Pressure Compensator Override With Brake Pressure Defeat Configuration - Danfoss H1 Series Technical Information

Technical Information
H1 Bent Axis Variable Displacement Motors, Size 060/080/110/160/210/250
Controls – nomenclature, description
84 | © Danfoss | December 2016

Pressure Compensator OverRide with Brake Pressure Defeat configuration

A brake pressure defeat (BPD) shuttle valve ahead of the pressure compensator prevents operation in the
deceleration direction (when motor is running in pump mode). This is designed to prevent rapid or
uncontrolled deceleration while the vehicle/machine is slowing down.
Pressure compensator override with brake pressure defeat is mainly used in systems with pumps having
electric or hydraulic proportional controls or automotive controls.
The brake pressure defeat must be controlled by a 2-line external signal based on direction of motor
rotation, see the following table:
Pressure Compensator OverRide (PCOR) operation
Motor rotation High pressure port
CW A
CW A
CCW B
CCW B
1)
Differential control pressure between ports XA and XB: p
PCOR active port not defined without minimum pressure difference between XA and XB.
W
Warning
Zero degree capability results in a high risk of overspeed and drops in efficiency if the motor operates
between 0–20% displacement.
1)
Control pressure on port PCOR function
yes
XA
no
XB
no
XA
yes
XB
= 2.5 bar [36 psi] and p = 50 bar [725 psi]
min max
11037153 | BC00000043en-US1103