Technical Information
Bent Axis Variable Displ. Motors
Series 51 and 51-1
powersolutions.danfoss.com
Technical Information
Series 51 and 51-1 Bent Axis Variable Displ. Motors
Revision history |
Table of revisions |
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Changed |
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October 2017 |
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Modified theor. corner power ratings and updated to Engineering Tomorrow |
0401 |
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March 2015 |
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Major update. Corrected DITA CMS structure, layout, colors and all tables. |
CA |
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Jan 2014 |
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Converted to Danfoss layout - DITA CMS |
BA |
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Jun 2005 |
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First version |
AA |
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2 | © Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 |
Technical Information |
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Series 51 and 51-1 Bent Axis Variable Displ. Motors |
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Contents |
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Series 51 general information |
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Sectional view of Series 51, proportional control................................................................................................................. |
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Sectional view of Series 51-1, two-position control............................................................................................................. |
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Pictorial diagram............................................................................................................................................................................... |
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System circuit diagram................................................................................................................................................................... |
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Series 51/51-1 name plates........................................................................................................................................................ |
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Technical specifications |
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General specifications.................................................................................................................................................................. |
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Specific data..................................................................................................................................................................................... |
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Fluid specifications........................................................................................................................................................................ |
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Determination of nominal motor size.................................................................................................................................... |
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General technical specifications |
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Case pressure................................................................................................................................................................................... |
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Speed range..................................................................................................................................................................................... |
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Pressure limits................................................................................................................................................................................. |
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Loop flushing................................................................................................................................................................................... |
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Minimum displacement limiter................................................................................................................................................ |
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Hydraulic fluids............................................................................................................................................................................... |
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Temperature and viscosity......................................................................................................................................................... |
18 |
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Filtration system ............................................................................................................................................................................ |
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Fluid selection................................................................................................................................................................................. |
19 |
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Reservoir............................................................................................................................................................................................ |
19 |
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Independent braking system.................................................................................................................................................... |
19 |
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Motor bearing life.......................................................................................................................................................................... |
20 |
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External shaft loads....................................................................................................................................................................... |
21 |
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External shaft load orientation.................................................................................................................................................. |
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Radial and thrust loads to the output shaft.................................................................................................................... |
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Allowable external shaft load, when shaft load distance is different from standard................................. |
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Efficiency graphs and maps....................................................................................................................................................... |
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Speed sensor................................................................................................................................................................................... |
25 |
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Typical control and regulator applications........................................................................................................................... |
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Controls circuit diagram – nomenclature – description |
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Option N1NN – hydraulic two-position control for 51-1 (frame size: 060, 080, 110)............................................. |
27 |
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Option HZB1 – hydraulic two-position control for 51 (frame size: 160, 250)........................................................... |
28 |
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Options TA** – pressure compensator control for 51-1 (frame size: 060, 080, 110).............................................. |
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Option TACA: pressure compensator configuration with hydraulic Brake Pressure Defeat......................... |
31 |
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Options TAD1, TAD2, TAD7: pressure compensator configuration with electric BPD.................................... |
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TAD* solenoid connectors............................................................................................................................................... |
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Option TAC2: pressure compensator configuration without Brake Pressure Defeat...................................... |
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Options TA** – pressure compensator controls for 51 (frame size 160, 250).......................................................... |
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Option TAC0: pressure compensator configuration with hydraulic Brake Pressure Defeat......................... |
34 |
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Option TAC2: pressure compensator configuration without Brake Pressure Defeat...................................... |
34 |
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Options TH** – hydraulic two-position control for 51-1 (frame size: 060, 080, 110)............................................. |
35 |
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Pressure Compensator OverRide (PCOR)......................................................................................................................... |
35 |
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Option THCA: pressure compensator configuration with hydraulic Brake Pressure Defeat......................... |
36 |
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Options THD1, THD2, THD7: pressure compensator configuration with electric BPD.................................... |
36 |
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THD* solenoid connectors............................................................................................................................................... |
37 |
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Option THC2: pressure compensator configuration without Brake Pressure Defeat...................................... |
37 |
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Options TH** – hydraulic two-position control for 51 (frame size 160, 250)............................................................ |
38 |
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Pressure Compensator OverRide (PCOR)......................................................................................................................... |
38 |
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Option THC0: pressure compensator configuration with hydraulic BPD............................................................ |
39 |
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Option THC2: pressure compensator configuration without Brake Pressure Defeat...................................... |
39 |
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Options E1B1, E2B1, E7B1 – electrohydraulic two-position control for 51-1 (frame size 060, 080, 110)........ |
40 |
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E1B1, E2B1, E7B1 solenoid connectors............................................................................................................................. |
41 |
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Options E1A5, E2A5 – electrohydraulic two-position control for 51 (frame size 160, 250)................................. |
42 |
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E1A5, E2A5 solenoid connectors......................................................................................................................................... |
43 |
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Options F1B1, F2B1 – electrohydraulic two-position control for 51-1 (frame size 060, 080, 110).................... |
44 |
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F1B1, F2B1 solenoid connectors......................................................................................................................................... |
45 |
© Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 | 3 |
Technical Information |
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Series 51 and 51-1 Bent Axis Variable Displ. Motors |
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Contents |
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Options F1A5, F2A5 – electrohydraulic two-position control for 51 (frame size 160, 250)................................. |
46 |
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F1A5, F2A5 solenoid connectors......................................................................................................................................... |
47 |
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Options T1**, T2**, T7** – electrohydraulic two-position control for 51-1 (frame size 060, 080, 110)........... |
48 |
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Option T*CA: pressure compensator configuration with hydraulic Brake Pressure Defeat.......................... |
49 |
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Options T*D1, T*D2, T* D7: pressure compensator configuration with electric BPD...................................... |
49 |
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T1D1, T2D2, T7D7 solenoid connectors...................................................................................................................... |
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Option T*C2: pressure compensator configuration without Brake Pressure Defeat....................................... |
50 |
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Options T1**, T2** – electrohydraulic two-position control for 51 (frame size 160, 250)................................... |
51 |
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Option T*C0: pressure compensator configuration with hydraulic Brake Pressure Defeat.......................... |
52 |
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Option T*C2: pressure compensator configuration without Brake Pressure Defeat....................................... |
52 |
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T1C2, T2C2 solenoid connectors................................................................................................................................... |
52 |
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Options EP**, EQ** – electrohydraulic proportional control for 51 (all frame sizes)............................................. |
53 |
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Pressure Compensator Override (PCOR).......................................................................................................................... |
54 |
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Options EPA1, EQA1: pressure compensator configuration with Brake Pressure Defeat.............................. |
55 |
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Options EPA2, EQA2: pressure compensator configuration without Brake Pressure Defeat....................... |
55 |
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Options L1B1, L2B1, L7B1 – electrohydraulic proportional control for 51 (all frame sizes)................................ |
56 |
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L1B1, L2B1, L7B1 solenoid connectors.............................................................................................................................. |
57 |
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Options D7M1, D8M1 – electrohydraulic proportional control with PCOR and hydraulic BPD for 51 |
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(all frame sizes)........................................................................................................................................................................ |
58 |
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Options D7M1, D8M1: pressure compensator configuration with hydraulic Brake Pressure Defeat........ |
59 |
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D7M1, D8M1 solenoid connector.................................................................................................................................. |
59 |
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Options HS** – hydraulic proportional control for 51 (all frame sizes)...................................................................... |
60 |
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Pressure Compensator OverRide (PCOR)......................................................................................................................... |
60 |
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Option HSA1: pressure compensator configuration with Brake Pressure Defeat............................................. |
61 |
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Option HSA2: pressure compensator configuration without Brake Pressure Defeat...................................... |
61 |
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Option HZB1 – hydraulic proportional control for 51 (all frame sizes)....................................................................... |
62 |
General dimensions – frame size 060 |
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SAE flange design per ISO 3019/1............................................................................................................................................ |
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DIN flange design per ISO 3019/2............................................................................................................................................ |
67 |
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Cartridge flange.............................................................................................................................................................................. |
70 |
General dimensions – frame size 080 |
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SAE flange design per ISO 3019/1............................................................................................................................................ |
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DIN flange design per ISO 3019/2............................................................................................................................................ |
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Cartridge flange.............................................................................................................................................................................. |
79 |
General dimensions – frame size 110 |
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SAE flange design per ISO 3019/1............................................................................................................................................ |
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DIN flange design per ISO 3019/2............................................................................................................................................ |
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Cartridge flange.............................................................................................................................................................................. |
88 |
General dimensions – frame size 160 |
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SAE flange design per ISO 3019/1............................................................................................................................................ |
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DIN flange design per ISO 3019/2............................................................................................................................................ |
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Cartridge flange.............................................................................................................................................................................. |
95 |
General dimensions – frame size 250 |
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SAE flange design per ISO 3019/1............................................................................................................................................ |
97 |
Dimension – Controls |
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Options TA** for 51-1 – Pressure Compensator Control (Frame Size: 060, 080, 110)........................................... |
99 |
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Options TA** for 51 – Pressure Compensator Control (Frame Size: 160, 250)...................................................... |
100 |
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Options TH** for 51-1 – Hydraulic Two-Position Control (Frame Size: 060, 080, 110)........................................ |
101 |
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Options TH** for 51 – Hydraulic Two-Position Control (Frame Size: 160, 250)..................................................... |
102 |
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Options E*B1, F*B1 for 51-1 – Electrohydraulic Two-Position Control (Frame Size: 060, 080, 110)............... |
103 |
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Options E*A5, F*A5 for 51 – Electrohydraulic Two-Position Control (Frame Size: 160, 250)........................... |
104 |
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Options T1**, T2**, T7** for 51-1 – Electrohydraulic Two-Position Control (Frame Size: 060, 080, 110)..... |
105 |
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Options T1C2, T2C2 for 51 – Electrohydraulic Two-Position Control (Frame Size: 060, 080, 110)................. |
106 |
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Options EPA1, EQA1 for 51 – Electrohydraulic Two-Position Control (All Frame Sizes).................................... |
107 |
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Options L1B1, L2B1, L7B1 for 51 – Electrohydraulic Two-Position Control (All Frame Sizes).......................... |
108 |
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Options D7M1, D8M1 for 51 – Electrohydraulic Two-Position Control (Frame Size: 060, 080, 110)............. |
109 |
4 | © Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 |
Technical Information
Series 51 and 51-1 Bent Axis Variable Displ. Motors
Contents
Options D7M1, D8M1 for 51 – Electrohydraulic Two-Position Control (Frame Size: 160, 250)....................... |
110 |
Option HSA* for 51 – Hydraulic Proportional Control (All Frame Sizes).................................................................. |
111 |
Option HZB1 for 51 – Hydraulic Proportional Control (All Frame Sizes)................................................................. |
112 |
© Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 | 5 |
Technical Information
Series 51 and 51-1 Bent Axis Variable Displ. Motors
Series 51 and 51-1 variable displacement motors are bent axis design units, incorporating spherical pistons.
These motors are designed primarily to be combined with other products in closed circuit systems to transfer and control hydraulic power. Series 51 and 51-1 motors have a large maximum / minimum displacement ratio (5:1) and high output speed capabilities. SAE, cartridge, and DIN flange configurations are available.
A complete family of controls and regulators is available to fulfill the requirements of a wide range of applications.
Motors normally start at maximum displacement. This provides maximum starting torque for high acceleration.
The controls may utilize internally supplied servo pressure. They may be overridden by a pressure compensator which functions when the motor is operating in motor and pump modes. A defeat option is available to disable the pressure compensator override when the motor is running in pump mode.
The pressure compensator option features a low pressure rise (short ramp) to ensure optimal power utilization throughout the entire displacement range of the motor. The pressure compensator is also available as a stand-alone regulator.
•The series 51 and 51-1 motors – Advanced technology
•The most technically advanced hydraulic units in the industry
•SAE, cartridge, and DIN flange motors
•Cartridge motors designed for direct installation in compact planetary drives
•Large displacement ratio (5:1)
•Complete family of control systems
•Proven reliability and performance
•Optimum product configurations
•Compact, lightweight
6 | © Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 |
Technical Information
Series 51 and 51-1 Bent Axis Variable Displ. Motors
Series 51 general information
Series 51 with electric proportional control
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P001196 |
Legend:
1 – Piston
2 – Flange
3 – Servo piston
4 – Electric proportional control
5 – Synchronizing shaft
6 – Speed sensor
7 – Charge pressure relief valve
8 – Minimum displacement limiter
9 – Valve segment
10 – Bearing plate
11 – Speed pickup ring
12 – Tapered roller bearings
© Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 | 7 |
Technical Information
Series 51 and 51-1 Bent Axis Variable Displ. Motors
Series 51 general information
Series 51 with electrohydraulic two-position control
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P001831 |
Legend:
1 – Piston
2 – Flange
3 – Servo piston
4 – Electrohydraulic two-position control
5 – Synchronizing shaft
6 – Speed sensor
7 – Charge pressure relief valve
8 – Minimum displacement limiter
9 – Valve segment
10 – Bearing plate
11 – Speed pickup ring
12 – Tapered roller bearings
8 | © Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 |
Technical Information
Series 51 and 51-1 Bent Axis Variable Displ. Motors
Series 51 general information
Control handle
Reversible variable displacement pump
Input shaft
Pump swashplate
Displacement control valve
Orificed check valve
Servo control cylinder
Servo |
cylinder |
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Bent axis variable |
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displacement motor |
case |
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Servo |
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pressure |
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relief |
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valves |
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Output shaft |
to motor |
Synchronizing shaft |
case |
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Loop flushing relief valve
Working loop |
Working loop |
Suction |
Servo pressure |
Case drain fluid |
P001 175E |
(High pressure) |
(Low pressure) |
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M3 |
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M1 |
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M4 |
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M5 |
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M |
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M2 |
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B |
S |
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L2 |
A |
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M4 |
M3 |
N |
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M1 |
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max. |
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disp. |
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T2 |
T3 |
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T1 |
T7 |
T8 |
M5 |
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M2 |
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L1 |
X1 |
M7 |
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Signal pressure supply
P001833E
Above schematic shows the function of a hydrostatic transmission using a Series 90 Axial Piston Variable Displacement Pump with manual displacement control (MA) and a Series 51 Bent Axis Variable Displacement Motor with hydraulic two-position control (HZ).
© Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 | 9 |
Technical Information
Series 51 and 51-1 Bent Axis Variable Displ. Motors
Series 51 general information
Series 51 name plate
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Neumünster/Germany |
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Ident |
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Model No./Ident. No. |
5084092 |
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Model Code |
51V080 RS1N |
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L1B1 WB31 ADA |
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Serial |
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051AAF0 D400 |
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Serial No. |
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N982211215 |
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serial number |
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Made in Germany |
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Place of manufacture |
P001 832E |
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508 4092 |
Series 51-1 name plate |
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Neumünster/Germany |
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Ident |
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Model No./Ident. No. |
511685 |
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Model |
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Model Code |
51D110-1-RD4N |
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E1B1 NNU2 ADD |
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Serial |
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030AAA3 0000 |
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Barcode |
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Serial No. |
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N973212355 |
number |
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Made in Germany |
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Place of manufacture |
P001 832E |
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511 685 |
10 | © Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 |
Technical Information
Series 51 and 51-1 Bent Axis Variable Displ. Motors
Most specifications for bent axis variable displacement motors are listed on these pages. For definitions of the various specifications, see the related pages in this publication. Not all hardware options are available for all configurations; consult the series 51 and 51-1 model code supplement or price book for more information.
General specifications
Design |
Axial piston motor with variable displacement, bent axis design |
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Direction of rotation |
Clockwise and counter-clockwise (bi-directional) |
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Recommended installation |
Discretionary, the housing must always be filled with hydraulic fluid |
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Other system requirements |
Independet braking system, circuit overpressure protection, suitable reservoir |
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Physical properties
Features |
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Unit |
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Size |
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060 |
080 |
110 |
160 |
250 |
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Maximum |
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60.0 [3.66] |
80.7 [4.92] |
109.9 |
160.9 |
250 [15.26] |
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Displacement |
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cm3 [in3] |
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[6.71] |
[9.82] |
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Minimum |
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12 [0.73] |
16.1 [0.98] |
22 [1.34] |
32.2 [1.96] |
50.0 [3.05] |
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Theor. flow at |
at rated speed |
l/min |
216 [57] |
250 [66] |
308 [81] |
402 [106] |
550 [145] |
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max. displ. |
at max. speed |
[US gal/min] |
264 [71] |
323 [85] |
396 [105] |
515 [136] |
675 [178] |
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Theor. corner power at rated |
kW |
252 |
300 |
371 |
480 |
638 |
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speed and max. working pressure |
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(Δp = 450 bar [6527 psi]) |
[hp] |
[338] |
[402] |
[498] |
[644] |
[856] |
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Theoretical |
at max. displ. |
N•m/bar |
0.95 |
1.28 |
1.75 |
2.56 |
3.98 |
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torque |
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[lbf•in/1000 psi] |
[583] |
[784] |
[1067] |
[1563] |
[2428] |
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at min. displ. |
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0.19 |
0.26 |
0.35 |
0.51 |
0.80 |
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[117] |
[156] |
[214] |
[313] |
[486] |
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Mass moment of inertia of |
kg•m2 |
0.0046 |
0.0071 |
0.0128 |
0.0234 |
0.0480 |
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rotating components |
[slug•ft2] |
[0.1092] |
[0.1685] |
[0.3037] |
[0.5553] |
[1.1580] |
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Rated speed |
at max. displ. |
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3600 |
3100 |
2800 |
2500 |
2200 |
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at min. displ. |
min-1(rpm) |
5600 |
5000 |
4500 |
4000 |
3400 |
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Maximum |
at max. displ. |
4400 |
4000 |
3600 |
3200 |
2700 |
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speed* |
at min. displ. |
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7000 |
6250 |
5600 |
5000 |
4250 |
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* Contact Danfoss representative for max. speed at displacements between max. and min. displacement.
© Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 | 11 |
Technical Information
Series 51 and 51-1 Bent Axis Variable Displ. Motors
Technical specifications
System and case pressure
Parameter |
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Unit |
All sizes |
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Maximum delta |
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480 [7000] |
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System pressure |
Maximum |
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510 [7400] |
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Minimum low |
bar [psi] |
10 [145] |
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Rated |
3 [44] |
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Case pressure |
Maximum (cold start) |
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5 [73] |
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Minimum (at rated speed) |
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0.3 [4.35] |
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Fluid specifications
Features |
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Unit |
All sizes |
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Minimum intermittent |
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7 [49] |
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mm2/s |
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Viscosity |
Recommended range |
12-80 [66-366] |
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[SUS] |
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Maximum intermittent |
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1600 [7416] |
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Minimum |
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-40 [-40] |
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°C |
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Temperature range1)2) |
Rated |
104 [220] |
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[°F] |
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Maximum intermittent |
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115 [240] |
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Required cleanliness per ISO 4406 |
- |
22/18/13 |
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Cleanliness and Filtration |
Efficiency (charge pressure filtration) |
β-ratio |
β15-20 = 75 (β10 ≥ 10) |
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Efficiency (suction / return line filtration) |
β35-45 = 75 (β10 ≥ 2) |
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Recommended inlet screen mesh size |
µm |
100 – 125 |
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1)At the hottest point, normally case drain port.
2)Minimum: cold start, short term t<3 min, p<50 bar, n<1000 rpm.
12 | © Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 |
Technical Information
Series 51 and 51-1 Bent Axis Variable Displ. Motors
Technical specifications
Based on SI units |
Based on US units |
Qe |
= |
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Vg • n |
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1000 • |
v |
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Me |
= |
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Vg • p • |
mh |
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20 • |
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Pe = |
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Me • n |
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= |
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Qe • p • t |
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9550 |
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600 |
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n = |
Qe • 1000 • v |
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Vg |
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Where: |
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Qe |
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Input flow (l/min) |
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Me |
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Output torque (N•m) |
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Pe |
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Output power (kW) |
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n |
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Speed (min-1) |
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Vg |
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Motor displacement per rev. (cm3/rev) |
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phigh |
High pressure (bar) |
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plow |
Low pressure (bar) |
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∆p |
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High pressure minus Low pressure (bar) |
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ηv |
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Motor volumetric efficiency |
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ηmh |
Mechanical-hydraulic efficiency |
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ηt |
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Motor total efficiency (ηv • ηmh) |
Qe |
= |
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Vg • n |
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231 • |
v |
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Me |
= |
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Vg • |
p • |
mh |
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2 • |
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Pe = |
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Vg • n • p • t |
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396 000 |
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n = |
Qe • 231 • |
v |
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Vg |
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Where: |
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Qe |
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Input flow [US gal/min] |
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Me |
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Output torque [lb•in] |
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Pe |
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Output power [hp] |
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n |
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Speed [rpm] |
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Vg |
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Motor displacement per rev. [in3/rev] |
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phigh |
High pressure [psi] |
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plow |
Low pressure [psi] |
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∆p |
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High pressure minus Low pressure [psi] |
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ηv |
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Motor volumetric efficiency |
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ηmh |
Mechanical-hydraulic efficiency |
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ηt |
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Motor total efficiency (ηv • ηmh) |
© Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 | 13 |
Technical Information
Series 51 and 51-1 Bent Axis Variable Displ. Motors
Under normal operating conditions, case pressure must not exceed the rated pressure. Momentary case pressure exceeding this rating is acceptable under cold start conditions, but still must stay below the maximum pressure rating.
The minimum pressure provides proper lubrication at high speeds.
Operation with case pressure in excess of these limits may result in external leakage due to damage to seals, gaskets, and/or housings.
Case pressure
Parameter |
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Unit |
All sizes |
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Rated |
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3 [44] |
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Case pressure |
Maximum (cold start) |
bar [psi] |
5 [73] |
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Minimum (at rated speed) |
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0.3 [4.35] |
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Rated speed is the speed limit recommended at full power condition and is the highest value at which normal life can be expected.
Maximum speed is the highest operating speed permitted and cannot be exceeded without reduction in the life of the product or risking immediate failure and loss of driveline power (which may create a safety hazard). In the range between rated and maximum speed please contact your Danfoss Power Solutions representative.
W Warning
The loss of hydrostatic drive line power in any mode of operation (e.g., forward, reverse, or “neutral”) may cause the loss of hydrostatic braking capacity. A braking system, redundant to the hydrostatic transmission must, therefore, be provided which is adequate to stop and hold the system should the condition develop.
Speed limits
Features |
Unit |
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Size |
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060 |
080 |
110 |
160 |
250 |
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Rated speed |
at max. displ. |
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3600 |
3100 |
2800 |
2500 |
2200 |
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at min. displ. |
min-1(rpm) |
5600 |
5000 |
4500 |
4000 |
3400 |
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Maximum speed |
at max. displ. |
4400 |
4000 |
3600 |
3200 |
2700 |
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at min. displ. |
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7000 |
6250 |
5600 |
5000 |
4250 |
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14 | © Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 |
Technical Information
Series 51 and 51-1 Bent Axis Variable Displ. Motors
General technical specifications
Speed limits
Maximim speed
at min. displacement
Rated speed at min. displacement
<![endif]>Speed min-1 (rpm)
Curve determined by rated flow
Maximum speed
at max. displacement
Acceptable operating range
Rated speed
at max. displacement
Min. displacement |
Max. displacement |
Motor angle (degrees) |
P001 781E |
For operation within the range above the acceptable range contact Danfoss Power Solutions representative.
System pressure is the dominant operating variable affecting hydraulic unit life. High pressure, which results from high load, reduces expected life in a manner similar to the affects of high load on other mechanical assemblies such as engines and gear boxes. There are load-to-life relationships for the rotating group and for the shaft anti-friction bearings.
Continuous pressure is the pressure at which the hydrostatic system could operate continuously and still achieve acceptable hydrostatic life. This pressure level varies depending on operating speed, and on the life requirements for a particular application. While most mobile applications require system pressure to vary widely during operation, a “weighted average” pressure can be derived from a machine duty cycle.
(A duty cycle is a means of quantifying the pressure and speed demands of a particular system on a percent time basis). Once a duty cycle has been determined or estimated for a specific application, contact your Danfoss representative for system life ratings for the application.
Maximum delta pressure is the highest intermittent pressure allowed, and is the relief valve setting. It is determined by the maximum machine load demand. For most systems, the load should move at this pressure.
Maximum pressure is assumed to occur a small percentage of operating time, usually less than 2 % of the total. Both the continuous and maximum pressure limits must be satisfied to achieve the expected life.
Minimum low pressure must maintained under all operating conditions to avoid cavitation.
System pressure range, input
Maximum delta pressure |
Minimum low pressure |
Maximum pressure |
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480 [7000 psi] |
10 [145 psi] |
510 [7400 psi] |
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|
© Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 | 15 |
Technical Information
Series 51 and 51-1 Bent Axis Variable Displ. Motors
General technical specifications
An integral non-adjustable loop flushing valve is incorporated into all these motors. Installations that require fluid to be removed from the low pressure side of the system circuit because of cooling requirements or contamination removal will benefit from loop flushing.
The integral loop flushing valve is equipped with an orificed charge pressure relief valve designed with a cracking pressure of 16 bar [232 psi].
Valves are available with several orifice sizes to meet the flushing flow requirements of all system operating conditions.
The total system charge pump flow should be of sufficient volume to accommodate:
•The number of motors in the system
•System efficiency under worst case conditions
•Pump control requirements
•External needs
Although charge pump sizing requires the consideration of many system variables, the following table gives a recommendation of what charge pump displacement may be required to accommodate the flushing flow of each available charge relief valve orifice.
Recommended charge pump displacement
Loop flushing valve |
E4, E6 |
F0 |
F3 |
G0 |
G3 |
H0 |
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Charge pump size (cm3) |
8 |
11 |
14 |
17 or 20 |
26 |
34, 47 or 65 |
W Warning
The loss of hydrostatic drive line power in any mode of operation (e.g., forward, reverse, or “neutral” mode) may cause the loss of hydrostatic braking capacity. A braking system, redundant to the hydrostatic transmission must, therefore, be provided which is adequate to stop and hold the system should the condition develop.
Loop flushing valve
Loop flushing shuttle spool
Loop flushing relief valve |
P001 782E |
Hydraulic schematic
A B
P001 830
16 | © Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 |
Technical Information
Series 51 and 51-1 Bent Axis Variable Displ. Motors
General technical specifications
Case flow characteristic
<![if ! IE]> <![endif]>pressure |
[508] |
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E4 E6 F0 |
F3 |
G0 G3 |
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H0 |
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35 |
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<![if ! IE]> <![endif]>case |
[363] |
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<![if ! IE]> <![endif]>pressure minus bar [psi] |
25 |
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[218] |
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15 |
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[73] |
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5 |
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<![if ! IE]> <![endif]>system |
0 |
5 |
10 |
15 |
20 |
25 |
30 |
35 |
40 |
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[1.3] |
[2.6] |
[4.0] |
[5.3] |
[6.6] |
[8.0] |
[9.2] [10.6] |
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<![if ! IE]> <![endif]>Low |
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Case flow l/min [US gal/min] |
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P001 860E |
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Equation:
Where:
QFlush – flushing flow per motor
QCharge – charge flow at operating speed
kMo – number of motors feeded by one pump QLeak – sum of external leakages
QLeak includes:
•motor leakage
•pump leakage + internal consumers:
‒8 l/min [2.11 US gal/min] for displacement control pumps or
‒for non-feedback controlled pumps at 200 bar [2900 psi]
•external consumers:
‒e.g. brakes, cylinders, and other pumps
All Series 51 and 51-1 motors incorporate mechanical displacement limiters.
The minimum displacement of the motor is preset at the factory with a set screw in the motor housing. A tamper-proof cap is provided.
Ratings and data are based on operating with hydraulic fluids containing oxidation, rust and foam inhibitors. These fluids must possess good thermal and hydrolytic stability to prevent wear, erosion and corrosion of the internal components.
Fire resistant fluids are also suitable at modified operating conditions. Please see Danfoss literature Technical Information Hydraulic Fluids and Lubricants for more information.
For more information contact your Danfoss representative.
C Caution
It is not permissible to mix hydraulic fluids.
Suitable hydraulic fluids:
© Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 | 17 |
Technical Information
Series 51 and 51-1 Bent Axis Variable Displ. Motors
General technical specifications
•Hydraulic fluids per DIN 51 524, part 2 (HLP)
•Hydraulic fluids per DIN 51 524, part 3 (HVLP)
•API CD, CE and CF engine fluids per SAE J183
•M2C33F or G automatic transmission fluids (ATF)
•Agricultural multi purpose oil (STOU)
•Premium turbine oils (for Premium turbine oils contact your Danfoss representative).
Temperature and viscosity requirements must be concurrently satisfied. The data shown in the tables assume petroleum-based fluids, are used.
The high temperature limits apply at the hottest point in the transmission, which is normally the motor case drain. The system should generally be run at or below the rated temperature. The maximum temperature is based on material properties and should never be exceeded.
Cold oil will generally not affect the durability of the transmission components, but it may affect the ability to flow oil and transmit power; therefore temperatures should remain 16 °C [30 °F] above the pour point of the hydraulic fluid. The minimum temperature relates to the physical properties of component materials.
For maximum unit efficiency and bearing life the fluid viscosity should remain in the recommended operating range. The minimum viscosity should be encountered only during brief occasions of maximum ambient temperature and severe duty cycle operation. The maximum viscosity should be encountered only at cold start.
Heat exchangers should be sized to keep the fluid within these limits. Testing to verify that these temperature limits are not exceeded is recommended.
Viscosity and temperature range
Features |
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Unit |
All sizes |
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Minimum intermittent |
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7 [49] |
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mm2/s |
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Viscosity |
Recommended range |
12-80 [66-366] |
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[SUS] |
||||
|
|
|
||
|
Maximum intermittent |
|
1600 [7416] |
|
|
|
|
|
|
|
Minimum |
|
-40 [-40] |
|
|
|
°C |
|
|
Temperature range1)2) |
Rated |
104 [220] |
||
[°F] |
||||
|
Maximum intermittent |
|
115 [240] |
|
|
|
|
|
1)At the hottest point, normally case drain port.
2)Minimum: cold start, short term t<3 min, p<50 bar, n<1000 rpm.
To prevent premature wear, ensure that only clean fluid enters the hydrostatic transmission circuit. A filter capable of controlling the fluid cleanliness to ISO 4406, class 22/18/13 (SAE J1165) or better, under normal operating conditions, is recommended.These cleanliness levels cannot be applied for hydraulic fluid residing in the component housing/case or any other cavity upon delivery from the factory.
The filter may be located on the pump (integral) or in another location (remote or suction). The integral filter has a filter bypass sensor to signal the machine operator when the filter requires changing. Filtration strategies include suction or pressure filtration. The selection of the filter strategy depends on a number of factors including the contaminant ingression rate, the generation of contaminants in the system, the required fluid cleanliness, and the desired maintenance interval. Filters are selected to meet the above requirements using rating parameters of efficiency and capacity.
Filter efficiency can be measured with a Beta ratio (βX). For simple suction-filtered closed circuit transmissions and open circuit transmissions with return line filtration, a filter with a β-ratio within the
18 | © Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 |
Technical Information
Series 51 and 51-1 Bent Axis Variable Displ. Motors
General technical specifications
range of β35-45 = 75 (β10 ≥ 2) or better has been found to be satisfactory. For some open circuit systems, and closed circuits with cylinders being supplied from the same reservoir, a higher filter efficiency is recommended. This also applies to systems with gears or clutches using a common reservoir. For these systems, a charge pressure or return filtration system with a filter β-ratio in the range of β15-20 = 75 (β10 ≥ 10) or better is typically required.
Because each system is unique, only a thorough testing and evaluation program can fully validate the filtration system. For more information, see Design Guidelines for Hydraulic Fluid Cleanliness, Technical Information BC00000095.
Filter βx-ratio is a measure of filter efficiency defined by ISO 4572. It is defined as the ratio of the number of particles greater than a given diameter (“x” in microns) upstream of the filter to the number of these particles downstream of the filter.
Filtration, cleanliness level and βx-ratio (recommended minimum)
Cleanliness per ISO 4406 |
22/18/13 |
|
|
|
|
Efficiency βx (charge pressure filtration) |
β15-20 = 75 (β10 |
≥ 10) |
Efficiency βx (suction and return line filtration) |
β35-45 = 75 (β10 |
≥ 2) |
Recommended inlet screen mesh size |
100 – 125 µm |
|
|
|
|
Ratings and performance data are based on operating with hydraulic fluids containing oxidation, rust and foam inhibitors. These fluids must possess good thermal and hydrolytic stability to prevent wear, erosion, and corrosion of motor components.
C Caution
Never mix hydraulic fluids of different types.
Fire resistant fluids are also suitable at modified operating conditions. For more information, see
Hydraulic Fluids and Lubricants, Technical Information BC00000093.
The function of the reservoir is to remove air and to provide make up fluid for volume changes associated with fluid expansion or contraction, possible cylinder flow, and minor leakage.
The reservoir should be designed to accommodate maximum volume changes during all system operating modes and to promote deaeration of the fluid as it passes through the tank.
A minimum reservoir volume equal to 1/2 to 1 1/2 times charge pump flow/min is suggested. This allows 30 seconds fluid dwell for removing entrained air at the maximum return flow. This is usually adequate to allow for a closed reservoir (no breather) in most applications. The reservoir outlet to the charge pump inlet should be above the bottom of the reservoir to take advantage of gravity separation and prevent large foreign particles from entering the charge inlet line.
The reservoir inlet (fluid return) should be positioned so that the flow to the reservoir is discharged below the normal fluid level, and also directed into the interior of the reservoir for maximum dwell and efficient deaeration.
W Warning
The loss of hydrostatic drive line power in any mode of operation (e.g., forward, reverse, or “neutral” mode) may cause the loss of hydrostatic braking capacity. A braking system, redundant to the hydrostatic transmission must, therefore, be provided which is adequate to stop and hold the system should the condition develop.
© Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 | 19 |
Technical Information
Series 51 and 51-1 Bent Axis Variable Displ. Motors
General technical specifications
The rated motor bearing life Lh10 shown in the table below is based on a 90 % survival rate of shaft bearings, when operating at a speed of n = 1500 min-1 (rpm) with a charge pressure of 20 bar [290 psi] and without external shaft load.
The rated motor bearing life Lh10 (hours)
Frame Size |
Effective ∆ pressure |
|
Motor angle |
|
|
bar [psi] |
6° |
15° |
32° |
|
|
|||
|
|
|
|
|
|
140 [2030] |
19 800 |
18 530 |
16 370 |
060 |
|
|
|
|
210 [3050] |
6320 |
5960 |
5340 |
|
|
|
|
|
|
|
280 [4060] |
2740 |
2600 |
2350 |
|
|
|
|
|
|
140 [2030] |
14 420 |
13 580 |
12 120 |
080 |
|
|
|
|
210 [3050] |
4610 |
4370 |
3960 |
|
|
|
|
|
|
|
280 [4060] |
2000 |
1910 |
1750 |
|
|
|
|
|
|
140 [2030] |
15 800 |
14 890 |
13 330 |
110 |
|
|
|
|
210 [3050] |
5040 |
4790 |
4350 |
|
|
|
|
|
|
|
280 [4060] |
2180 |
2090 |
1920 |
|
|
|
|
|
|
140 [2030] |
15 670 |
14 770 |
13 200 |
160 |
|
|
|
|
210 [3050] |
5005 |
4750 |
4300 |
|
|
|
|
|
|
|
280 [4060] |
2170 |
2070 |
1900 |
|
|
|
|
|
|
140 [2030] |
11 760 |
11 130 |
10 020 |
250 |
|
|
|
|
210 [3050] |
3750 |
3580 |
3260 |
|
|
|
|
|
|
|
280 [4060] |
1630 |
1560 |
1440 |
|
|
|
|
|
Lifetimes for speeds other than 1500 min-1 (rpm) can be calculated from:
L2 = |
L1 • 1500 |
hours |
|
n2 |
|||
|
|
||
Where: |
|
||
L1 |
= Rated L10 life at 1500 min-1 (rpm) |
||
n2 |
= Operating speed |
Units:
hours min-1 (rpm)
Contact your Danfoss Power Solutions representative for bearing life values at other pressure and angle.
20 | © Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 |
Technical Information
Series 51 and 51-1 Bent Axis Variable Displ. Motors
General technical specifications
Series 51 and 51-1 motors are designed with bearings that can accept external radial and thrust loads.
The external radial shaft load limits are a function of the load position, the load orientation, and operating conditions of the unit.
SAE-Flange design per ISO 3019/1 |
|
Fr OPTIMUM LOAD |
||||
|
|
|
|
|
||
X2 > X1 |
X2 < X1 |
|
ORIENTATION |
|||
|
||||||
35° |
||||||
|
|
|
35° |
|||
|
|
|
|
|
X1 |
A |
Fr |
Fa
DIN-Flange design per ISO 3019/2
X2 > X1 |
X2 < X1 |
X1
A
Fr
Fa
35°
Fr OPTIMUM LOAD
ORIENTATION
35°
Cartridge Flange design |
|
Fr OPTIMUM LOAD |
|
||
|
|
|
|
|
ORIENTATION |
|
|
X2 > X1 |
X2 < X1 |
35° |
35° |
|
|||
|
X1 |
|
|
|
A |
|
|
|
Fr |
|
|
Fa |
|
|
|
P001 166E
© Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 | 21 |
Technical Information
Series 51 and 51-1 Bent Axis Variable Displ. Motors
General technical specifications
The table below provides the following information:
•The maximum allowable radial load (Fr) based on the distance (X1) from the mounting flange to the load.
•The maximum allowable axial load (Fa).
•The actual distance of Fr for a given application from the mounting flange to the load (X2).
•The basic distance (A).
•Fa/∆p ratio of allowable axial load, dependent upon the system pressure.
Radial and thrust loads to the output shaft
Feature |
Symbol |
Unit |
|
|
Frame Size |
|
|
||
|
|
|
|
|
|
|
|
|
|
|
|
|
060 |
080 |
|
110 |
|
160 |
250 |
|
|
|
|
|
|
|
|
|
|
Maximum allowable radial load |
Fr |
|
10 000 |
12 000 |
|
14 000 |
|
18 000 |
26 000 |
|
|
N [lb] |
[2248] |
[2698] |
|
[3147] |
|
[4047] |
[5845] |
|
|
|
|
|
|
|
|
|
|
Max. allow. axial load at zero rpm, or |
Fa |
1100 |
1400 |
|
1800 |
|
2500 |
4500 |
|
|
|
|
|||||||
running in the idle pressure |
|
|
[247] |
[315] |
|
[405] |
|
[562] |
[1012] |
|
|
|
|
|
|
|
|
|
|
Max. allowable bending moment |
M |
N•m |
252 |
307 |
|
766 |
|
805 |
970 |
|
|
[lb•in] |
[2230] |
[2717] |
|
[6780] |
|
[7125] |
[8585] |
|
|
|
|
|
|
|
|
|
|
Max. allowable axial load at pressure |
Fa/∆p |
N/bar |
10.4 |
12.6 |
|
15.2 |
|
19.2 |
26.4 |
|
|
[lb/1000 psi] |
[161] |
[195] |
|
[236] |
|
[298] |
[409] |
|
|
|
|
|
|
|
|
|
|
Distance SAE mounting flange |
|
|
33.6 |
33.6 |
|
62.7 |
|
52.7 |
45.3 |
|
|
|
[1.32] |
[1.32] |
|
[2.47] |
|
[2.07] |
[1.78] |
|
|
|
|
|
|
|
|
|
|
Distance DIN mounting flange |
X1 |
|
57.2 |
57.6 |
|
94.7 |
|
84.7 |
– |
|
mm [in] |
[2.25] |
[2.27] |
|
[3.73] |
|
[3.33] |
||
|
|
|
|
|
|
|
|
|
|
Distance Cartridge mount. flange |
|
117.6 |
136.1 |
|
177.5 |
|
– |
– |
|
|
|
|
|
||||||
|
|
|
[4.63] |
[5.36] |
|
[7.0] |
|
||
|
|
|
|
|
|
|
|||
|
|
|
|
|
|
|
|
|
|
Basic distance |
A |
|
25.2 |
25.6 |
|
54.7 |
|
44.7 |
37.3 |
|
|
|
[0.99] |
[1.01] |
|
[2.15] |
|
[1.76] |
[1.47] |
|
|
|
|
|
|
|
|
|
|
– = not available
The values in the table are maximum values and are not allowed under continuous load conditions.
Use this formula to calculate maximum allowable radial load when max. shaft load distance X2 is different from X1:
Metric system: |
Inch system: |
|
|
|
|
Metric or Inch system:
X2 > X1 Fr = Fr max N [lbf]
X2 is the actual distance of Fr from the mounting flange to the load for a given application. If X2< X1, Fr could also be calculated by the first equation, but in addition the bearing life has to be checked.
Contact your Danfoss representative for load ratings of specific shafts or when the load orientation deviates more than 35° in either direction from the optimum.
22 | © Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 |
Technical Information
Series 51 and 51-1 Bent Axis Variable Displ. Motors
General technical specifications
This graph provides the volumetric and overall efficiencies for a typical Series 51 and 51-1 motor operating at maximum displacement, system pressures of 210 and 420 bar [3050 and 6090 psi], and a fluid viscosity of 8.2 mm²/s [53 SUS]. These efficiencies can be used for all frame sizes.
Overall and volumetric efficiency at maximum displacement
|
100 |
|
|
|
|
|
95 |
|
<![if ! IE]> <![endif]>% |
|
|
<![if ! IE]> <![endif]>Efficiency |
90 |
|
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|
85 |
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|
80 |
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0 |
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|||||||||||
|
volum |
e |
tric efficiency η |
v |
= 210 bar [3050 psi] |
|
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||||||||||||||||||
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= |
|
20 |
bar |
[6090 psi] |
||||||||
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η |
v |
4 |
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] |
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to |
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p |
si |
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l |
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0 |
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η |
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e |
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9 |
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ff |
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0 |
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= |
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ic |
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6 |
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ie |
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t |
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2 |
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n |
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[ |
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r |
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1 |
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c |
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y |
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a |
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b |
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b |
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r |
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[3 |
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s |
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i |
ηt |
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25 |
50 |
75 |
100 |
|
Speed % of rated speed |
|
P001 155E |
This graph shows typical overall efficiencies for Series 51 and 51-1 motors operating at maximum displacement and system pressures up to 420 bar [6090 psi], and a fluid viscosity of 8.2 mm²/s [53 SUS]. These efficiencies can be used for all frame sizes.
Overall efficiency at maximum displacement
<![endif]>System pressure bar [psi]
420 |
|
|
|
|
|
|
[6090] |
|
|
|
|
|
|
280 |
|
|
|
94.5% |
|
|
[4060] |
|
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||
|
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||
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93.5% |
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140 |
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[2030] |
|
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90.5% |
|
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84.5% |
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0 |
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|
74.5% |
|
|
0 |
25 |
50 |
75 |
100 |
||
|
Speed% of rated speed
P001 137E
This graph shows typical overall efficiencies for Series 51 and 51-1 motors operating at 30% of maximum displacement and system pressures up to 420 bar [6090 psi], and a fluid viscosity of 8.2 mm²/s (53 SUS). These efficiencies can be used for all frame sizes.
© Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 | 23 |
Technical Information
Series 51 and 51-1 Bent Axis Variable Displ. Motors
General technical specifications
Overall and volumetric efficiency at 30% of maximum displacement
100
95
90
|
|
|
|
|
|
|
|
|
|
|
|
volumetric efficiency ηv |
= 210 bar [3050 psi] |
||||
|
|
||||
|
|
|
|
|
|
|
η |
v |
= |
4 |
20 bar [6090 psi] |
|
|
|
|
|
<![endif]>Efficiency %
85
80
75
70
65
60
|
|
overall efficiency |
η |
|
= 210 b |
|
|
|
||
|
|
|
|
|
t |
|
ar [3 |
|
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|
050 psi] |
|||
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|||
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η |
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= |
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4 |
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t |
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20ba |
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r[ |
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60 |
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90 |
p |
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si] |
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0 |
25 |
50 |
75 |
100 |
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Speed % of rated speed |
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P001 156E |
This graph shows typical overall efficiencies for Series 51 and 51-1 motors operating at 30% of maximum displacement and system pressures up to 420 bar [6090 psi], and a fluid viscosity of 8.2 mm²/s (53 SUS). These efficiencies can be used for all frame sizes.
Overall efficiency at 30% of maximum displacement
<![endif]>System pressure bar [psi]
420 |
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[6090] |
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280 |
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[4060] |
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81% |
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80% |
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140 |
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77% |
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[2030] |
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71% |
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61% |
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0 |
25 |
50 |
75 |
100 |
0 |
Speed % of rated speed |
P001 138E |
|
24 | © Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 |
Technical Information
Series 51 and 51-1 Bent Axis Variable Displ. Motors
General technical specifications
An optional speed sensor for direct measurement of speed is available. This sensor may also be used to sense the direction of rotation. A special magnetic speed pick-up ring is pressed onto the outside diameter of the shaft and a Hall effect sensor is located in the motor housing. The sensor accepts supply voltage and outputs a digital pulse signal in response to the speed of the ring. The output changes its high/low state as the north and south poles of the permanently magnetized speed ring pass by the face of the sensor. The digital signal is generated at frequencies suitable for microprocessor based controls. The sensor is available with different connectors (see below). The SAE and DIN flange motors use a flat end speed sensor. The cartridge flange motors use a conical end speed sensor.
Data magnetic speed pick-up ring
Frame size |
060 |
080 |
110 |
160 |
250 |
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Pulze/Rev |
45 |
49 |
54 |
61 |
71 |
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Speed sensor technical data
Supply voltage1) |
4.5 – 8.5 VDC |
Supply voltage regulated |
15 VDC max. |
Required current |
12 mA at 5 VDC (no load) |
Maximum current |
20 mA at 5 VDC and 1 Hz |
Maximum frequency |
15 kHz |
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Voltage "high" |
Supply voltage -0.5 VDC min. |
Voltage "low" |
0.5 VDC max. |
Temperature range |
-40 to 110 °C [-40 to 230 °F] |
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1) It is not acceptable to energize the 4.5-8.5 VDC speed sensor with 12 VDC battery voltage; it must be energized by a regulated power supply. If it is desirable to energize the sensor with battery voltage, contact your Danfoss representative for an optional speed sensor.
Speed sensor with Turck Eurofast 4-pin connector
P001 492
Pin 1 or A: Supply voltage
Pin 2 or B: Direction of rotation
Pin 3 or C: Speed signal, digital
Pin 4 or D: Ground common
Turck Eurofast Connector |
Keyway (Ref) |
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4 pin |
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2 |
1 |
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(Supplied connector) |
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IP Rating (DIN 40 050) IP 67 |
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Mating connector |
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straight |
right angle |
3 |
4 |
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No.: K14956 |
No.: K14957 |
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Id.-No.: 500724 |
Id.-No.: 500725 |
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P001 755E |
Speed sensor with Packard Weather-Pack 4-pin connector
Red
P002 108E
© Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 | 25 |
Technical Information
Series 51 and 51-1 Bent Axis Variable Displ. Motors
General technical specifications
Packard Weather-Pack
4 pin A
(Supplied Connector) B
Mating Connector |
C |
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D |
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No.: K03379 |
P001 758E |
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Id.-No.: 505341 |
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Contact your Danfoss representative for more information.
Application |
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Control / Regulators |
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without PCOR |
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with PCOR |
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with PCOR and BPD |
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N1 |
HZ |
E1, E2, E7 |
EP, EQ |
F1, F2 |
L1, L2, L7 |
TA |
T1, T2 |
TH |
HS |
TA |
T1, T2 |
EP, EQ |
D7, D8 |
HS |
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Wheel loader1) |
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Roller compactor1)
Paver wheeled1)
Paver tracked1)
Sweeper1)
Trencher1)
Excavator wheeled1)
Fork lift truck1)
Agricultural1)
Forestry1)
Telehandler1)
Railroad1)
Snow groomer1)
Snow blower2)
Crane3)
Suitable configuration
1)Propel function
2)Blow drive function
3)Winch function
The table above is provided to assist in selecting controls and regulators for various applications. These recommendations are based on experience with a wide range of applications.
Contact your Danfoss Power Solutions representative for more information on control selection.
26 | © Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 |
Technical Information
Series 51 and 51-1 Bent Axis Variable Displ. Motors
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L2 |
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N |
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A |
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n |
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min. |
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disp. |
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T3 |
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T2 |
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X1 |
M5 |
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B |
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(M3) |
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L1 |
M4 |
P001 779E |
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A, B = Main pressure lines
L1, L2 = Drain lines
M4 = Gauge port servo pressure
M5 = Gauge port servo supply pressure
X1 (M3) = Control pressure
T1, T2, T3 = Optional orifices
N = Speed sensor
Displacement changes from maximum displacement to minimum displacement position, under load, as control pressure at port X1 (M3) is equal to low pressure or higher.
Control pressure on port X1 (M3)
No pressure on port = maximum displacement Control pressure on port = minimum displacement Maximum control pressure = 50 bar [725 psi]
The graph shows the necessary external and internal (= low system pressure) control pressure X1, which is needed to stroke the motor depending on high system pressure.
Control N1NN necessary control pressure
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30 |
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<![if ! IE]> <![endif]>[psi] |
[435] |
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<![if ! IE]> <![endif]>bar |
20 |
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[290] |
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<![if ! IE]> <![endif]>pressure |
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10 |
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minimum servo pressure |
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<![if ! IE]> <![endif]>Servo |
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[145] |
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under all conditions |
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00 |
100 |
200 |
300 |
400 |
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[1450] |
[2900] |
[4350] |
[5800] |
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System pressure bar [psi] |
P001 877E |
||
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|
© Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 | 27 |
Technical Information
Series 51 and 51-1 Bent Axis Variable Displ. Motors
Controls circuit diagram – nomenclature – description
Control operation N1NN
<![if ! IE]><![endif]>Control pressure
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min |
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max |
Displacement
P001 875E
Not all control options are shown in this Technical Information.
Contact your Danfoss representative for special control functions.
L2 |
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M4 |
M3 |
N |
A |
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M1 |
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n |
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max. |
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disp. |
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T3 |
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T2 |
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T1 |
T7 |
T8 |
M5 |
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B |
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M2 |
L1 |
X1 |
M7 |
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P100 177E |
A, B = Main pressure lines
L1, L2 = Drain lines
M1, M2 = Gauge port for A and B
M3, M4 = Servo pressure
M5 = Gauge port servo supply pressure internal
M7 = Gauge port control pressure
X1 = Control pressure
T1, T2, T3, T7, T8 = Optional orifices
N = Speed sensor
Displacement can be changed hydraulically under load from minimum displacement to maximum displacement and vice versa by control pressure to port X1. For proportional control see Option HZB1 – hydraulic proportional control for 51 (all frame sizes) on page 62
Control pressure on port X1
28 | © Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 |
Technical Information
Series 51 and 51-1 Bent Axis Variable Displ. Motors
Controls circuit diagram – nomenclature – description
No pressure on port = maximum displacement
Control pressure on port = minimum displacement
Maximum control pressure = 50 bar [725 psi]
The standard control start point setting = 3 bar [44 psi]
Control operation HZB1
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<![if ! IE]> <![endif]>bar [psi] |
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<![if ! IE]> <![endif]>3 [44] |
<![if ! IE]> <![endif]>pressure |
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<![if ! IE]> <![endif]>0 |
<![if ! IE]> <![endif]>Control |
min |
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Displacement |
max |
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P100 179E
Not all control options are shown in this Technical Information.
Contact your Danfoss representative for special control functions.
© Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 | 29 |
Technical Information
Series 51 and 51-1 Bent Axis Variable Displ. Motors
Controls circuit diagram – nomenclature – description
Circuit diagram–motor with pressure compensator control TA**
T3 |
M3 with Electric brake pressure defeat
XB XA
T3 |
M3 with Hydraulic brake pressure defeat
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A |
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T3 |
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M3 |
B |
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without |
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Brake pressure |
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defeat |
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L2 |
N |
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n |
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min. |
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disp. |
L1 |
M4 |
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P001 834E |
Ports:
A, B = Main pressure lines
L1, L2 = Drain lines
M3, M4 = Servo pressure
XA, XB = Control pressure port brake pressure defeat (BPD)
T3 = Orifice
N = Speed sensor
Displacement is regulated automatically between minimum and maximum displacement in response to system pressure.
Regulator start = minimum displacement Regulator end = maximum displacement
Regulator start pressure is adjustable from 130 to 370 bar [1890 to 5370 psi].
Pressure ramp from regulator start pressure (with motor at minimum displacement) until maximum displacement is reached is less than 10 bar [145 psi]. This ensures optimal power utilization throughout the entire displacement range of the motor.
Control operation TA**
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<![if ! IE]> <![endif]>Regulator start |
<![if ! IE]> <![endif]>Setting range |
<![if ! IE]> <![endif]>370 |
<![if ! IE]> <![endif]>[5370] |
<![if ! IE]> <![endif]>p bar [psi] |
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<![if ! IE]> <![endif]>130 |
<![if ! IE]> <![endif]>[1890] |
<![if ! IE]> <![endif]>pressure |
min |
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max <10bar[145psi] |
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<![if ! IE]> <![endif]>System |
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Displacement |
<![if ! IE]> <![endif]>Ramp |
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P001 173E |
30 | © Danfoss | October 2017 |
520L0440 | BC00000018en-US0401 |