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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
5.4.1
5.4.2
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.
5.5
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,
We recommend that you select the operating viscosity (at operating temperature)
Operating viscosity
within the following range, which is optimum in terms of efficiency and service life:
• ν
you should select: This range is referred to the tank temperature in the open
circuit.
The following values are valid for limiting operating conditions:
Viscosity limits
• ν
• ν
The temperature of the hydraulic fluids lies between the following values: (cf.
Temperature range
selection diagram)
• t
• t
Product description | SYDFED-2X, SYDFED-3X, SYHDFED-1X
AMBIENT CONDITIONS
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.
Ambient temperature
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.
NOTES ON THE SELECTION OF HYDRAULIC FLUIDS
cleanliness of the hydraulic fluid.
= optimum operating viscosity
opt
= 10 mm²/s
min
Briefly, at max. permissible case drain oil temperature of 90 °C
= 1000 mm²/s
max
Briefly, during cold start
= -20 °C
min
= 70 °C
max
16...36 mm²/s
RE 30017-B, Edition 11.2021, Bosch Rexroth AG
29/96
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