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SS7G21 and SS7G22 Signaling Servers Hardware Manual Issue 7
• Replacement of Power Supply Module in AC Products
The general actions required, such as (un)latching, removal and insertion of modules, are described in
Section 9.2.6.
The connections are unaffected by AC Module replacement.
If replacing a failed module, it is possible that the relevant fuse may need replacement. It should be
possible to determine if this is necessary from the LED indication on the new module.
9.2.1 Safety Ground Studs, Conductor Installation
Two 8-32 UNC safety ground studs are provided for attachment of a safety ground conductor to the product.
These are for use only with DC powered product. Connection of a safety ground conductor should only be
performed by a qualified service technician.
When connecting the safety ground conductor, ensure that it complies with the WARNING – IF DC POWER
SUPPLIES ARE INSTALLED, sub-section GROUNDING THE RACK INSTALLATION in Chapter 7, “Warnings and
Cautions”.
The safety ground conductor must be a minimum 14AWG. To connect the safety ground conductor to the
safety ground studs with a two-hole crimp terminal lug:
1. Place an 8-32 UNC nut on one safety ground stud and tighten to 10 in-lb.
2. Place the safety ground conductor terminal lug on the safety ground studs.
3. Place another 8-32 UNC nut on the same safety ground stud so that the safety ground conductor
terminal lug is between the two nuts and tighten the second nut to 10 in-lb.
When installing the product in locations other than telecommunications centres, ensure that the safety
ground conductor is less than 3 metres in length.
The two-hole crimp terminal lug must have a hole spacing of 5/8-inch, and must suit the conductor size in
use, for example, Panduit
®
part number LCD8-10A-L, which suits 8AWG conductor.
9.2.2 DC Power Supply Module, Initial Connections
For DC powered products, each Power Supply Module is provided with its own DC power input terminal block,
mounted directly on the rear of the module. Connection to a DC source should only be performed by a
qualified service technician. See also Section 9.2.1, “Safety Ground Studs, Conductor Installation” on
page 51. See Figure 13 for the location of the terminal block on DC Power Supply Modules.