Dimensioning the voltage infeed
Observe the maximum currents when dimensioning the voltage supply. The operating voltage allowed
has to be applied directly to the device.
The voltage must also not be exceeded if:
• there are variations in line voltage, e.g. caused by different loads of the mains
•
there are varying load states, such as short-circuit, normal load, lamp load or no load
Connecting the reference conductor to the protective conductor
If the reference conductor 0 V (U
L
, U
P
) is connected to the protective conductor system, this connection
has to be arranged at a central place (e.g. at the load power supply unit). Hence, the supply current
circuit is a PELV circuit.
10.5.4
Grounding
NOTICE
Failure due to insufficient grounding
An optimum grounding is required to impede possible interferences from the
control and to discharge them to the ground.
Functional earth
Only the functional earth (FE) is used for the device. The functional earth is only used to
discharge disturbances. For individuals, the functional earth is not intended as protection
against electric shock.
The control is grounded via the support rail. The support rail, on which the control is mounted, has to
be mounted to a grounded metal carrier, e. g. the rear panel of the control cabinet.
The control is provided with FE springs (metal clips) at its bottom side creating an electric connection
to the support rail while mounting.
If necessary, provide the support rail with a separate ground connection.
Potential equalization
Potential equalization acc. to DIN VDE 0100 part 540 has to be provided between the system parts
and the voltage supply.
10.5.5 Shielding
NOTICE
Failure due to
insufficient shielding
Provide sufficient shielding.
The shielding reduces any effects of interferences on the system.
Observe the following when shielding:
•
Fasten the shielding as extensively as possible
• Ensure proper contact between connector and terminal
• Avoid damaging or squeezing conductors
Mounting, dismounting and electric installation
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