Siemens HiPath 3000 V3.0 or later Gigaset M1 Professional, Руководство по обслуживанию, Страница: 508 / 1202

Installing HiPath 3000
P31003-H3560-S403-54-7620, 09/05
4-30
HiPath 3000 V6.0, HiPath 5000 V6.0, Provisional Service Manual
inst_h3.fm
Installing HiPath 3800
Note on possible ground loops
4.2.4.5 Checking the Grounding
Procedure
Perform the tests in the table below to ensure that the system is properly grounded before star-
tup.
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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, ex-
pansion 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