System diagram................................................................................................................................................................................ 7
Electrical displacement control (EDC).................................................................................................................................... 13
EDC principle..............................................................................................................................................................................13
EDC operation............................................................................................................................................................................14
Control signal requirements, EDC MP1............................................................................................................................ 14
EDC solenoid data.................................................................................................................................................................... 15
Control response.......................................................................................................................................................................15
EDC response time..............................................................................................................................................................15
Hydraulic displacement control (HDC).................................................................................................................................. 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
Interface with ECU (EDC)........................................................................................................................................................21
Control response.......................................................................................................................................................................24
Case gauge port M14.............................................................................................................................................................. 25
Control response.......................................................................................................................................................................28
Response time, FNR............................................................................................................................................................28
Non feedback proportional electric control (NFPE).......................................................................................................... 28
Control signal requirements.................................................................................................................................................29
Control response.......................................................................................................................................................................30
Control response.......................................................................................................................................................................32
Automotive control (AC)............................................................................................................................................................. 33
Brake gauge port with MDC................................................................................................................................................. 37
Temperature range..................................................................................................................................................................38
Speed sensor 4.5 – 8 V technical data...............................................................................................................................38
Temperature sensor data............................................................................................................................................................39
System pressure............................................................................................................................................................................. 40
Case pressure...................................................................................................................................................................................41
Filtration system ............................................................................................................................................................................43
Case drain......................................................................................................................................................................................... 45
Bearing life and external shaft loading.................................................................................................................................. 47
Hydraulic unit life...........................................................................................................................................................................49
Shaft torque and splines lubrication................................................................................................................................. 51
Shaft torque for tapered shafts............................................................................................................................................51
Shaft availability and torque ratings.......................................................................................................................................52
Understanding and minimizing system noise.....................................................................................................................52
Model code (A - B - C)................................................................................................................................................................... 55
Model code (D)................................................................................................................................................................................56
Model code (F)................................................................................................................................................................................ 57
Model code (H - J - T).................................................................................................................................................................... 58
Model code (K)................................................................................................................................................................................ 59
Model code (E - M - N - Z - L)...................................................................................................................................................... 60
Model code (V - G - W)..................................................................................................................................................................61
Model code (X - Y)..........................................................................................................................................................................63
28/32 dimensions with speed sensor.....................................................................................................................................68
38/45 dimensions with speed sensor.....................................................................................................................................72
Electric displacement control (EDC)........................................................................................................................................84
Electric displacement control with CCO (EDC+CCO)........................................................................................................85
EDC with ASNSR........................................................................................................................................................................86
Hydraulic displacement control (HDC).................................................................................................................................. 87
Manual displacement control (MDC)......................................................................................................................................88
MDC with NSS option M2...................................................................................................................................................... 89
MDC with CCO options M3, M4...........................................................................................................................................90
MDC with NSS and CCO options M5, M6......................................................................................................................... 91
Non-feedback proportional electric (NFPE)......................................................................................................................... 93
Automotive control (AC)............................................................................................................................................................. 95
AC connectors dimensions................................................................................................................................................... 96
Danfoss | February 2022BC178386485160en-000503 | 5
Technical Information
MP1 Axial Piston Pumps Size 28/32, 38/45
General description
MP1 overview
The MP1 pump is a variable displacement axial piston pump intended for closed circuit medium power
applications. The swashplate motion is controlled via compact hydraulic servo control system. A variety
of controls are available. These include mechanic or electric actuated feedback controls, electric or
hydraulic actuated non-feedback type controls, and a three-position electric control.. These controls
feature low hysteresis and responsive performance.
MP1 features
Designed for quality and reliability
•
Uniform design concept across frame sizes
•
Single piece housing to minimize leaks
•
Technologically advanced kit and servo system
•
Predictable, low friction swashplate bearing for precise machine control
Machine integration benefits
•
Industry leading pump length
•
Clean side for easier machine integration
•
Metric and Inch O-ring boss and Split flange (38/45 only) system port interfaces
•
Standard connection interfaces
Greater total efficiency
•
Increased pump efficiency
•
Lower control pressure for less power consumption
Control options
•
Electrical displacement control (EDC)
•
Manual displacement control (MDC)
•
Hydraulic displacement control (HDC)
•
Automotive control (AC-1, AC-2)
•
Forward-neutral-reverse (FNR)
•
Non-feedback proportional electric (NFPE)
•
Non-feedback proportional hydraulic (NFPH)
•
Common control across entire family
Expanded functionality
•
PLUS+1® Compliant control and options
•
Easy integration with Telematics
•
Integrated Flushing valve available
Modularity
•
Common control, charge pump and auxiliary pad options
•
Easy and quick conversion to the right configuration
DesignAxial piston pump with variable displacement using compact servo piston control.
Direction of input rotationClockwise or counterclockwise
Pump installation position is discretionary, however the recommended control position is
on the top or at the side with the top position preferred. If the pump is installed with the
control at the bottom, flushing flow must be provided through port M14 located on the
Recommended installation position
Filtration configurationSuction or charge pressure filtration
MP1 technical data
Feature28323845
Displacement (cm3/rev [in3/rev])28.0 [1.71]31.8 [1.94]38.0 [2.32]45.1 [2.75]
Flow at rated (continuous) speed (l/min [US gal/min])95.3 [25.2]108.1 [28.5]125.3 [33.1]149.5 [39.5]
Torque at maximum displacement (N•m/bar [lbf•in/1000psi])0.45 [272.0]0.51 [308.9]0.60 [369.1]0.72 [438.1]
Mass moment of inertia of rotating components (kg•m2 [slug•ft2])0.0020 [0.0015]0.0030 [0.0022]
Mass (kg [lb])29.6 [65.3]38 [83.8]
Oil volume (liter [US gal])1.5 [0.40]2.0 [0.53]
Mounting flangeISO 3019-1 flange 101-2 (SAE B)
Input shaft outer diameter, splines and tapered shaftsISO 3019-1, outer Ø22mm - 4 (SAE B, 13 teeth)
Auxiliary mounting flange with metric fasteners, shaft outer diameter
and splines
Main port configuration A, B
Case drain ports L1, L2
Suction ports S
Other portsISO 11926-1, (Inch O-ring boss)
Customer interface threadsMetric fasteners
EDC, HDC, FNR, NFPE, NFPH, AC-1, AC-2 and MDC control. Vertical input shaft installation is
acceptable. The housing must always be filled with hydraulic fluid. Recommended
mounting for a multiple pump stack is to arrange the highest power flow towards the
input source. Consult Danfoss for non-conformance to these guidelines.
ISO 3019-1, outer Ø25mm - 4 (SAE B-B, 15 teeth)
ISO 3019-1, outer Ø31mm - 4 (19 teeth)
ISO 3019-1, outer Ø22mm - 1 (Straight
Key)
ISO 3019-1, flange 82-2, outer Ø16mm - 4 (SAE A, 9 teeth)
ISO 3019-1, flange 82-2, outer Ø19mm - 4 (SAE A, 11 teeth)
ISO 3019-1, flange 101-2, outer Ø22mm - 4 (SAE B, 13 teeth)
ISO 3019-1, flange 101-2, outer Ø25mm - 4 (SAE B-B, 15 teeth)
ISO 11926-1 - 1 1/16 - 12 (Inch O-ring
boss)
ISO 6149-1, M27x2 (Metric o-ring boss)
ISO 11926-1, 1 1/16 -12 (Inch O-ring boss)
ISO 6149-1, M27x2 (Metric O-ring boss)
ISO 11926-1 - 1 1/16-12 (Inch O-ring
boss)
ISO 6149-1 - M27x2 (Metric O-ring
boss)
ISO 6149 -1, (Metric O-ring boss)
ISO 3019-1, outer Ø25mm - 4 (Straight
Key)
ISO 3019-1, outer Ø25mm -3 (Conical
keyed, taper 1:8)
ISO 11926-1 - 1 5/16 - 12 (Inch O-ring
boss)
ISO 6162, Ø19mm, (Split flange boss,
M10x1.5)
ISO 6149-1 - M33x2 (Metric O-ring
boss)
ISO 11926-1 - 1 5/16-12 (Inch O-ring
boss)
ISO 6149-1 - M33x2 (Metric O-ring
MP1 high pressure relief valve (HPRV) and charge check
All MP1 pumps are equipped with a combination high pressure relief and charge check valve. The highpressure relief function is a dissipative (with heat generation) pressure control valve for the purpose of
limiting excessive system pressures. The charge check function acts to replenish the low-pressure side of
the working loop with charge oil. Each side of the transmission loop has a dedicated HPRV valve that is
non-adjustable with a factory set pressure. When system pressure exceeds the factory setting of the
valve, oil is passed from the high pressure system loop, into the charge gallery, and into the low pressure
system loop via the charge check.
The pump order code allows for different pressure settings to be used at each system port. The system
pressure order code for pumps with only HPRV is a reflection of the HPRV setting.
HPRV´s are factory set at a low flow condition. Any application or operating condition which leads to
elevated HPRV flow will cause a pressure rise with flow above a valve setting. Consult factory for
application review. Excessive operation of the HPRV will generate heat in the closed loop and may cause
damage to the internal components of the pump.
Bypass function
The bypass function allows a machine or load to be moved without rotating the pump shaft or prime
mover. The single pump HPRV valve also provides a loop bypass function when each of the two HPRV hex
plugs are mechanically backed out three full turns.
Engaging the bypass function mechanically connects both A & B sides of the working loop to the
common charge gallery.
Possible damage to hydromotor(s).
Excessive speeds and extended load/vehicle movement must be avoided. The load or vehicle should be
moved not more than 20% of maximum speed and for a duration not exceeding 3 minutes. When the
bypass function is no longer needed, care should be taken to re-seat the HPRV hex plugs to the normal
operating position.
Danfoss | February 2022BC178386485160en-000503 | 11
Charge Pressure
Case Drain
P400341
Technical Information
MP1 Axial Piston Pumps Size 28/32, 38/45
Operation
MP1 charge pressure relief valve (CPRV) function
An internal charge pressure relief valve (CPRV) regulates charge pressure within the hydraulic circuit. The
CPRV is a direct acting poppet valve that regulates charge pressure at a designated level above case
pressure.
The charge pressure relief valve setting is specified within the model code of the pump. MP1 pumps with
charge pump have the CPRV set at 1800 rpm while MP1 pumps without charge pump have the CPRV set
with 18.9 l/min [5.0 US gal/min] of external supply flow. The charge pressure rise rate, with flow, is
approximately 1 bar/10 liter [5.4 psi/US gal].
MP1 pumps are available with an optional integral loop flushing. A loop flushing valve will remove heat
and contaminants from the main loop at a rate faster than otherwise possible.
The MP1 loop flushing design is a simple spring centered shuttle spool with an orifice plug. The shuttle
shifts at approximately . The flushing flow is a function of the low loop system pressure (charge) and the
size of the plug.
When a MP1 pump is used with an external loop flushing shuttle valve, ensure that the charge setting of
the pump matches the setting of the loop flushing shuttle valve. Contact your Danfoss representative for
the availability of additional charge relief settings.
Electrical displacement control (EDC)
EDC principle
An EDC is a displacement (flow) control. Pump swashplate position is proportional to the input command
and therefore vehicle or load speed (excluding influence of efficiency), is dependent only on the prime
mover speed or motor displacement.
The Electrical Displacement Control (EDC) consists of a pair of proportional solenoids on each side of a
three-position, four-way porting spool. The proportional solenoid applies a force input to the spool,
which ports hydraulic pressure to either side of a double acting servo piston. Differential pressure across
the servo piston rotates the swashplate, changing the pump‘s displacement from full displacement in
one direction to full displacement in the opposite direction. Under some circumstances, such as
contamination, the control spool could stick and cause the pump to stay at some displacement.
A 170 μm screen is located in the supply line immediately before the control porting spool.
Danfoss | February 2022BC178386485160en-000503 | 13
EDC schematic
"0"
-b-a
ba
100 %
100 %
Displacement
Current mA
Technical Information
MP1 Axial Piston Pumps Size 28/32, 38/45
Operation
EDC operation
EDC’s are current driven controls requiring a Pulse Width Modulated (PWM) signal. Pulse width
modulation allows more precise control of current to the solenoids. The PWM signal causes the solenoid
pin to push against the porting spool, which pressurizes one end of the servo piston, while draining the
other. Pressure differential across the servo piston moves the swashplate.
A swashplate feedback link, opposing control links, and a linear spring provide swashplate position force
feedback to the solenoid. The control system reaches equilibrium when the position of the swashplate
spring feedback force exactly balances the input command solenoid force from the operator. As
hydraulic pressures in the operating loop change with load, the control assembly and servo/swashplate
system work constantly to maintain the commanded position of the swashplate.
The EDC incorporates a positive neutral deadband as a result of the control spool porting, preloads from
the servo piston assembly, and the linear control spring. Once the neutral threshold current is reached,
the swashplate is positioned directly proportional to the control current. To minimize the effect of the
control neutral deadband, we recommend the transmission controller or operator input device
incorporate a jump up current to offset a portion of the neutral deadband.
The neutral position of the control spool does provide a positive preload pressure to each end of the
servo piston assembly.
When the control input signal is either lost or removed, or if there is a loss of charge pressure, the springloaded servo piston will automatically return the pump to the neutral position.
Control signal requirements, EDC MP1
Pump displacement vs. control current
EDC control current
Voltage12 V
Minimum current to stroke pumpa
Pin connectionsany order
*
Factory test current, for vehicle movement or application actuation expect higher or lower value.
Maximum current1800 mA920 mA
Nominal coil resistance@ 20 °C [68 °F]3.66 Ω14.20 Ω
Inductance33 mH140 mH
PWM signal frequencyRange70 – 200 Hz
IP RatingIEC 60 529IP 67
Connector colorBlack
*
PWM signal required for optimum control performance.
Pump output flow direction vs. control signal
Shaft rotationCWCCW
Coil energized
Port Aoutininout
Port Binoutoutin
Servo port pressurizedM4M5M4M5
*
For coil location see Installation drawings.
*
@ 80 °C [176 °F]4.52 Ω17.52 Ω
Recommended
DIN 40 050, part 9IP 69K with mating connector
*
100 Hz
C1C2C1C2
Control response
MP1 controls are available with optional control passage orifices to assist in matching the rate of swashplate response to the application requirements (e.g. in the event of electrical failure).
The time required for the pump output flow to change from zero to full flow (acceleration) or full flow to
zero (deceleration) is a net function of spool porting, orifices, and charge pressure.
A swash-plate response times table is available for each frame size. Testing should be conducted to verify
the proper orifice selection for the desired response. Typical response times at the following conditions:
Δ p = 250 bar [3626 psi]
Charge pressure = 20 bar [290 psi]
Viscosity and temperature = 30 mm²/s [141 SUS] and 50 °C [122 °F]
Speed = 1800 min-1 (rpm)
MP1 EDC response time
Stroking direction0.8 mm [0.03 in]
orifice
28/3238/4528/3238/4528/3238/4528/3238/45
Neutral to full flow1.3 s2.1 s0.9 s1.3 s0.6 s0.9 s0.4 s0.6 s
Full flow to neutral1.0 s1.5 s0.7 s0.9 s0.4 s0.6 s0.2 s0.3 s
1.0 mm [0.04 in]
orifice
1.3 mm [0.05 in]
orifice
No orifice
Manual override (MOR)
Initial actuation of the o-ring seal MOR plunger will require a force of 45 N. Additional actuations typically
require less force to engage the MOR plunger. Proportional control of the pump via the MOR is not
intended. The MOR plunger has a 4 mm diameter and must be manually depressed to be engaged.
Depressing the plunger mechanically moves the control spool which allows the pump to go on stroke.
Danfoss | February 2022BC178386485160en-000503 | 15
P003 204
Technical Information
MP1 Axial Piston Pumps Size 28/32, 38/45
Operation
Unintended MOR operation can cause the pump to go into stroke.
The vehicle or device must always be in a safe condition (example: vehicle lifted off the ground) when
using the MOR function. The MOR should be engaged anticipating a full stroke response from the pump.
Refer to control flow table for the relationship of solenoid to direction of flow.
An HDC is a Hydraulic Displacement Control. Pump swashplate position is proportional to the input
command and therefore vehicle speed or load speed (excluding influence of efficiency), is dependent
only on the prime mover speed or motor displacement.
The HDC control uses a hydraulic input signal to operate a porting spool, which ports hydraulic pressure
to either side of a double acting servo piston. The hydraulic signal applies a force input to the spool
which ports hydraulic pressure to either side of a double acting servo piston. Differential pressure across
the servo piston rotates the swashplate, changing the pump’s displacement from full displacement in
one direction to full displacement in the opposite direction. Under some circumstances, such as
contamination, the porting spool could stick and cause the pump to stay at some displacement.
A serviceable 175 μm screen is located in the supply line immediately before the control porting spool.
HDC control
HDC schematic
HDC operation
HDC’s are hydraulically driven control which ports hydraulic pressure to either side of a porting spool,
which pressurizes one end of the servo piston, while draining the other end to case. Pressure differential
across the servo piston moves the swashplate.
A swashplate feedback link, opposing control linkage, and a linear spring provide swashplate position
force feedback to the hydraulic pressure. As hydraulic pressures in the operating loop change with load,
the control assembly and servo/swashplate system work constantly to maintain the commanded position
of the swashplate.
Danfoss | February 2022BC178386485160en-000503 | 17
"0"
Signal pressure
Displacement
100 %
ab
-b-a
100 %
P102 031E
Technical Information
MP1 Axial Piston Pumps Size 28/32, 38/45
Operation
The HDC incorporates a positive neutral dead band as a result of the control spool porting, preloads from
the servo piston assembly, and the linear control spring. Once the neutral threshold point is reached, the
swashplate is positioned directly proportional to the control pressure.
When the control input is either lost or removed, or if there is a loss of charge pressure, the spring loaded
servo piston will automatically return the pump to the neutral position.
Pump displacement vs signal pressure
Hydraulic signal pressure range
TypeUnitStart of controlEnd of control
Optionbar3.011.6
Standard4.216.2
Pump output flow direction vs. control pressure
Shaft rotation HDCClockwise (CW) seen from shaftCounter Clockwise (CCW) seen from shaft
Port energizedX1X2X1X2
Port AOut (high)In (low)In (low)Out (high)
Port BIn (low)Out (high)Out (high)In (low)
Servo port high
pressure
M4M5M4M5
For appropriate performance of HDC characteristic, keep the drain pressure of pilot valve to be equal or
slightly higher than pump case pressure.
Control response
MP1 controls are available with optional control passage orifices to assist in matching the rate of swashplate response to the application requirements (e.g. in the event of electrical failure).
The time required for the pump output flow to change from zero to full flow (acceleration) or full flow to
zero (deceleration) is a net function of spool porting, orifices, and charge pressure.
A swash-plate response times table is available for each frame size. Testing should be conducted to verify
the proper orifice selection for the desired response. Typical response times at the following conditions:
Δ p = 250 bar [3626 psi]
Charge pressure = 20 bar [290 psi]
Viscosity and temperature = 30 mm²/s [141 SUS] and 50 °C [122 °F]
Speed = 1800 min-1 (rpm)
Danfoss | February 2022BC178386485160en-000503 | 19
-18° -13° -8°
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
Swashplate angle
Sensor output, % of supply voltage
-3° 0° 2° 7° 12° 17°
W
Technical Information
MP1 Axial Piston Pumps Size 28/32, 38/45
Operation
Swashplate angle sensor for EDC controls
The angle sensor detects the swash plate position with an accuracy dependent upon the calibration
effort done for the application and direction of rotation from the neutral position. At minimum the sensor
can be used for forward, neutral and reverse (FNR) detection.
The sensor works on the hall-effect technology. The implemented technology is based on a
measurement of the magnetic field direction in parallel to the chip surface. This field direction is
converted to a voltage signal at the output.
Enhanced calibration of the non-linear behavior leads to more exact calculation of the pump swashplate
angle. The 4-pin DEUTSCH connector is part of the sensor housing. The swashplate angle sensor is
available for all EDC controls for 12 V and 24 V.
Swashplate angle vs. output of supply voltage
Warning
Strong magnetic fields in the proximity of the sensor can influence the sensor signal and must be
avoided.
Contact your Danfoss representative in case the angle sensor will be used for safety functions.
Swash plate angle sensor parameters (EDC)
ParameterMinimumTypicalMaximum
Supply voltage range
Supply protection
Pump neutral output (% of supply voltage)
Working range (swash plate angle)
Required supply current
Output current signal
Calibration of the sensor output within the software is mandatory. Vehicle neutral thresholds in the
software (±0.5°) are vehicle dependent and must consider different conditions, example: system
temperature, system pressure and/or shaft speed.
For safety function: If the sensor fails (invalid signal <10% or >90% of supply voltage), it must be sure
that the ECU will go into a diagnostic mode and shift into limited mode in order for the driver to take the
full control or the mechanical breaks should be activated. Strong magnetic fields in the proximity of the
sensor can influence the sensor signal and must be avoided.
An MDC is a Manual proportional Displacement Control (MDC). The MDC consists of a handle on top of a
rotary input shaft. The shaft provides an eccentric connection to a feedback link. This link is connected on
its one end with a porting spool. On its other end the link is connected the pumps swashplate.
Danfoss | February 2022BC178386485160en-000503 | 21
This design provides a travel feedback without spring. When turning the shaft the spool moves thus
providing hydraulic pressure to either side of a double acting servo piston of the pump.
Differential pressure across the servo piston rotates the swash plate, changing the pump’s displacement.
Simultaneously the swashplate movement is fed back to the control spool providing proportionality
between shaft rotation on the control and swashplate rotation.
P301 749
"0"
Lever rotation
"A"
Displacement
100 %
a
-a
100 %
"B"
-b
-d
b
c
d
-c
P301 752
P005 701
M14
M5
M4
M3
Technical Information
MP1 Axial Piston Pumps Size 28/32, 38/45
Operation
The MDC changes the pump displacement between no flow and full flow into opposite directions. Under
some circumstances, such as contamination, the control spool could stick and cause the pump to stay at
some displacement.
A 170 μm screen is located in the supply line immediately before the control porting spool.
The MDC is sealed by means of a static O-ring between the actuation system and the control block. Its
shaft is sealed by means of a special O-ring which is applied for low friction. The special O-ring is
protected from dust, water and aggressive liquids or gases by means of a special lip seal.
Manual Displacement Control
Pump displacement vs. control lever rotation
MDC schematic diagram
Where:
Deadband on B side – a = 3° ±1°
Maximum pump stroke – b = 30° +2/-1°
Required customer end stop – c = 36° ±3°
Internal end stop – d = 40°
MDC torque
Torque required to move handle to maximum displacement
Torque required to hold handle at given displacement
Maximum allowable input torque
MDC operation
The MDC provides a mechanical dead-band required to overcome the tolerances in the mechanical
actuation. The MDC contains an internal end stop to prevent turning the handle into any inappropriate
position.
The MDC provides a permanent restoring moment appropriate for turning the MDC input shaft back to
neutral position only. This is required to take the backlash out of the mechanical connections between
the Bowden cable and the control.
High case pressure may cause excessive wear and the NSS to indicate that the control is not in neutral
position. In addition, if the case pressure exceeds 5 bar there is a risk of an insufficient restoring moment.
The MDC is designed for a maximum case pressure of 5 bar and a rated case pressure of 3 bar.
Customers must install some support to limit the setting range of their Bowden cable to avoid an
•
overload of the MDC.
Customers can apply their own handle design but they must care about a robust clamping
•
connection between their handle and the control shaft and avoid overload of the shaft.
Customers can connect two MDC’s on a tandem unit in such a way that the actuation force will be
•
transferred from the pilot control to the second control. The kinematic of the linkages must ensure
that either control shaft is protected from torque overload.
1.4 N•m [12.39 lbf•in ]
0.6 N•m [5.31 lbf•in]
20 N•m [177 lbf•in]
Caution
Using the internal spring force on the input shaft is not an appropriate way to return the customer
connection linkage to neutral, or to force a Bowden cable or a joystick back to neutral position. It is not
applicable for any limitation of the Bowden cable stroke, except the applied torque to the shaft will never
exceed 20 N•m.
MDC shaft rotation
Pump shaft rotation
MDC shaft rotationCWCCWCWCCW
Port Ain (low)out (high)out (high)in (low)
Port Bout (high)in (low)in (low)out (high)
Servo port high pressureM5M4M5M4
Danfoss | February 2022BC178386485160en-000503 | 23
P005 702
M14
M5
M4
M3
Technical Information
MP1 Axial Piston Pumps Size 28/32, 38/45
Operation
Control response
MP1 controls are available with optional control passage orifices to assist in matching the rate of swashplate response to the application requirements (e.g. in the event of electrical failure).
The time required for the pump output flow to change from zero to full flow (acceleration) or full flow to
zero (deceleration) is a net function of spool porting, orifices, and charge pressure.
A swash-plate response times table is available for each frame size. Testing should be conducted to verify
the proper orifice selection for the desired response. Typical response times at the following conditions:
Δ p = 250 bar [3626 psi]
Charge pressure = 20 bar [290 psi]
Viscosity and temperature = 30 mm²/s [141 SUS] and 50 °C [122 °F]
Speed = 1800 min-1 (rpm)
MP1 MDC response time
CodeOrifice description (mm)Stroking direction (sec)
PABTank (A
C3
C6
C7
C8
C9
D1
D2
D3
D4
D5
––––0.30.30.30.3
–––1.00.51.00.50.7
–––1.30.40.70.50.5
0.8––0.61.52.61.41.9
1.0––0.61.32.41.11.8
1.0––0.80.91.60.81.1
1.3––0.80.81.50.71.1
1.3––1.00.61.10.60.8
1.31.31.31.00.81.30.70.9
0.60.80.80.63.24.02.02.9
+B)
Neutral to full flowFull flow to neutral
28/3238/4528/3238/45
Neutral start switch (NSS)
The Neutral Start Switch (NSS) contains an electrical switch that provides a signal of whether the control
is in neutral. The signal in neutral is Normally Closed (NC).
Danfoss | February 2022BC178386485160en-000503 | 25
P003 193
P003 189
C2C1
F00A
M14
TPF00B
Technical Information
MP1 Axial Piston Pumps Size 28/32, 38/45
Operation
Forward-neutral-reverse (FNR) electic control
FNR principle
The 3-position FNR control uses an electric input signal to switch the pump to a full stroke position.
Under some circumstances, such as contamination, the control spool could stick and cause the pump to
stay at some displacement.
A 170 μm screen is located in the supply line immediately before the control porting spool.
Danfoss | February 2022BC178386485160en-000503 | 27
Technical Information
MP1 Axial Piston Pumps Size 28/32, 38/45
Operation
Solenoid data (continued)
Voltage12 V24 V
PWM Frequency (preferred)
IP Rating (IEC 60 529) + DIN 40 050, part 9
Bi-directional diode cut off voltage
*
PWM signal required for optimum control performance.
Pump output flow direction vs. control signal
Shaft rotationCWCCW
Coil energized
Port Ainoutoutin
Port Boutininout
Servo port pressurizedM5M4M5M4
*
For coil location see Installation Drawings.
*
*
100 Hz
IP 67 / IP 69K (part 9 with mating connector)
28 V
DC
C1C2C1C2
53 V
DC
Control response
MP1 controls are available with optional control passage orifices to assist in matching the rate of swashplate response to the application requirements (e.g. in the event of electrical failure).
The time required for the pump output flow to change from zero to full flow (acceleration) or full flow to
zero (deceleration) is a net function of spool porting, orifices, and charge pressure.
A swash-plate response times table is available for each frame size. Testing should be conducted to verify
the proper orifice selection for the desired response. Typical response times at the following conditions:
Δ p = 250 bar [3626 psi]
Charge pressure = 20 bar [290 psi]
Viscosity and temperature = 30 mm²/s [141 SUS] and 50 °C [122 °F]
Speed = 1800 min-1 (rpm)
Response time, FNR
Stroking
direction
Neutral to
full flow
Full flow to
neutral
0.8 mm [0.03 in] orifice 1.0 mm [0.04 in] orifice 1.3 mm [0.05 in] orifice No orifice
28/3238/4528/3238/4528/3238/4528/3238/45
2.1 s2.6 s1.1 s1.6 s0.8 s1.1 s0.7 s0.7 s
1.1 s1.8 s0.9 s1.0 s0.6 s0.7 s0.3 s0.3 s
Non feedback proportional electric control (NFPE)
The Non Feedback Proportional Electric (NFPE) control is an electrical automotive control in which an
electrical input signal activates one of two proportional solenoids that port charge pressure to either side
of the pump servo cylinder. The NFPE control has no mechanical feedback mechanism.
A serviceable 170 μm screen is located in the supply line immediately before the control porting spool.
Under some circumstances, such as contamination, the control spool could stick and cause the pump to
stay at some displacement.
The pump displacement is proportional to the solenoid signal current, but it also depends upon pump
input speed and system pressure. This characteristic also provides a power limiting function by reducing
the pump swashplate angle as system pressure increases. A typical response characteristic is shown in
the accompanying graph. Under some circumstances, such as contamination, the control spool could
stick and cause the pump to stay at some displacement.
NFPE pump displacement to input signal
Control signal requirements
Control current
Voltagea
12 V600 mA1080 mA1360 mAany order
24 V300 mA540 mA680 mA
*
Factory test current, for vehicle movement or application actuation expect higher or lower value.
Maximum current1800 mA920 mA
Nominal coil resistance@ 20 °C [68 °F]3.66 Ω14.20 Ω
Inductance33 mH140 mH
PWM signal frequencyRange70 – 200 Hz
IP RatingIEC 60 529IP 67
Connector colorBlack
*
PWM signal required for optimum control performance.
@ 80 °C [176 °F]4.52 Ω17.52 Ω
Recommended
DIN 40 050, part 9IP 69K with mating connector
*
100 Hz
Pump output flow direction vs. control signal
Shaft rotationCWCCW
Coil energized
Port Ainoutoutin
Port Boutininout
Servo port pressurizedM5M4M5M4
*
For coil location see Installation drawings.
*
C1C2C1C2
Control response
MP1 controls are available with optional control passage orifices to assist in matching the rate of
swashplate response to the application requirements (e.g. in the event of electrical failure). The time
required for the pump output flow to change from zero to full flow (acceleration) or full flow to zero
(deceleration) is a net function of spool porting, orifices, and charge pressure. A swashplate response
table is available for each frame indicating available swashplate response times. Testing should be
conducted to verify the proper orifice selection for the desired response.
Typical response times at the following conditions:
∆p
Viscosity and temperature
Charge pressure
Speed