Checking The Grounding - Siemens HiPath 5000 Service Manual

inst_h3.fm
Installing HiPath 3000
Installing HiPath 3750, HiPath 3700
Note on possible ground loops
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.
4.3.4.6

Checking the Grounding

Procedure
Perform the tests in the table below to ensure that the system is properly grounded before star-
tup.
Step
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 3700.
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.
2. Check the ohmic resistance between the individual sys-
tem parts (basic cabinet, expansion cabinets, patch pan-
els).
Prerequisite:
HiPath 3700 is not yet connected to the low-voltage net-
work via the power cable.
4-138
Activity
HiPath 3000 V6.0, HiPath 5000 V6.0, Provisional Service Manual
Target
< 10 ohms
< 1 ohm
P31003-H3560-S403-54-7620, 09/05