Danfoss Series 42

pressure. This characteristic provides a power limiting function by reducing displacement as system
pressure increases.
NFPH control on series 42 pump
Non-feedback proportional electric (NFPE) control
The Non-Feedback Proportional Electric (NFPE) control is an electric control. A PWM input signal to one of
two solenoids on the control valve ports charge pressure to one side of the servo piston.
Pump displacement is proportional to the signal current. However, because this control does not use
mechanical feedback, displacement also depends on input speed and system pressure. This characteristic
provides a power limiting function by reducing displacement as system pressure increases.
NFPE control on series 42 pump (28/32cc)
Service Manual
Series 42 Axial Piston Closed Circuit Pumps
Control Options
520L0638 • Rev 0300 • July 2015 19