Danfoss H1 Series, Основная информация

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Forward-Neutral-Reverse (FNR) electric control
The 3-Position (F-N-R) 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 serviceable 125 µm screen is located in the supply line immediately before
the control porting spool.
FNR control
P003 193
3-Position electric control, hydraulic schematic
P003 189
C2 C1
F00A
M14
T P F00B
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. 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. 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
P003 192
NFPE schematic
P003 188
C2 C1
F00A
M14
T P F00B
Basic Information
H1 Axial Piston Pumps, Single and Tandem
Operation
14 | © Danfoss | April 2017 11062168 | BC00000057en-US0602