Control options
To enhance the performance of our motors, several options are available to augment the performance of
the control system. These control enhancements include:
•
Pressure Compensator Over Ride, PCOR
•
Proportional Pressure Compensator Over Ride, PPCOR and
•
Brake Pressure Defeat, BPD
PCOR
The de-energized electric control keeps the motor at minimum displacement.
The electric control can be overridden by the PCOR using high loop system pressure. When the system
pressure rises above the PCOR setting, the PCOR override will be activated. The motor then increases to
maximum displacement.
The motor displacement is regulated automatically between minimum and maximum in response to the
high loop pressure. This ensures optimal power throughout the entire displacement range of the motor.
The pressure compensator control can also be overridden with an electric off/on-solenoid option. When
the solenoid is energized, the motor strokes to maximum displacement and stays at that position until
the solenoid is de-energized.
Electric proportional with PCOR
In the de-energized state, the electric proportional control keeps the motor at minimum displacement
until system pressure rises above the PCOR setting. When the PCOR activates, it ports high system
pressure to the larger end of the servo piston, increasing the motor displacement to maximum.
Electric two-position with PCOR
In the de-energized state, the electric two-position control supplies both sides of the servo piston and
keeps the motor at minimum displacement as long as the high loop pressure remains below the pressure
compensator setting. If the high loop pressure rises above the pressure compensator setting, the porting
spool ports the larger diameter of the servo piston to tank. The motor strokes in the direction of
maximum displacement.
Electric two-position with proportional PCOR
The PPCOR valve consists of an electric proportional solenoid and a two-position, three-way porting
spool with an adjustable spring force on the opposite end of the spool. Maximum signal current to the
proportional solenoid overrides the pressure compensator and strokes the motor to maximum
displacement. The proportional solenoid changes the pressure compensator setting to allow different, on
the go, settings.
The solenoid and the high system pressure work against the spring on the end of the two-position, three-
way porting spool. With decreased signal current on the proportional solenoid, the reduction of the
forces from the proportional solenoid cause an increased pressure compensator setting for the high
system pressure and consequently provides a proportional pressure compensator.
During production test, the PPCOR setting is adjusted to 240 bar with the adjusting screw on the control
housing in reference to input current of:
•
800 mA for P1 (12 V)
•
400 mA for P2 (24 V)
Technical Information
H1 Bent Axis Variable Displacement Motors, Size 060/080/110/160/210/250
Control operation and description
©
Danfoss | December 2016
11037153 | BC00000043en-US1103 | 37
