Signal Connection to External Devices
▲
■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■
DS1104 Hardware Installation and Configuration March 2004
I
■■■■■■■■■■■■■
▼
150
■■■■■■■■■■■■■■■
▼
If a cable contains unused leads, connect them to signal return
(ground) lines at both ends to lower the inductance of the ground
path between the dSPACE system and the sensor/actuator.
Star ground
configuration
In a star ground configuration, ground loops are of no concern, if the
signal return (ground) lines within the external devices are not
connected to protective ground.
Always connect all signal return (ground) lines at both ends of a cable,
i.e. board connector and sensor/actuator.
Shielding
The best shield is a low-inductance conductive barrier surrounding the
complete setup of the device, cable and system, keeping in everything
inside and keeping out everything outside (faraday cage). Low
resistance, and most especially low inductance, are the key to a good
shield.
EMC radiation and immunity are mostly affected by the outer cable
shield. Individual lead shielding has only a minor effect if a common
outer shield is present. Individual shielding is only necessary to reduce
crosstalk.
Cabling
For cabling you should use shielded, twisted pair cables. The inner
twisted-pair leads are used for the signal line and the return line
(ground line). The return line should be connected to the ground pins
of the respective board connector.
Ideally, each signal should be twisted with its return line so that any
electromagnetic fields cancel one another.
Using the encoder interface with differential signals, the PHI90 line
should be twisted with PHI90, PHI0 with PHI0 et cetera.
Connecting shield to
the dSPACE system
Use a metal shell connector to the dSPACE board connector and
connect the shield to the connector shell so that shield, connector
shell and system enclosure form a closed shield surrounding all
electronics. Use a large area connection and avoid pigtails.
Summary of Contents for CLP1104
Page 6: ...Contents DS1104 Hardware Installation and Configuration March 2004 I 6 ...
Page 20: ...Safety Precautions DS1104 Hardware Installation and Configuration March 2004 I 20 ...
Page 118: ...Mapping of I O Signals DS1104 Hardware Installation and Configuration March 2004 I 118 ...
Page 162: ...Data Sheets DS1104 Hardware Installation and Configuration March 2004 I 162 ...
