Siemens Sinumerik 840D Series Function Manual page 244
Hla module
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A Hydraulics
A.1 Servo solenoid valves
Flow
characteristic,
with knee
Linearization of
knee-shaped flow
characteristic
A-244
Valves with a knee-shaped flow characteristic give the drive greater manipu-
lated variable resolution in the lower signal range (better processing quality)
and, at the same time, offer sufficient flow rate in the upper range (high rapid
traverse velocity).
Fig. A-8
Flow characteristic with knee, example 40% - knee
Î Î Î Î Î Î Î
Î Î Î Î Î Î Î
Î Î Î Î Î Î Î
Î Î Î Î Î Î Î
Spool stroke
Fig. A-9
Stepped control window in spool sleeve, example 40% - knee
The knee-shaped characteristic of the valve is linearized in the HLA module to
match it to the closed-loop control of the overall drive (cylinder). No steady-state
operating point should be defined in the knee-point area.
The corresponding valve data are stored in the HLA module and automatically
parameterized when the order number is entered.
Q/Q
Fig. A-10
Electrical valve knee compensation
SINUMERIK 840D/SIMODRIVE 611 digital, HLA Module (FBHLA) - 10.03 Edition
Q/Q
nom
Rapid traverse
10%
40%
Machining velocity
Q/Q
nom
40 %
nom
Valve characteristic
Linearized characteristic
10%
U/U
40%
compensation
Siemens AG, 2003. All rights reserved
10.03
U/U
nom
U/UU
nom
nom
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