111
10
Appendix
10
Appendix
10.1
Wiring According to EMC
10.1.1 Shields Connection
All cables from and to the VMS must be shielded (with the exception of the 230 V cable). Con-
nect the shielding to PE by the shortest possible route.
10.1.2 PE Busbar
On the back of the unit two bars are fitted left and right parallel to the terminal strips. All screen-
ing is to be laid up to those bars. Although this bar already has a connection to PE via the
housing, the fault leakage conduction is improved if a separate, low-impedance PE wire is laid
to each of these in addition.
10.1.3 Control Cabinet Wiring
The low-voltage cables from and to the VMS should not run in parallel to the power electronics'
in and out conductors in one cable duct.
Frequency converter cables and switches/contacts carrying high inductive or capacitive firing
rates are particularly critical. Therefore, avoid routing parallel to the drive cables of solenoid
valves, ignition transformers, servo motors and similar devices.
Although this device exceeds all relevant EMC standards in some respects, suitable wiring is
essential to ensure that the entire system operates smoothly in all conditions.
Shielding of supply lines out of the field:
The best method of connecting supply lines out of the field (e.g. potentiometer line) is to con-
nect them directly (without additional terminals).
If you need additional terminals, you must connect the shielding beside this terminals
Avoid long distances in the cable duct.
Right:
shielding terminal
connection terminal
Wrong:
connection terminal
shielding terminal
Summary of Contents for VMS 4
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