Control start setting range (pressure above case pressure)
p
start
(possible settings per MMC.- adjustable)
2 to 30 bar [29 to 435 psi]
P
max allowable
Control start s 50 bar [725 psi]
Control ramp
From 100% to 20% displacement
14 bar [203 psi]
From 100% to 0% displacement
17.5 bar [254 psi]
Formulas to calculate start and end input command
Control type
Input command (bar)
% displacement
All sizes (bar)
DH
Start input command
from 100%
p
start
± 0.5
from y% max.
(1 - V
gy
/V
gmax
) x 17.5 + p
start
± 0.5
End input command
at 0%
p
start
+ 17.5 ± 2.5
at x% min.
(1 - V
gx
/V
gmax
) x 17.5 + p
start
± 2.5
Where:
V
gmax
Maximum, theoretic possible motor displacement per revision (cm
3
/rev)
V
gx
Minimum displacement setting of desired unit (cm
3
/rev)
V
gy
Maximum displacement setting of desired unit (cm
3
/rev)
x
Minimum displacement (%)
y
Maximum displacement (%)
Pressure Compensator OverRide (PCOR) with Brake Pressure Defeat (BPD) 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
Control pressure on port
1)
PCOR function
CW
A
XA
no
CW
A
XB
yes
CCW
B
XA
yes
CCW
B
XB
no
1)
Differential control pressure between ports XA and XB: p
min
= 2.5 bar [36 psi] and p
max
= 50 bar [725 psi]
W
Warning
Zero degree capability results in a high risk of overspeed and drops in efficiency if the motor operates
between 0–20% displacement.
Technical Information
H1 Bent Axis Variable Displacement Motors, Size 060/080/110/160/210/250
Controls – nomenclature, description
©
Danfoss | December 2016
11037153 | BC00000043en-US1103 | 75