Fig.18-2:
Correct shield connection for DSUB and RJ-45 connectors
1
... Metallised or metallic housing
2
... Connect the shield to a large surface area
●
The use of pig tails for contacting the cable shield via plug pins is unsuit-
able. The inductivity of such pig tails represents high impedance resistance
for higher frequency interference; this means an apparent break in the
cable shield. Interference is then no longer diverted and works directly on
the inner lines.
Fig.18-3:
Insufficient contacting of a cable shield
1
... No pig tails
Shielding inside the control cabinet
In many cases a range of interference sources, such as servo drive modules,
transformers, contactors and relays, is present in the control cabinet. It is
therefore necessary to run the cable shield from the connector housing (control
cabinet) to the control (continuous connection from the handheld terminal to
the control). When using the appropriate connection box and a shielded cable
for the data line from the connection box to the control, the continuous, high
frequency compatible connection of the shield from the KeTop to the control
is guaranteed.
If for some reason a connection box cannot be used, the continuous connection
of the shielding on less critical interface types takes place by contacting the
connector housing with the control cabinet and inside the control cabinet by
contacting the shielding with the control cabinet (using shielding clips). The
smaller the distance between the contacting of the connector housing on the
Appendix: Electromagnetic Compatibility
KeTop T10
© KEBA 2014
Project engineering manual V1.02
76
Содержание Kemro KeTop T10
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