Selection Of Shutoff Valves - Siemens Sinumerik 840D Series Function Manual

10.03
Table 2-10 NG16 pilot-controlled HR servo solenoid valves; model code 4WRVE 16
HLA Rexroth
code order num-
no. ber np / edge =
5 0 811 404 296
6 0 811 404 297
7 0 811 404 298 A:90; B:50
8 0 811 404 299
1) Asymmetrical characteristic
2.3.3

Selection of shutoff valves

General
!
 Siemens AG, 2003. All rights reserved
SINUMERIK 840D/SIMODRIVE 611 digital, HLA Module (FBHLA) - 10.03 Edition
Q Character-
nom
(l/min) for istic kneep-
oint (%)
5 bar
90 40
150 40
1)
40
A:150; 40
1)
B:90
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.
2.3 Configuring the hydraulic drive
No. of Graphic symbol
connec-
tor pins
12-pin
O B O B
X X P T P T
2 Configuration
Rexroth
catalog
/BR1/
Y Y
2-39