Kuhnke Electronics Instruction Manual
Kuhnke Electronics Instruction Manual
Kuhnke Electronics Instruction Manual
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3.3 Power Supply<br />
3.3.1 Earth<br />
left side wall<br />
Hardware<br />
The metal housing has to be connected to earth. Use the<br />
earth conductor located on the left side wall.<br />
� Earth conductor<br />
Cross section: min. 2.5 mm²<br />
Length: as short as possible<br />
� Interfacing<br />
Flat plug 6.3 x 0.8 mm<br />
� Function<br />
The earth conductor serves as operative earth<br />
(special case: relay module � E 409 GB).<br />
The +24 VDC and 0 V power supply connectors have<br />
an internal (by spring-actuated contacts on the PCB)<br />
capacitive connection to the housing which also<br />
attaches them to earth. Line-conducted HF<br />
interference is bled off into the ground.<br />
The PROFIBUS plug connector housing directly<br />
connects to operative earth which is where the cable<br />
shield is attached also.<br />
This earth conductor is no protection against high contact<br />
voltage. To provide sufficient protection, supply the<br />
devices with properly separated low voltage.<br />
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