 60 220 205 8 07 9 1 0 36 20 8 2 39 OSPED 70 170 197 7 76 9 1 0 36 13 0 0 51 OSPED 70 320 216 8 50 9 1 0 36 32 5 1 28 OSPED 80 240 206 8 11 10 4 0 41 20 8 0 82 OSPED 80 395 226 8 90 10 4 0 41 40 9 1 61 OSPED 100 260 209 8 23 13 0 0 51 20 8 0 82 OSPED 100 300 214 8 43 13 0 0 51 26 0 1 02 OSPED 125 285 212 8 35 16 2 0 64 20 8 0 82 OSPED 125 440 232 9 13 16 2 0 64 40 9 1 61 32 11068682 Rev DB May 2015 Technical Information OSPE Steering Valve SASA Sensor Hydraulic systems OSPE in a system with fixed gear pump and GPS steering Display 1 L LFS LL R U Watchdog H d j controller H LO T E T el ie call Gh 7 i gt lt 7 EI EF T Oe a E P301 177 Working FT Prime K Hydraulic 4 mover F OC Z p UW The pump the OSPE priority valve part and the working hydra
11. Road mode When EH steering is powered off then OSPE behaves the same as a Reaction unit e Field mode When EH steering is powered on then OSPE behaves the same as a Non reaction unit MSR T o e a a P T d WH Electronics P301 168 11068682 Rev DB May 2015 9 Technical Information OSPE Steering Valve SASA Sensor Versions OSPEF LS This version is preferred for rear wheel steered vehicles like e g combines In both modes e Road mode When EH steering is un powered e Field mode When EH steering is powered the steering unit part behaves as a Non reaction steering unit The F spool type is preferred for steering systems where high level of negative steering forces may be present e g articulated steered vehicles OsP 7 R 8 R 7 R 7 7 E Cl itr L fe L l SU S hl Nor E 4 o T 1 L 1 1 1 i i i 1 i pri lr P lis etl see EH 1 t 1 100 F 4 1 T i NO APS l L H EI H FETTI 1 ee a
12. The sensor answers with a 0 on the status byte bit 0 The control unit then sends a setup message where byte 4 is set to OFh and byte 5 is set to FOh The first and second message shall match After receiving the last message the programming takes place in the sensor if the parameters are in the defined range the timeout period has not been exceeded and the CRC 16 check is correct in both messages After programming the status bit in the output message changes back from 0 to 1 Timeout period 1s between first message from controller and response from sensor and 1s between response from controller and second message from controller CRC 16 The standard CRC16 polynomial is used x4 16 x 15 xA2 1 Technical data Mechanical Input range Continuous 360 rotation Rotor torque lt 0 2 Nem Expected life gt 10 million cycles Electrical Supply voltage 9 32 Vpc Power consumption lt 1 W Output CAN V2 0B compatible to J1939 Termination resistor 120 ohm optional Baud rate 125 250 or 500 kb s Angle 12 bit word 0 4095 relative to a programmable 0 index point Resolution lt 0 1 Linearity 1 0 Angle change 16 bit integer with Ze complementary encoding for negative values 32768 to 32767 Safety function If a failure occurs the CAN bus will fail silent The CAN bus driver will be disabled Environmental Operating temperature 30 to 85 C 22 to 185 F Storage temperature 40 to 105 C S
13. cause oscillations in steering system Therefore do not specify such combinations We recommend using OSPEC when displacement is smaller than 250 cc and if integrated priority valve is needed Specify your wish to the OSPE according to the destinations as in the example underneath the empty scheme 11068682 Rev DB May 2015 37 Technical Information OSPE Steering Valve SASA Sensor Order specification Your wish OSPE Example OSPE 60 185 LsSRM 20 PVES D 90 m 180 240 PB Gear set type Spool sleeve Displacement Spool sleeve EH spool PVE Coil for ctrl valve Priority valve Prio vlv spring Housing thread Relief valve setting Shock valves setting Unit painted black 2 No designation for OSPE with single gear set 3 and 4 No designation for OSPE without priority valve Code numbers Code numbers for catalog versions with specifications Code numbers Specifications according to above description format 11081352 OSPE C 100 LSRM 12 PVES D D M 190 250 PB 11081366 OSPE C 125 LSRM 12 PVES D D M 190 250 PB 11081367 OSPE C 160 LSRM 12 PVES D D M 190 250 PB 11081369 OSPE C 200 LSRM 20 PVES D D M 190 250 PB 11081388 OSPE C 250 LSRM 20 PVES D D M 190 250 PB 11081389 OSPE C 315 LSRM 30 PVES D D M 190 250 PB
14. current wires such as feeds to solenoids lights alternators or fuel pumps from control wires Recommended minimum separation is 300 mm 11 8 in e Run wires along the inside of or close to metal machine frame surfaces where possible This simulates a shield which minimizes the effects of EMI RFI radiation e Do not run wires near sharp metal corners Run wires through grommets when rounding a corner e Provide strain relief for all wires e Avoid running wires near moving or vibrating components e Avoid long unsupported wire spans e All sensors have dedicated wired power sources and ground returns They should be used e Twist sensor lines about one turn every 100 mm 3 94 in e Use wire harness anchors that will allow wires to float with respect to the machine frame rather than rigid anchors 44 11068682 Rev DB May 2015 Technical Information OSPE Steering Valve SASA Sensor 11068682 Rev DB May 2015 45 Technical Information OSPE Steering Valve SASA Sensor 46 11068682 Rev DB May 2015 Technical Information OSPE Steering Valve SASA Sensor 11068682 Rev DB May 2015 47 Products we offer s Bent Axis Motors e Closed Circuit Axial Piston Pumps and Motors e Displays e Electrohydraulic Power Steering e Electrohydraulics e Hydraulic Power Steering e Integrated Systems e Joysticks and Control Handles e Microcontrollers and Software e Open Circui
15. gal min P301 218 30 11068682 Rev DB May 2015 Technical Information OSPE Steering Valve SASA Sensor Dimensions OSPE dimensions OSPE 157 244 4 0 05 1 DIE P301 176 11 Metric port version ISO 6149 1 P T EF M22 x 1 5 15 mm deep L R M18 x 1 5 14 5 mm deep LS M12 x 1 5 11 5 mm deep A 4x M10 x 1 5 16 mm deep OSPE dimensions Type L L2 mm in mm in OSPE 100 140 5 51 13 0 0 51 OSPE 125 143 5 63 16 2 0 64 OSPE 140 146 5 75 18 6 0 73 OSPE 160 148 5 83 20 8 0 82 OSPE 185 151 5 94 24 0 0 95 OSPE 200 153 6 02 26 0 1 02 OSPE 230 162 6 38 35 1 1 38 OSPE 250 160 6 30 32 5 1 28 11068682 Rev DB May 2015 31 Technical Information OSPE Steering Valve SASA Sensor Dimensions OSPE dimensions continued Type L L2 mm in mm in OSPE 315 168 6 61 40 9 1 61 OSPE 400 179 7 05 52 0 2 05 OSPE 430 183 7 20 55 9 2 20 OSPE 500 192 7
16. integration of electronics sensors and actuators into a single unit that interfaces directly to the OSPE steering valve body HN CH Fee 150H21 10 All the proportional actuators feature an integrated feedback transducer that measures spool movement in relation to the input signal and by means of a solenoid valve bridge controls the direction velocity and position of the directional spool of the valve The integrated electronics compensate for flow forces on the spool internal leakage changes in oil viscosity pilot pressure etc This results in lower hysteresis and better resolution Furthermore the electronics enable built in safety like fault monitoring directional indication and LED light indication Set point Solenoid Spool or Spool pos si valve bridge piston Feed back signal Transducer 157 503 10 Principle In principle the input signal set point signal determines the level of pilot pressure which moves the main spool The position of the directional spool is sensed in the LVDT transducer which generates an 20 11068682 Rev DB May 2015 Denpi Technical Information OSPE Steering Valve SASA Sensor Function electric feed back signal registred by the electronics The variation between the set point signal and feed back signal actuates the solenoid valves The solenoid valves are actuated so that hydraulic pilot pr
17. 11081390 OSPE C 400 LSRM 40 PVES D D M 190 250 PB 11081391 OSPE C 500 LSRM 40 PVES D D M 190 250 PB For weights please see Weights on page 22 38 11068682 Rev DB May 2015 Technical Information OSPE Steering Valve SASA Sensor Sensor type SASA Sensor type SASA general The SASA sensor detects the absolute position and speed of the steering wheel The sensor can be used in electro hydraulic steering systems using Danfoss EH or EHPS steering valves with programmable controller The use of SASA sensor is relevant e g for variable steering ratio and closed loop set ups where steering wheel position and steering angle have to match SASA is based on a non contact inductive principle giving a very high resolution The sensor features a robust design and resists e g electro magnetic radiation The output is a CAN signal which makes it easy to interface to advanced vehicle controllers The steering wheel shaft turns the rotor of the SASA sensor and the sensor is simply mounted between steering unit and steering column The shaft of the steering column must be 15 mm longer when using SASA sensor In cases where customers want to use the same steering column in applications with and without SASA sensors Danfoss offers an adapter kit type SAK to built in between column and sensor The SASA sensor offers the following features e High resolution lt 0 1 e Ou
18. 6 11068682 Rev DB May 2015 Technical Information OSPE Steering Valve SASA Sensor Function Steering right with steering wheel P301 174 oi amp Q 1 Shock valves 12 Control valve for mode select 2 Suction valves 13 Pilot reduction valve 12 bar 3 Spool sleeve set 14 PP damping orifice 4 Emergency steering check valve 15 Priority valve spool 5 Gear set 16 Priority valve spring 6 P check valve 17 Dynamic orifice 7 Mode select and EH cut off valve 18 Pilot pressure relief valve 8 EH directional valve 19 LS orifice 9 PVE control unit 20 LS check valve 10 LVDT transducer 21 PVFC valve LS resolver 11 Solenoid valve bridge 22 Neutral spring package for spool sleeve When steering with the steering wheel to the right the spool of the spool sleeve set 3 will rotate relative to the sleeve So LS line will be connected to R side LS pressure will raise accordingly to steering pressure required and priority valve spool 15 will be pressed to the left and oil will stream through the intern
19. EH directional valve PVE control unit LVDT transducer Solenoid valve bridge A A M D d Oh Um P H A O Emergency steering check valve Mode select and EH cut off valve 12 13 14 15 16 17 18 19 20 21 22 P301 175 Control valve for mode select Pilot reduction valve 12 bar PP damping orifice Priority valve spool Priority valve spring Dynamic orifice Pilot pressure relief valve LS orifice LS check valve PVFC valve LS resolver Neutral spring package for spool sleeve Before it is possible to steer with the EH part of the OSPE it is needed to power the control valve for mode select 12 for field mode When this valve is powered the pilot supply 12 bar is lead from the pilot reduction valve 13 through the control valve 12 to the solenoid valve bridge 11 of the PVE control unit 9 and in parallel to the mode select and EH cut off valve 7 So the valve 7 makes connection from EH directional valve 8 to the cylinder ports L and R In the same shift the valve 7 11068682 Rev DB May 2015 af Technical Information OSPE Steering Valve SASA Sensor Function interrupts the reaction circuit Lr and Rr from the spool sleeve set 3 to the cylinder ports and the unit acts as anon reaction OSP in this mode When an input signal is transmitted to the electrical connector of the PVE 9 in this example signal to steer to the right the solenoid valve bridge 11 is activ
20. Type Weight kg Ib OSPED 60 120 14 6 32 2 OSPED 60 220 15 2 33 5 OSPED 70 170 14 8 32 6 OSPED 70 320 15 5 34 2 OSPED 80 240 15 1 33 1 OSPED 80 395 15 8 34 8 OSPED 100 260 15 2 33 5 OSPED 100 300 15 4 34 0 OSPED 125 285 15 3 33 7 OSPED 125 440 16 0 35 3 PVES rated 11Vto32V Supply voltage Upc range 11Vto32V max ripple 5 Current consumption at rated voltage PVES 057A 12V 0 3A 24V Signal voltage neutral 0 5 x Upc CR port lt gt 0 25 Upc to 0 75 Upc CL port Signal current at rated voltage 0 25 mA to 0 70 mA Input impedance in relation to 0 5 Upc 12 KQ Input capacitor 100 nF Power consumption PVES 7W 11068682 Rev DB May 2015 23 Devt Technical Information OSPE Steering Valve SASA Sensor Technical data PVED CLS Hysteresis PVES and PVED CLS PVES and PVED CLS Supply voltage Function PVES Prop super s Disconnected by means Reaction time from neutral max 0 230 of neutral switch position to max spool travel rated 0 150 min 0 120 Disconnected by means Reaction time from max spool travel to neutral max 0 175 of neutral switch position fated 0 090 min 0 065 Constant voltage Reaction time from neutral position to max max 0 200 spool travel rated 0 120 min 0 050 Constant voltage Reaction time from max spool travel to neutral max 0 100 Pees rated 0 090 min 0 065 Information is under preparation Hystere
21. al CF side of the priority valve and on to the spool sleeve set 3 through the gear set 5 and out through the R connection In parallel the L side is opened through the spool sleeve set 3 to tank T When steering up against cylinder end stop pressure will raise in LS line according to setting of pilot 11068682 Rev DB May 2015 17 Devt Technical Information OSPE Steering Valve SASA Sensor Function pressure control valve 18 Check valve 20 avoids oil to stream backwards from servo side R in this case and over valve 18 to tank So the valve 18 shall only open for the dynamic flow generated in the dynamic orifice 17 of priority valve part independent if steering is done by the steering wheel OSP part or by the EH valve 18 11068682 Rev DB May 2015 Technical Information OSPE Steering Valve SASA Sensor Function Steering right with EH om Roig J D RRC 20 Shock valves Suction valves Spool sleeve set Gear set P check valve
22. alve with steering flow up to 100 l min 26 4 US gal min steering pressure up to 250 bar 3625 psi and with integrated priority valve for pump flow up to 120 l min 31 7 US gal min 11068682 Rev DB May 2015 5 Paa Technical Information OSPE Steering Valve SASA Sensor A wide range of Steering Components For electrohydraulic steering systems Danfoss offers Pilot operated steering valves pilot operated by hydrostatic steering unit or by electrical signal with steering flows up to 100 l min 26 4 US gal min steering pressure up to 250 bar 3625 psi Steering units with integrated electrical operated steering valve with steering flow up to 50 l min 13 2 US gal min steering pressure up to 210 bar 3045 psi Characteristic features for steering units Low steering torque From 0 5 Nem to 3 Nem in normal steering situations Low noise level Low pressure drop Many types available Open center Non reaction Open center Reaction Power Beyond Closed center Non reaction Load Sensing Load Sensing Reaction One or more built in valve functions relief valve shock valves suction valves non return valve in P line and in LS line Optional port connections according to ISO SAE or DIN standards Characteristic features for electrohydraulic steering systems with OSPE and EHPS Conversion factors Possibility of GPS row sensor variable steering ratio and joystick steering The possibility of manual
23. ated and the EH directional valve spool 8 is moved to the right So LS in the spool 8 will sense the needed steering pressure and this is transmitted to the PVFC valve LS resolver 21 So the valve 21 makes restrictions in the dynamic LS flow from dynamic orifice 17 of priority valve and the LS pressure in the priority valve spool 15 will match the LS pressure required from the EH directional valve spool 8 Accordingly the position of the priority valve spool 15 will change to match the flow demand for EH steering In case an external watch dog registers an unintended steering movement e g due to a false input signal to the PVE the electrical power to the control valve for mode select 12 must be switched off This must be controlled by the watch dog So valve 12 will dump pilot pressure to tank mode select and EH cut off valve 7 will change position so that connection from EH directional valve spool 8 to cylinder ports will be blocked Furthermore it will not be possible to activate the solenoid valve bridge 11 and the PVE will go into stay in neutral position In this way a true safe state is established The non reaction circuit from the OSP part is always connected to L and R cylinder ports independent of position of mode select valve 7 and so OSP steering is always possible PVES and PVED CLS electrical actuation Closed loop control The philosophy of Danfoss electro hydraulic actuation type PVE is
24. ccession change 16 bit integer with 2 s complementary encoding for negative values 32768 to 32767 4095 359 912 degrees 0 0 degrees 4095 359 912 degrees Status byte 7 6 5 4 3 2 1 0 Progamming mode Programming mode Normal state is 1 Response with a 0 when starting the programming sequence See the programming sequence described below under setup message CRC 16 The standard CRC16 polynomial is used x4 16 x 15 xA2 1 Parameter setup Setup message sensor can be programmed as shown in the CAN setup message below ocoh Data 0 1 2 3 4 5 6 7 Low byte High byte ID Baud rate Datarate Set 0 Programming CRC 16 index sequence Identifier 0COh 11 bit Baud rate Byte 0 is set to 02h for 125 kBaud 03h for 250 kBaud default 04h for 500 kBaud during the programming sequence Data rate Byte 1 is set to e 02h for 5 ms 03h for 10 ms default e 04h for 20 ms during the programming sequence 40 11068682 Rev DB May 2015 Denpi Technical Information OSPE Steering Valve SASA Sensor Sensor type SASA Set 0 index If byte 2 is set to AAh during the programming sequence the actual angle will be stored as a reference value 0 degree in persistent memory Programming The following sequence is used when programming the sensor sequence The controller unit sends a setup message where byte 4 is set to AAh and byte 5 is set to 55h
25. ealing IP65 EMI RFI Rating 100 V m Vibration Meets IEC 60068 2 64 Shock Meets IEC 60068 2 27 test Ea 11068682 Rev DB May 2015 41 Technical Information OSPE Steering Valve SASA Sensor Sensor type SASA Dimensions SASA sensor 44 4 21 75 z S at 2 L gt BP HESE St et 44 5 21 75 Ge 83 3 27 Se 4x 10 6 4x 20 42 I D 1 B L z SCH Z 9 1 Wio Tre 1 U U l k P301 221 SAK adapter kit 1 Flexible teeth 12 pieces to interact with splines on steering column 2 Cable 500 mm with connector See Code numbers for type of connector 12 0 47 La 84 3 31 gt 2110 43 R10 5 0 413 z S 2 N 55 8413 31 el 44 4 1 748 44 3 1 744 EE I d T min 14 0 55 41 5 1 634 150Z05 10 H Distance plate Shaft N Installation SASA has to be mounted between steering column and steering unit OSP with 4 bolts max 30 Nem 265 5 Ibfsin Shaft in column must be 15 mm 0 59 in longer when using SASA 42 11068682 Rev DB May 2015 Technical Information OSPE Steering Valve SASA Sensor Sensor type SASA Assembly SASA sensor and OSP steering unit Spin 22 4 0 88 17 0 67 ae d d L S e GN T UH 1 2 4 0 16 TY 153 P301 223
26. essure drives the directional spool into the correct position Inductive transducer LVDT Linear Variable Differential Transformer When the directional spool is moved a voltage is induced proportional to the spool position The use of LVDT gives contact free monitoring of the directional spool position This means an extra long working life and no limitation as regards the type of hydraulic fluid used In addition LVDT gives precise position signal of high resolution Integrated pulse width modulation Positioning of the directional spool in PVES is based on the pulse width modulation principle As soon as the directional spool reaches the required position modulation stops and the spool is locked in position 11068682 Rev DB May 2015 21 Technical Information OSPE Steering Valve SASA Sensor Technical data OSPE The technical data for OSPE are typical measured results For the hydraulic system a mineral based hydraulic oil with a viscosity of 21 mm s 102 SUS and a temperature of 50 C 122 F was used Gear set Single range 100 500 cm3 rev 6 1 30 5 in rev Dual range 60 120 125 440 cm3 rev 3 7 7 3 7 6 26 8 in3 rev Max pressure Port P EF 250 bar 3625 psi Port LS 210 bar 3045 psi Port L R 280 bar 4060 psi Port T 25 bar 362 psi Oil flow rated Port P EF 90 l min 23 8 US gal min Port L R steering wheel 50 l min 12 2 US gal min steering Port L R EH steering 12 20
27. est combination on gear sets for this OSPED type will be 80 395 So the numbers of steering wheel revolutions from lock to lock will be i V Wc 1850 395 4 7 turns lock to lock 28 11068682 Rev DB May 2015 Technical Information OSPE Steering Valve SASA Sensor Technical characteristics EH directional spools of OSPE Cylinder flow characteristic for directional spools Q 4 l min US gal min L 4 3 2 1 0 1 2 3 4mm R f t T d t d gt 580 492 328 164 0 164 328 492 580 Can T T T T T d gt 0 35 0 40 0 43 0 46 0 5 0 54 0 57 0 60 0 65 Us Upc P301 220 A valid for spools for nominal cylinder flow CQ 12 l min 3 17 US gal min B valid for spools for nominal cylinder flow CQ 20 l min 5 28 US gal min C valid for spools for nominal cylinder flow CQ 30 l min 7 97 US gal min D valid for spools for nominal cylinder flow CQ 40 l min 10 57 US gal min The curves are valid for OSPE with internal priority valve w 7 bar 100 psi spring and 1 0 mm 0 039 in dynamic orifice and 60 l min 15 85 US gal min pump flow For OSPE without internal priority valve the curves are valid in combination with external priority valve OLS 80 152B8269 60 l min 15 85 US gal min pump flow Pilot pressure relief valve P T Qp characteristic The pilot pressure relief valve protects the steering system against excessive pressure The pilot pressu
28. for all of our components Please contact the Danfoss Power Solution representative nearest you Local address Danfoss Power Solutions Danfoss Danfoss Shanghai Co Ltd Power Solutions GmbH amp Co OHG Power Solutions ApS Building 22 No 1000 Jin Hai Rd Krokamp 35 Nordborgvej 81 Jin Qiao Pudong New District DK 6430 Nordborg Denmark Phone 45 7488 2222 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 11068682 Rev DB May 2015 www danfoss com Danfoss A S 2015
29. ge exceeds 36 V and the main spool will return stay in neutral 2 Low supply voltage The solenoid valves are disabled when the supply voltage falls below 8 5 V and the main spool will return stay in neutral 3 Internal clock The solenoid valves are disabled when the internal clock frequency fails and the main spool will return stay in neutral On road operation A Warning The PVES or PVED CLS shall be de energized while driving on road It is the OEMs responsibility to establish the necessary means to inform and de energize the PVE from the cabin when driving on public roads The Danfoss range of PVE actuators are single string designs with limited on board fault monitoring Danfoss strongly recommends application of vehicle specific safety monitoring systems that will detect non conforming steering and effectively disable electro hydraulic actuators or issue appropriate warnings as the case may be A minimum safety system should include a manual power switch to electrical power off electro hydraulic actuators while driving on public roads For details see Technical information PVE Series A e User Manual PVED CL controller for Electro Hydraulics Steering or contact Danfoss Technical Support Team 36 11068682 Rev DB May 2015 Technical Information OSPE Steering Valve SASA Sensor Order specification Variants and order specification Specification table for Danfoss OSPE steering valve Part
30. he section will switch into an active error state 3 Supervision of the closed loop The actual position must always correspond to the demanded position input signal If the actual spool position is further than the demanded spool position gt 12 the system detects an error and will switch into an active error state On the other hand a situation where the actual position is closer to neutral than that demanded will not cause an error state This situation is considered in control When an active error state occurs the fault monitoring logic will be triggered Passive fault monitoring e A delay of 250 ms before anything happens e The solenoid valve bridge will not be disabled but still control the main spool position e An alarm signal is sent out through the appropriate pin connection no 3 e This state is not memorized When the erroneous state disappears the alarm signal will turn to passive again However the signal will always be active for a minimum of 100 ms when triggered To prevent the electronics from going into an undefined state a general supervision of the power supply and the internal clock frequency is made This function applies to PVES and will not activate fault monitoring 11068682 Rev DB May 2015 35 af Technical Information OSPE Steering Valve SASA Sensor System safety Safety considerations 1 High supply voltage The solenoid valves are disabled when the supply volta
31. isplacement steering unit PQ l min pilot flow Qpm l min pump flow minimum Example Cylinder volume V 1 85 0 49 US gal Required number of steering wheel revolutions from lock to lock i 4 5 revolutions The required steering system displacement for steering cylinder is calculated from We V i 1 85 1000 5 370 cm3 rev 22 58 in3 rev 1 85 1000 4 463 cm 3 rev 28 25 in rev In this example we chose Vvc 400 cm3 rev 24 4 in3 rev The nominal cylinder flow at 100 rpm speed on steering wheel CQ 400 100 1000 cm l 40 I min 10 57 US gal min In this case we try to use an D type steering unit to avoid emergency steering pump The small gear set which is the only hydraulically active gear set in emergency steering mode is determined by the demand for emergency steering pressure look in General steering components page 28 29 Emergency steering pressure Pems is calculated to be maximum Pems 40 bar 580 psi Maximum allowable steering torque Tems based on steering wheel rim force Fe 350 N and steering wheel diameter Swd 0 381 m Tems Fe Swd 2 350 0 381 2 66 7 Nm 580 Ibf in Emergency steering unit displacement can be chosen calculated from the table lowest on page 29 in General steering components The nearest displacement Vvs generating minimum 40 bar 580 psiJat Tws 66 7 Nem 580 Ibf in Vvs maximum 80 cm 3 rev 4 88 in rev So the clos
32. nd PVED CLS Installation DNED CL Senn 25 Coil of Control valve for mode select ENEE 25 Kiel dl e E 25 Electrical specification sscscissscssscssssestssscstassctesscsssssctenssesussatensestatdbvantagecsustaelituastasecscntstdsbeatatusadectin Eaa a aa EEEa E 26 TEMNA Siiri aeara AEA S EE a TA EA TA AE ERA ATi 26 Dimensioning steering system with OSPE steering valye EEN 28 FH directional spools OF OS PE ane eene ee Pilot pressure relief valve P T Qp characteristic E Pressure drop P EF for Danfoss OSPE Valve EENEG OSPE MMS DT 31 EIMEN GENCY STCOKIN OG E 35 OSPE and system safety PVES 35 Fault monitoring 7 Passive fall rom itor iin Opies EES 35 11068682 Rev DB May 2015 3 Technical Information OSPE Steering Valve SASA Sensor Contents Safety considerati eener 36 OM FOAAO PE Tat ON E 36 Order specification Variants and order specifications 37 ee CG 38 Sensor type SASA Sensor type SASA EC 39 Versions code numbers and weights for SASA Sensors 39 Code number and weight SAK adapter kt 39 CAN message protocols n airiai aE ENEE Eiere 40 NET lune D A0 Seille E EE 41 Mechapleah large geegergee de dieert eege Erde EREN ESE NA EE NAi anae 41 Electrical u nennen iaaa ELE Eeer 41 Output we 41 K IG d Al e el 41 Environmental wee A la De TEE 42 SAK adapter TTT 42 MEENA T 1 PAA AE E E E E T E EEA EER 42 Recommended wiring practice EENEG 44 4 11068682 Rev DB
33. o ensure steering capability in any case Alternative pressure protection must be present in working and in AUX hydraulic 34 11068682 Rev DB May 2015 Technical Information OSPE Steering Valve SASA Sensor System safety Emergency steering The steering unit part of the OSPE acts like any other OSP steering units in case of no pump supply In such case the gear wheel set acts as a hand driven pump and so muscular power will be converted from input torque and rotation on the steering wheel to hydraulic power in the form of pressure and flow out of the cylinder port to which side the steering is done See Dimensioning steering system with OSPE steering valve on page 28 in this catalog and page 28 in General steering components for calculating manual emergency steering Please see promotional brochure 11059881 for further information OSPE and system safety PVES Fault monitoring A fault monitoring system is provided in all PVES modules The system is available as passive fault monitoring type which provides a warning signal only e Passive fault monitoring systems are triggered by three main events 1 Input signal monitoring The PVES input signal voltage is continuously monitored The permissible range is between 15 and 85 of the supply voltage Outside this range the section will switch into an active error state 2 Transducer supervision If one of the wires to the LVDT sensor is broken or short circuited t
34. ogrammable module PVED CLS the following steering features in electro hydraulic steer mode field mode are possible e GPS steering e Row sensor camera steering e Joy stick or mini st wheel steering e Variable steering ratio e Speed depending steering ratio 11068682 Rev DB May 2015 Technical Information OSPE Steering Valve SASA Sensor Function OSPE steering valve 16 E FS P301 216 The OSPE steering valve includes the following main components 1 Shock valves 12 Control valve for mode select 2 Suction valves 13 Pilot reduction valve 12 bar 3 Spool sleeve set 14 PP damping orifice 5 Gear set 15 Priority valve spool 7 Mode select and EH cut off valve 16 Priority valve spring 8 EH directional valve 17 Dynamic orifice 9 PVE control unit 18 Pilot pressure relief valve 10 LVDT transducer 21 PVFC valve LS resolver 11 Solenoid valve bridge 22 Neutral spring package for spool sleeve 14 11068682 Rev DB May 2015 Technical Information OSPE Steering Valve SASA Sensor Function OSPEC LSRM Neutral position SR
35. ool 15 and into the LS line through the LS orifice 19 LS check valve 20 the PVFC valve 21 and into the spool sleeve set 3 In neutral position this dynamic oil flow passes on to the tank When the steering unit is in neutral position and control valve 12 is deactivated then the mode select EH cut off valve 7 makes connection through the Reaction circuit Lr and Rr So if the steering wheel is untouched and a delta P is generated in the steering cylinder oil will pass from L to R or R to L through the spool sleeve set 3 and gear set 5 and the steering wheel will rotate until it is grabbed or delta P disappears Only the force of the neutral spring package 22 has to be overcome to stop the rotation of the steering wheel and therefore stop the cylinder movement The mode select EH cut off valve 7 makes unintended EH steering impossible if e g a false input signal comes to the PVE control unit 9 when the control valve 12 is deactivated because L and R connections from EH directional valve spool 8 are blocked in 7 If the control valve 12 is activated then the mode select EH cut off valve 7 blocks connection through the Reaction circuit In this position there will be no reaction behavior even if there is build up delta P on the steering cylinder from forces on the steered wheels So the steering unit behaves as a Non reaction OSP In that situation If the control valve 12 is activated EH steering is possible 1
36. or Deutsch connector Grade of enclosure IP 66 IP 67 1 According to the international standard IEC 529 In particulary exposed applications protection in the form of screening is recommended Installation PVED CLS Information is under preparation Coil of control valve for mode select Below technical data are valid for coil of control valve for mode select when this coil is connected directly to the wiring of the application For OSPE with PVED CLS the coil will be connected to the PVED CLS further technical data will be added Specifications Duty cycle rating 100 Magnet wire insulation Class H 180C Ambient temperature 30 to 60 C 22 to 140 F Diodes are available contact your Danfoss representative 11068682 Rev DB May 2015 25 Technical Information OSPE Steering Valve SASA Sensor Technical data Environmental protection IP65 Input voltage tolerance 10 All AC coils are internally rectified DOS 16 watt coil f Maximum operating limit Ambient Temperature deg C 4 NWU ARUN e ee ee 2 N 70 80 90 100 110 120 130 140 Percent Rated Voltage P103 948E Electrical specifications 16 watt coils Voltage V Resistance Ohms 5 20 C 72 F Current draw A at 25 C 77
37. re relief valve works together with the priority valve in the OSPE to limit the maximum steering pressure P T The pilot pressure relief valve is set at an oil flow to the priority valve of 25 l min 6 6 US gal min Setting tolerance rated value 10 bar 145 psi 11068682 Rev DB May 2015 29 Technical Information OSPE Steering Valve SASA Sensor Technical characteristics RI BI psi bar L 3500 25 200 bar 30004 em 2900 psi 170 bar 2500 2465 psi 140 bar 150 l 2000 2030 psi 1500 199 1000 50 500 0 Qp 0 10 20 30 40 50 60 70 80 90 l min Qp t t t t d 0 5 10 15 20 US gal min V301 217 Pressure drop P EF for Danfoss OSPE valve This data comes from measurements on a representative sample of OSPE valves from production Oil with viscosity of 21 mm s at 50 C was used during measuring Measurement is made when the pressure on the LS connection is zero The minimum curve applies when the pressure on the EF connection is higher than the actual control spring pressure The curve for control spring pressure of 7 bar 100 psi and 10 bar 145 psi applies when pressure on the EF port is zero OSPE with priority valve spool REF RE psi bar 16 10 bar 200 14 145 psi 7 bar 12 102 psi min 150 10 8 100 6 50 j 2 0 0 Qp 0 10 20 30 40 50 60 70 80 90 l min eege 0 5 10 15 20 US
38. sis PVES and PVED CLS rated 0 1 Hysteresis is indicated at rated voltage and f 0 02 Hz for one cycle one cycle neutral gt full CL gt full CR gt neutral Spool travel 8 6 4 K R H o ial 0 2 4 6 8 157 669 11 Oil consumption Supply voltage Function PVES and PVED CLS Without voltage Pilot oil flow neutral 0 3 l min 0 078 US gal min With voltage Pilot oil flow locked 0 1 l min 0 026 US gal min continuous 0 8 l min 0 211 US gal min actuations 24 11068682 Rev DB May 2015 Technical Information OSPE Steering Valve SASA Sensor Technical data Oil viscosity Oil viscosity range 12 75 mm s 65 347 SUS min 4mm2 s 39 SUS max 460 mm s 2128 SUS Note Max start up viscosity 2500 mm s Oil temperature Oil temperature Rec range 30 60 C 86 140 F min 30 C 22 F max 90 C 194 F Filtering Filtering in the hydraulic system Max allowed degree of contamination ISO 4406 1999 version 23 19 16 Ambient temperature Ambiant temperatur range Rec 30 60 C 22 140 F Pilot pressure Pilot pressure relative to T pressure nom 13 5 bar 196 psi min 10 bar 145 psi max 15 bar 217 psi Enclosure and connector version Version of connector AMP JPT connect
39. steering even on very heavy vehicles EHPS High steering pressure requiring smaller cylinders and flow EHPS Low pilot pressure and flow giving extremely low noise in the cabin EHPS Can be combined with Danfoss PVG 32 proportional valve 1 Nem 8 851 Ibfein 11 0 264 US gal 1 N 0 2248 Ibf 1 bar 14 5 psi 1 mm 0 0394 in F 1 8 C 32 1 cm 0 061 in Survey of literature with technical data on Danfoss Steering Components Detailed data on all Danfoss steering components and accessories can be found in our steering component catalogues which is divided in to the following individual sub catalogues General information Steering components Technical data on mini steering units Technical data on open center and closed center steering units OSPM OSPB OSPC and OSPD Technical data on load sensing steering units priority valves and flow amplifiers OSPB OSPC OSPF OSPD OSPL OSPBX OSPLX OVPL OLS and OSQ Technical data on hydraulic and electrohydraulic pilot operated steering valves electrical actuation modules and appropriate steering units EHPS EHPS w OLS 320 PVE for EHPS and OSPCX Technical data on combined steering unit electrohydraulic steering valves OSPE and SASA and steering wheel sensors Technical data on load sensing steering unit with amplification OSPU For technical information on individual variants please contact the Danfoss Sales Organization
40. t Axial Piston Pumps e Orbital Motors e PLUS 1 GUIDE e Proportional Valves e Sensors e Steering e Transit Mixer Drives Comatrol www comatrol com Schwarzmiiller Inverter www schwarzmueller inverter com Turolla www turollaocg com Valmova www valmova com Hydro Gear www hydro gear com Daikin Sauer Danfoss www daikin sauer danfoss com Danfoss Power Solutions US Company 2800 East 13th Street Ames IA 50010 USA Phone 1 515 239 6000 D 24539 Neum nster Germany Phone 49 4321 871 0 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 our customers 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 Your Strongest Partner in Mobile Hydraulics Go to www powersolutions danfoss com for further product information Wherever off highway vehicles are at work so is Danfoss We offer expert worldwide support for our customers ensuring the best possible solutions for outstanding performance And with an extensive network of Global Service Partners we also provide comprehensive global service
41. tput CAN signal e High safety fail silent concept e PLUS 17 Compliant e Flanged in between steering unit and column e Compact design Versions code numbers and weights for SASA sensor Code number Type Supply Termination Cable length Connector Weigth voltage resistor kg lb 11088656 CAN 9 32Vpc Non 500 mm AMP code no 0 25 0 55 2 967059 1 11099289 CAN 9 32Vpc Non 500 mm Deutsch DT04 4P CE02 0 25 0 55 Code number and weight SAK adapter kit Code number Weight kg Ib 150Z6000 0 8 1 76 11068682 Rev DB May 2015 39 Technical Information OSPE Steering Valve SASA Sensor Sensor type SASA CAN message protocol Interface CAN 2 0 B Baud rate 125 kBaud 250 kBaud default 500 kBaud SASA returns cyclic the following CAN message every 5 10 default or 20 ms 301h Data 0 1 2 3 4 5 6 7 Low byte High byte Low byte High byte Low byte High byte ID Steering angle Count Steering angle change Status CRC 16 Identifier Steering angle Count Steering angle 301h 11 bit 12 bit word 0 4095 relative to a 0 index point 0 0 degrees 4095 359 912 degrees Overflow at 4095 for CW activation shall increment 0 Underflow at 0 for CCW activation shall decrement 4095 byte 0 255 Increments 1 for each message Difference between 2 transmitted position values in su
42. ulics must be protected by a separate pressure relief valve The vehicle controller watch dog monitors input from the GPS steering angle sensor SASA and signal from steering cylinder sensor In case of unintended movement from the cylinder sensor the watch dog shall remove power to the control valve for mode select pilot dump and in this way electro hydraulic actuation of steering cylinder is made impossible The system turns into true safe mode 11068682 Rev DB May 2015 33 Technical Information OSPE Steering Valve SASA Sensor Hydraulic systems OSPE in a system with variable pump and GPS steering Display Watchdog l d L EN controller Cea TI ba en P301 178 a Working Prime f 7 Hydraulic mover Zi ile Ly Lec KE The pump must have a built in pilot pressure relief valve to protect the OSPE the priority valve part the working hydraulics and the AUX function AUX can be a brake system which must have limited oil consumption t
43. valves are offered with the same safety functions as OSPE Please contact Danfoss sales organisation 11068682 Rev DB May 2015 7 Technical Information OSPE Steering Valve SASA Sensor Versions Overview Steering valve OSPE and electrical actuation module PVE Steering unit part Version Spool sleeve type Gear set OSPEC xxx LSRM C dynamic LSRM Load Sensing Reaction Single OSPEF xxx LS F dynamic LS Non Reaction Single OSPEDC xx yyy LSRM C dynamic LSRM Load Sensing Reaction Dual OSPEDF xx yyy LS F dynamic LS Non Reaction Dual EH part of OSPE in combination with any OSPE Spool type PVE actuator Static PVES PVED CC PVED CLS Priority valve in OSPE in combination with any OSPE Spool type Note Dynamic If priority valve is present elsewhere in system OSPE can be w o priority valve 8 11068682 Rev DB May 2015 Denpi Technical Information OSPE Steering Valve SASA Sensor Versions OSPEC LSRM This version is preferred for front wheel steered vehicles like e g tractors where self alignment steering effect is desired Reaction type steering resembles a car where the direction of travel will continue straight ahead when ever the steering wheel is not touched The reaction concept in any OSPE steering units is based on Danfoss RM technology The reaction effort is selectable by help of the solenoid valve for activating EH steering e
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