User Manual

Mobile Hydraulics Bosch Rexroth AG
Dual Path Control DPC
RE 95 325/03.04
3/16
Figure 1: Typical configuration for DPCA
Travel Behavior
Travel behavior is controlled by two variables:
• The setpoint is defined with the joystick.
• The acceleration behavior is defined by time ramps. These
variable time ramps determine how quickly the actuation at
the PWM output is altered.
The joystick is in the neutral position in terms of travel direction
(forwards or backwards) and steering direction (left or right),
if it is positioned within a user-definable range around the zero
position. This range is called the dead band. The dead band
can be set for both deflection directions separately.
When the joystick is in the neutral position, the PWM outputs
for the forwards and backwards travel directions for actuat
-
ing the proportional solenoids of the left and right pumps are
turned off.
If the joystick is moved forwards or backwards to a posi
-
tion outside the dead band, the current at the relevant PWM
outputs (for forwards or backwards travel direction) increases
according to the position of the joystick and the chosen time
ramp. The corresponding proportional solenoids of the left and
right pumps are actuated. The park brake is released.
Two pushbuttons are incorporated into the joystick. When
deflecting the joystick, these pushbuttons can also be used for
very fine stepwise increase or reduction of the maximum travel
speed. Pressing the button changes the speed range which
corresponds to full deflection of the joystick.
When the joystick is returned to the neutral position, the park
brake is activated after a user-definable period.
When the travel direction is changed, the park brake is not acti
-
vated. Deceleration and acceleration for the change of travel
direction are determined by a common, adjustable time ramp.

Power
supply
EMERGENCY
STOP
Control unit RC6-9
with DPCA software
PC software
BODEM
RS232
Diagnostics
socket
CAN bus
interface
Control panel
BB-3
Light showing
operating statuses
Joystick
HG
Safety switch
Speed sensor
Engine
Variable displacement pumps
A4VG...EP
or
A10VG...EP
RS232
Variable displacement motors
A6VM...EP or
A6VE...EP or
A10VM...EP
CAN bus
Brake
Reverse travel
warning signal
Set speed
Ignition lock
Speed sensors