Siemens Sinumerik 840D Series Function Manual

10.03
4.7 Valve
4-135
 Siemens AG, 2003. All rights reserved
SINUMERIK 840D/SIMODRIVE 611 digital, HLA Module (FBHLA) - 10.03 Edition
A valve characteristic as shown in Fig. 2-8 results in an entry of 10% in
MD 5110 and 40% in MD 5111. Entering the same value in both machine pa-
rameters produces a linear characteristic (default setting).
5112 VALVE_FLOW_FACTOR_A_B Cross reference: -
Valve flow rate ratio between A and B ends of valve Related to:
HLA
Protection level:
3/3
Unit:
-
Default:
1.0
Minimum:
0.5
Maximum:
2.0
Data type:
FLOAT
Active:
Immediately
The flow ratio specifies the ratio between the nominal flow towards the A end
and the nominal flow towards the B end.
5114 VALVE_NATURAL_FREQUENCY Cross reference: -
Natural frequency of valve Related to:
HLA
Protection level:
3/3
Unit:
Hz
Default:
150.0
Minimum:
1.0
Maximum:
1000.0
Data type:
FLOAT
Active:
Immediately
5115 VALVE_DAMPING Cross reference: -
Valve damping Related to:
HLA
Protection level:
3/3
Unit:
-
Default:
0.8
Minimum:
0.4
Maximum:
1.0
Data type:
FLOAT
Active:
Immediately
To dimension the velocity controller, the transmission behavior of the valve on
conversion of the voltage setpoint to the spool position is approximated as a
PT2 low-pass.
The valve’s natural frequency can be read for a phase shift of -180°. The
valve’s natural frequency for a valve modulation of "10% in relation to 100 bar
pilot pressure is specified in MD 5114.
The valve damping can be calculated from the amplitude overshoot at resonant
frequency for values of less than 0.7. The valve damping for a valve modulation
of "20% in relation to 100 bar pilot pressure is specified in MD 5115.
Machine parameter MD 5113 with control bits has been introduced to allow spe-
cial valve features to be taken into account.
5113 VALVE_CONFIGURATION Cross reference: -
Valve configuration
Bit 0= 0: Directly-controlled valve
1: Pilot-controlled valve
Bit 2/Bit 1= 00: No fail-safe
01: Fail safe closed
10: Fail-safe open
11: -
Bit 3= 0: No differential circuit
1: Differential circuit
Bit4= 0: 7-pin connector
1: 12-pin connector
Related to:
HLA
Protection level:
3/3
Unit:
HEX
Default:
0
Minimum:
0
Maximum:
1
Data type:
UNS.WORD
Active:
Immediately
Special points to
be noted
4 Firmware Drive Functions
02.99

Siemens Sinumerik 840D Series Specifications

General

Axes	Up to 31 axes
Power Supply	24 V DC
Control Type	CNC
Interface	Ethernet, PROFIBUS
Display	TFT color display
PLC	Integrated PLC (programmable logic controller)
Operating Temperature	0°C to 45°C
Relative Humidity	Up to 95% (non-condensing)
Max. Number of Channels	Up to 10 channels