X251 And X252 Pressure Sensors To Sense The Pressure At The Shutoff Valve - Siemens SINAMICS S120 System Manual

To connect the pressure sensors on the A and B sides to the cylinder, use two-line
SIMODRIVE cables with article number 6FX8002-2BA20-.... With these cables, the two
sensor lines connected to the SUB-D connector have the same length when supplied.
Note
Connector type
The connector used must establish a continuous shield connection between the cable shield
and the metal housing of the pressure sensor. Even for connectors with metal housing, the
shield connection is not always continuous for all types.
• Ensure that there is a shield connection available.
• Observe the "Danger to life through electric shock due to unconnected cable shields"
note in Chapter "Fundamental safety instructions (Page 15)".
6.2.5

X251 and X252 pressure sensors to sense the pressure at the shutoff valve

You can connect 2 additional pressure sensors to the HLA module to evaluate central
pressure sensors. For instance, you can use the pressure sensor inputs for the following
applications:
● Outputs of two shutoff valves (axial assignment, axis 1 and 2)
● Measuring the pressure before and after the central shutoff valve when using a common
shutoff valve
2 sensing channels X and Y are available. The input for channel X is only connected at
connector X251. If 2 separate cables are used for the pressure sensors, then the input for
channel Y is connected at connector X251 (for two-line cables 6FX8002-2BA20-...) and in
parallel, at connector X252. Separate cables are used, e.g. when using one shutoff valve for
each axis, therefore requiring different cable lengths (new cable 6FX8002-2BA21-...).
The correct logical assignment is not fixed, and must be realized in the software or must be
appropriately parameterized.
NOTICE
Risk of a short-circuit at the signal outputs
If you simultaneously use 3 pressure sensors at interfaces X251 and X252, this will result in
a short-circuit at the signal outputs of the pressure sensors.
• Only connect a maximum of 2 pressure sensors. A 2nd pressure sensor can be
Hydraulic Drive
System Manual, 04/2015, 6SL3097-4BA00-0BP1
alternatively connected at interface X251 or X252.
Hardware
6.2 Interfaces
209