RE 30017-B, Edition 11.2021, Bosch Rexroth AG
Product description |
SYDFED-2X, SYDFED-3X, SYHDFED-1X
29/96
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 pilot oil supply, the pump size may be reduced by installing an
accumulator.
5.4
AMBIENT CONDITIONS
5.4.1 Oil-immersed applications
Only the SY(H)DFE1 control system is suitable for oil-immersed applications.
SY(H)DFEx systems with integrated electronics must not be immersed.
5.4.2 Ambient temperature
The permissible maximum ambient temperature for SY(H)DFED control systems is
50 °C. Strictly observe the data in the valid RE data sheets for SY(H)DFED control
systems.
We recommend the installation within a ventilated area with moved ambient air,
e.g. in the air flow of an electric motor.
This is valid in particular in view of the place of installation of the integrated
on-board electronics.
5.5
NOTES ON THE SELECTION OF HYDRAULIC FLUIDS
The SYDFED control system is designed for operation with hydraulic fluids in
accordance with DIN 51 524 (HL/HLP). The use of HFC is permitted only for
SYHDFED.
▶ Adhere to all limits specified in the data sheet regarding temperature, viscosity,
cleanliness of the hydraulic fluid.
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
you should select: 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
Operating viscosity
Viscosity limits
Temperature range