Non Feedback Proportional Electric Control (NFPE), options: A8 (12 V) / B8 (24 V)
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. 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.
A serviceable 125 μm screen is located in the supply line immediately before the control porting spool.
NFPE Control
NFPE schematic
P003 188
C2C1
F00A
M14
T PF00B
Pump displacement vs. input signal
"0"
Signal Current
mA(DC)
a b c
a
b
c
Displacement
100 %
100 %
NFPE control
∆p = 300 bar
∆p = 300 bar
∆p = 0 bar
∆p = 0 bar
P003 187E
Control signal requirements, NFPE 069/078
Control minimum current to stroke pump
Voltage a
*
b Pin connections
12 V 640 mA 1640 mA any order
24 V 330 mA 820 mA
*
Factory test current, for vehicle movement or application actuation expect higher or lower value.
Technical Information H1 Axial Piston Single Pumps, Size 069/078
Control options
11062169 • Rev 0700 • November 2015 25
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