5 Electrical connections
5.5.1 External 24V supply
100 A 3HAC 16245-1
Section 5.5: Supplies
5.5.1 External 24V supply
When is an exter-
nal supply recom-
mended?
An external supply is recommended to make use of the advantages offered by the galvanic
insulation on the I/O units or on the panel unit.
An external supply must be used in the following cases:
• When the internal supply is insufficient
• When the emergency stop circuits must be independent of whether or not the robot
has power on, for example.
• When there is a risk that major interference can be carried over into the internal 24V
supply.
How to connect
the external sup-
ply
The external supply neutral wire must be connected to the chassis such that the maximum
permitted potential difference in the chassis earth is not exceeded. For example, a neutral wire
can be connected to the chassis earth of the controller, or some other common earthing point.
Technical data
Potential difference to chassis earth Max. 60 V continuously
Max. 500 V during 1 minute
Permitted supply voltage I/O units 19 VDC - 35 VDC incl. ripple
Panel unit 20.6 VDC - 30 VDC incl. ripple
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