General description
Overview..............................................................................................................................................................................................6
Features................................................................................................................................................................................................6
System diagram................................................................................................................................................................................ 7
Schematic............................................................................................................................................................................................8
Technical specifications
Design specifications...................................................................................................................................................................... 9
Technical data....................................................................................................................................................................................9
Operating parameters..................................................................................................................................................................10
Fluid specifications........................................................................................................................................................................10
Operation
High Pressure Relief Valve (HPRV) and charge checkHPRV and charge check........................................................11
Bypass function...............................................................................................................................................................................11
Charge Pressure Relief Valve (CPRV)CPRV function...........................................................................................................12
Loop flushing valve.......................................................................................................................................................................13
Electrical displacement control (EDC).................................................................................................................................... 13
EDC principle..............................................................................................................................................................................13
EDC operation............................................................................................................................................................................14
Control signal requirements, EDC MP1............................................................................................................................ 15
EDC solenoid data.................................................................................................................................................................... 15
Control response.......................................................................................................................................................................16
EDC response time..............................................................................................................................................................16
Manual override (MOR)...........................................................................................................................................................16
Hydraulic displacement control (HDC).................................................................................................................................. 17
HDC principle.............................................................................................................................................................................17
HDC operation...........................................................................................................................................................................17
Hydraulic signal pressure range..........................................................................................................................................18
Pump output flow direction vs. control pressure.........................................................................................................18
Control response.......................................................................................................................................................................18
Response time, HDC................................................................................................................................................................ 19
Swashplate angle sensor for EDC controls........................................................................................................................... 20
Swash plate angle sensor parameters (EDC).................................................................................................................. 20
Swash plate angle sensor connector.................................................................................................................................21
Interface with ECU (EDC)........................................................................................................................................................21
Manual displacement control....................................................................................................................................................21
MDC principle............................................................................................................................................................................ 21
MDC operation.......................................................................................................................................................................... 23
MDC shaft rotation...................................................................................................................................................................23
Control response.......................................................................................................................................................................24
MDC response time............................................................................................................................................................24
Neutral start switch (NSS)...................................................................................................................................................... 24
Case gauge port M14.............................................................................................................................................................. 25
Lever..............................................................................................................................................................................................25
Forward-neutral-reverse (FNR) electic control....................................................................................................................26
FNR principle..............................................................................................................................................................................26
Control response.......................................................................................................................................................................28
Response time, FNR............................................................................................................................................................28
Non feedback proportional electric control (NFPE).......................................................................................................... 28
Control signal requirements.................................................................................................................................................29
Control response.......................................................................................................................................................................30
Response time......................................................................................................................................................................31
Non-feedback, proportional hydraulic (NFPH) control....................................................................................................31
Control response.......................................................................................................................................................................32
Response time......................................................................................................................................................................32
Automotive control (AC)............................................................................................................................................................. 33
Control-cut-off valve (CCO valve).............................................................................................................................................35
CCO solenoid data....................................................................................................................................................................36
Brake gauge port with MDC................................................................................................................................................. 37
Technical Information
MP1 Axial Piston Pumps Size 28/32, 38/45
Contents
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Danfoss | July 2022 BC178386485160en-000505 | 3