10.03
2.3 Configuring the hydraulic drive
2-39
Siemens AG, 2003. All rights reserved
SINUMERIK 840D/SIMODRIVE 611 digital, HLA Module (FBHLA) - 10.03 Edition
Table 2-10 NG16 pilot-controlled HR servo solenoid valves; model code 4WRVE 16
HLA
code
no.
Rexroth
order num-
ber
Q
nom
(l/min) for
np / edge =
5 bar
Character-
istic kneep-
oint (%)
No. of
connec-
tor pins
Graphic symbol Rexroth
catalog
5 0 811 404 296 90 40 12-pin
OB
/BR1/
6 0 811 404 297 150 40
7 0 811 404 298 A:90; B:50
1)
40
8 0 811 404 299 A:150;
B:90
1)
40
1) Asymmetrical characteristic
2.3.3 Selection of shutoff valves
References:/BR3/, “Adapter plate valves” catalog
The shutoff valves are automatically enabled and disabled in the correct switch-
ing sequence by the HLA module.
Start condition: The hydraulic pressure must be available before
the system is switched on.
!
Warning
In the event of sudden failure (e.g. open circuit) of the external 24 V supply, an
axial storage capacitor on the HLA module provides energy to supply the servo
solenoid valve until such time as the pressure supply for a configured shutoff
valve is disabled.
The machine manufacturer must verify the interaction between valves, making
allowance for all tolerances in the controlled system.
The energy content of the storage capacitors is dependent upon
S the tolerances of the capacitors,
S the voltage level of the external supply and
S the charging time of the integrated capacitors (instant of voltage failure).
The available response time is mainly defined by
S the power required for the current machining step,
S the response time of the shutoff valves and
S the trip threshold of the servo solenoid valves.
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