System Manual Modular Systems 7 Start-Up
HI 800 191 E Rev. 2.02 Page 53 of 114
7.2.6.2 Earthing Connections
All HIMatrix devices have labeled screws for earthing. The wire cross-section for the connection
to the screw is 2.5 mm
2
. The earth wires must be as short as possible.
The earthing screw is located on the front, left side of the earth grid and is labeled with the
earthing symbol.
These measures ensure a reliable earth ground and compliance with the current EMC
requirements for HIMatrix systems.
7.2.6.3 Shielding
The shielding must be connected to the HIMatrix system and the sensor or actuator housing
and earthed on one end to the HIMatrix system side to form a Faraday cage.
In all other devices, the shielding must be positioned in the controller housing, terminal box,
control cabinet, etc.
The shield clamp must not be used as a strain relief for the connected cable.
7.2.6.4 EMC Protection
Windows in the enclosure in which the HIMatrix system is installed are permitted.
Increased EMC interferences outside the standard limit values require appropriate measures.
For improved EMC, earth the housing.
The connection to the next grounding point must be as short as possible to achieve a low
earthing resistance.
7.2.7 Connecting the Supply Voltage
The contact is electrically connected using a detachable 3-pole connector located on the front
plate of the power supply units. The connector can accept wires of up to 6 mm².
Power supply L- (24 VDC ground)
Table 25: Connectors for Operating Voltage
If shielded wires are used for the power supply, the shielding must also be connected to the
power supply connector via the earth contact.
The power supply unit must meet the IEC/EN 61131-2 requirements and comply with the low
voltage directives SELV (Safety Extra Low Voltage) or PELV (Protective Extra Low Voltage).
Check proper polarity, voltage and ripple prior to connecting the operating voltage 24 VDC.
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