RE 30011-B, Edition 10.2021, Bosch Rexroth AG
Product description |
Pressure and flow control system SYDFE1 series 2X, 3X
19/96
The sectional drawings overleaf show the mechanical basic position “+100 %“ of
the pump (depressurized, drive at rest). This corresponds to the maximum swivel
angle of the pump.
Zero stroke pressure: Pressure, which the pump with internal supply generates for
its own supply without activation of the pilot valve. The pressure level is usually
within the range of 8 to 12 bar. This pressure level can only be achieved when the
maximum oil flow, which the pump can deliver, is not exceeded. After the electric
drive was started, the pump with
internal supply
automatically swivels in to zero
stroke operation
• when the enable of the control electronics is
missing
or
• in the case of an error message of the control electronics (condition: VT 5041-
3X: J1 OFF) or
• in the de-energized state of the control electronics
provided that the required pilot pressure can be built up (consumer line is
closed).
In contrast to this, the pump with
external supply
swivels in to the
negative limit
stop “-100 %“
under the above conditions
!
NOTICE
! Cavitation of the pump!
Risk of damage to the pump in the case of systems with external supply.
▶ To prevent damage to the pump, provide a pressure relief/anti-cavitation valve
for systems with external supply. If a fault occurs during operation - not during
start-up - the motor must be switched off.
5.3
CONTROLLER STRUCTURE AND BASIC OPERATING
MODES
The controller structure is illustrated in the figure below.
Fig. 4: Controller structure
Up to three controllers are continuously active in the possible operating modes:
• Swivel angle controller
• Pressure controller
• Power limitation (optional)
These controllers alternate automatically and jerk-free through evaluation of
minimum value comparators.
During steady-state operation, one of the above controllers is active. For the other
controllers, the actual value is smaller than the command value.
Basic positions of the
swivel angle adjustment
feature
Controller structure
SYD_006
s
U
U
p
s
U
Power
controller
(option)
(Pin 24c)
Actual pressure (pin 8c/10c)
Pressure
controller
Minimum
value
comparator
Flow
controller
Minimum
value
comparator
Valve
controller
Valve command value
Power setpoint
(potentiometer or
pin 18c/20c)
Swivel angle setpoint
(pin 14c/16c)
Actual swivel angle (pin 12c)
Pressure setpoint (pin 6c/4c)
Basic operating modes
