Supply Unit Data; Valve - Siemens SINAMICS S120 System Manual

Drive functions

5.6 Supply unit data

5.6 Supply unit data
The supply unit is defined by:
● The modulus of elasticity of the hydraulic fluid (p0220)
p0220 defines the compressibility of the hydraulic fluid. This value specifies the pressure
change that is required to achieve a certain volume change. The modulus of elasticity
refers to a relative volume.
● The system pressure (p0221)
p0221 defines the pressure supplied by the drive unit. The system pressure and the size
of the piston area determine the force available at the piston rod.
● For precontrolled valves, in addition by the precontrol pressure (p0222)
p0222 defines the pressure for a precontrolled valve. Zero must be entered for non-
precontrolled valves.
p0222 is used for "Calculate controller data".
This data influences the limit data (maximum velocity, maximum force...) as well as the
dynamic response characteristics of the drive system (corner frequencies).
Note
The elasticity of oil variable as a function of the temperature can be ignored for industrial
hydraulics.
Overview of important parameters (see SINAMICS S120/S150 List Manual)
• p0220
• p0221
• p0222
5.7

Valve

Valve data
The nominal valve data defines the key valve data at the nominal operating point. This is
defined by:
● Rated flow rate
● Rated pressure drop
● Rated voltage
180
Hydraulic oil modulus of elasticity
System pressure
Valve precontrol pressure
System Manual, 04/2015, 6SL3097-4BA00-0BP1
Hydraulic Drive