Installing HiPath 3000 Nur für den internen Gebrauch
A31003-H3590-S100-7-7620, 06/2012
4-30 HiPath 3000/5000 V9, Service documentation
inst_h3.fm
Installing HiPath 3800
Note on possible ground loops
4.1.4.5 Checking the Grounding
Procedure
Perform the tests in the table below to ensure that the system is properly grounded before star-
tup.
>
To avoid ground loops from remotely operated devices (V.24 system peripherals),
the devices should be connected to the same low-voltage network (sub-distribution
board) if possible.
If the building floor plan does not permit this, you may need a line driver to isolate
the external devices in the event of a malfunction.
Step Activity Target
1. Check the ohmic resistance of the ground connection to
the 19-inch cabinet:
Perform measurement between the PE (protective
earth) on a socket in the internal installation (at the sys-
tem’s installation site) and HiPath 3800.
Prerequisites:
● No device in the 19-inch cabinet is connected to the
low-voltage network via the power cable.
● The system’s separate grounding (basic cabinet,
expansion cabinet, patch panel) and the grounding
of the 19-inch cabinet are connected.
< 10 ohms
2. Check the ohmic resistance between the individual sys-
tem parts (basic cabinet, expansion cabinet, patch pan-
el).
Prerequisite:
HiPath 3800 is not yet connected to the low-voltage net-
work via the power cable.
< 1 ohm
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