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Pump & Motor Controls For Closed Loop “Hydrostatic” systems 2009 Sales Meeting Control Overview System & Control Characteristics Pump Controls Motor Controls Team Exercise 2009 Sales Meeting Expectations? “Pump and Motor Controls Training” 2009 Sales Meeting Machine Functions = Systems What is the function of the machine? What problem is the customer trying to solve? (sales value) Performance needs of sub-function? What are the parameters we must control? as ◦ ◦ ◦ ◦ Speed / Ratio Torque Power Position 2009 Sales Meeting Examples Propel (Single path) Dual Path propel (track or wheel) Large drum mixer High rotational inertia load Winch Drives Conveyor drive ??? 2009 Sales Meeting Brevini PUMP CONTROLS Hydrostatic Pump Controls Direct Displacement Control Servo Controls ◦ With Feedback ◦ Non-Feedback Pressure Control ◦ Relief Valve ◦ Pressure Override Speed Sensing 2009 Sales Meeting Direct Displacement Control 2009 Sales Meeting Pump Design Stroke limiter Charge pressure setting Maximum pressure relief valve Servo Piston Maximum relief valve Stroke limiter 2009 Sales Meeting SH6V Pump Design Feedback linkage Displacement Control Servo piston Bushing Swashplate Piston Front bearing Rear bearing Input shaft Cradle bearing Charge pump Slipper Cylinder barrel 2009 Sales Meeting Swasplate pusher SH6V SERIES PUMP Model Controls SH6V 70 SH6V 130 SH6V 2009 Sales Meeting HEN HLR HE2 HIN HER HIR Controls with feedback HLR HIR Manual with lever Hydraulic proportional SH6V HER 2009 Sales Meeting Electric proportional HER+HIR also available Controls without feedback HEN Electric proportional HIN Hydraulic proportional SH6V 2009 Sales Meeting HE2 Electric 3 position HI2 Hydraulic 3 position Cut-off Valve Option Without cut-off Pressure cut-off Built in to 130 size Electric cut-off SH6V Pressure and electric cut-off Activating Cut-off will reduce pump flow 2009 Sales Meeting Flow vs. Control Handle Angle HLR Control 2009 Sales Meeting MANUAL LEVER CONTROL WITH FEED-BACK “HLR” Repeatable, accurate displacement settings with a given input signal. Handle override mechanism allows rapid changes in input signal without damaging the control mechanism. The servo control valve and swashplate are spring centered: No input signal = no pump flow. Pump will return to neutral after prime mover shuts down. Pump will return to neutral if external control linkage fails at the control handle or if there is a loss of charge pressure. 2009 Sales Meeting Hydraulic Proportional Control with FeedBack “HIR” Precision parts provide repeatable, accurate displacement settings with a given input signal. Simple – low cost design Pump will return to neutral: After prime mover shuts down If there is a loss of input signal pressure If there is a loss of charge pressure 2009 Sales Meeting Electric Proportional Control with FeedBack “HER” Precision parts provide repeatable, accurate displacement settings with a given input signal. Simple – low cost design Pump will return to neutral: 2009 Sales Meeting After prime mover shuts down If there is a loss of input signal pressure If there is a loss of charge pressure Hydraulic ON-OFF Control HI2 3 Positions: Full A, No Flow, Full B Pressurizing port Y1 or Y2 forces the pump swashplate to maximum displacement A or B. Removing pilot pressure will result in the swashplate moving to zero displacement. Electric ON-OFF Control HE2 3 Positions: Full A, No Flow, Full B Energizing one of two ON-OFF solenoids (24V or 12V DC), forces the pump to maximum displacement A or B Switching off both solenoids will result in the swashplate moving to zero displacement. 3 Position Controls Brevini MOTOR CONTROLS H2V Motor design Stroke limiters Sferical Valve Plate Bi-Mettallic Barrel Complete Range of Controls 2009 Sales Meeting Tapered Roller Bearing Motor Controls Fixed Displacement Two Position Proportional Displacement Pressure Compensated 2009 Sales Meeting H2V Motor Model Controls H2V 55 H2V 75 H2V 108 H2V 160 H2V 226 2009 Sales Meeting PI 2PI PE PE+PI EM 2EM LC 2EM+PE H2V Controls quick cross reference SAM Control PE Automatic Pressure Control PE100 Automatic Pressure Control PE+PI PE + Hydraulic Override PI(*) Hydraulic Proportional 2PI(*) Hydraulic 2 Position EM(*) Electroproportional Control 2EM Electric 2 position 2EM+PE 2EM + Pressure Control LC Manual Control (*) +PE Option also available. 2009 Sales Meeting Endcap Position – Control Logic 1 (Vgmax - Vgmin) Endcap Positon 2 ( Vgmin - Vgmax) • 2009 Sales Meeting M LC 2EM+PE EM+PE 2EM Electric Controls EM 2PI+PE PI+PE 2PI Hydraulic Controls PI PE+PI PE100 PE Pressue Controls • • • • • • • • • • • • • • • • H2V Mounting Position 2 1 From Max. to Min. PI EM 2PI 2EM PI + PE EM+PE 2PI +PE 2EM+PE LC 2009 Sales Meeting From Min. to Max. PE EM PE100 2EM PE+PI LC PI 2PI PE - Pressure Compensated Default to Min. Displacement Max ◦ High speed, Low torque If system pressure exceeds threshold, Displacement will increase ◦ Lower speed, Higher Torque 2009 Sales Meeting PE+PI- Pressure Compensated Similar to PE, except pressure setting can be decreased by X2 Pressure signal. Override PE (Pressure Comp) to Max Displacement Max 2009 Sales Meeting PI- Proportional Hydraulic Displacement Proportional to X2 Pressure signal. Optional: Default to Max or Min Displacement Max Max 2009 Sales Meeting EM- Proportional Electric Displacement Proportional to electical current signal. Optional: Default to Max or Min Displacement 12 or 24 V coils Max Max 2009 Sales Meeting 2PI- Two Position Hydraulic Max or Min Displacement – changed by X2 pressure Not proportional Optional: Default to Max or Min Displacement Max Max 2009 Sales Meeting 2EM- Two Position Electric Max or Min Displacement Not proportional Optional: Default to Max or Min Displacement 12 or 24 V coils Max Max 2009 Sales Meeting PI+PE: Propor. Hydraulic w/ Pressure Override Displacement Proportional to X2 Pressure signal. If system pressure exceeds threshold, Displacement will increase. (Overriding X2 command) Default to Min Displacement (X2 and System at low press) Max 2009 Sales Meeting 2PI+PE: Two Position Hydraulic w/ Pressure Override Max or Min Displacement – changed by X2 pressure Not proportional If system pressure exceeds threshold, Displacement will increase. (Overriding X2 command) Default to Min Displacement (X2 and System at low press) Max 2009 Sales Meeting LC- Manual Displacement Max 2009 Sales Meeting Adjust displacement by turning hand wheel Pump & Motor Combination Proportional Pump / 2 position Motor(s) Phased Pump & Motor Electronic Control Systems Dual Path Considerations 2009 Sales Meeting Team Exercise Form 4 teams Pick an application or function Prepare concepts for a drive system and two alternative control concepts. Present your solutions and describe why you chose them. ◦ Don’t worry about sizing components. ◦ Emphasize control strategies. 20 minutes to prepare 2009 Sales Meeting