Motion Coordinator Technical Reference Manual
Installation 3-13
EMC Considerations
5) The MC206 should not be handled whilst the 24 volt power is connected.
As well as following these guidelines, any installation instructions for other prod-
ucts in the system must be observed.
Motion Coordinator MC216
When the Trio products are tested they are wired in a typical system configura-
tion. The wiring practices used in this test system must be followed to ensure the
Trio products are compliant within the completed system. A summary of the
guidelines follows:
1) The case of the modules should be earthed via their back panel. If the mounting
panel is painted an area of paint should be removed to ensure a good electrical
connection between the module and the cabinet.
2) If any IO lines are not to be used they should be left unconnected rather than
being taken to a terminal block, for example, as lengths of unterminated cable
hanging from an IO port can act as an antenna for noise.
3) Screened cables should be used for encoder, resolver and registration input feed-
back signals and for the demand voltage from the controller to the servo ampli-
fier if relevant. The demand voltage wiring must be less than 1m long and
preferably as short as possible. The screen should be connected to earth at both
ends. Termination of the screen should be made in a 360 degree connection to a
metallised connector shell. If the connection is to a screw terminal e.g. demand
voltage or registration input the screen can be terminated with a short pig-tail to
one of the screw locks of the D-type shell of the encoder connector.
4) Connection to the serial ports should be made with a Trio supplied cable. When a
Motion Coordinator is not connected to a PC the serial cable must be removed as
it will act as an antenna for electrical noise if it is left unterminated.
As well as following these guidelines, any installation instructions for other prod-
ucts in the system must be observed.
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