RE 30011-B, Edition 10.2021, Bosch Rexroth AG
Product description |
Pressure and flow control system SYDFE1 series 2X, 3X
27/96
At a pilot oil pressure of 20 bar the brief pilot oil requirement during swiveling is
ca. 17 l/min. In practice, this amount of pilot oil is needed only, if the operating
pressure is less than 20 bar during the entire swiveling process and thus the entire
pilot oil demand must be supplied by the external source.
In the steady-state, balanced condition, the pilot oil requirement is less than 1 l/
min.
Experience has shown that, depending on the operating pressure and swiveling
frequency, the actual pilot oil demand is in the order of 5...15 l/min. In the case
of external supply, a smaller pump size may be selected if an accumulator is
provided.
5.6
AMBIENT CONDITIONS
5.6.1 Oil-immersed applications
The SYDFE1 control system is suitable for oil-immersed applications.
5.6.2 Ambient temperature
The permissible maximum ambient temperature for SYDFE1 control systems is 70
°C at the pump and 50 °C at control electronics VT 5041-3X.
We recommend the installation within a ventilated area with moved ambient air,
e.g. in the air flow of an electric motor.
5.7
NOTES ON THE SELECTION OF HYDRAULIC FLUIDS
The SYDFE1 control system is designed for operation with hydraulic fluids in
accordance with DIN 51 524 (HL/HLP).
We recommend that you select the operating viscosity (at operating temperature)
within the following range, which is optimum in terms of efficiency and service life:
• ν
opt
= optimum operating viscosity 16...36 mm²/s
This range is referred to the tank temperature in the open circuit.
The following values are valid for limiting operating conditions:
• ν
min
= 10 mm²/s
Briefly, at max. permissible case drain oil temperature of 90 °C
• ν
max
= 1000 mm²/s
Briefly, during cold start
The temperature of the hydraulic fluids lies between the following values: (cf.
selection diagram)
• t
min
= -20 °C
• t
max
= 70 °C
Notes on dimensioning
Operating viscosity
Viscosity limits
Temperature range
