ADTRAN Total Access 1500 Chassis 1180001L1 Installation And Maintenance Practice page 5

Frame Ground Connection
The frame ground terminal, located on the upper right
corner of the backplane (see
should be connected using appropriately sized wire. Use
a wire gauge that is at least the same gauge as the power
wiring.
To make the frame ground connection to the Total
Access 1500, perform the following steps:
1. Using the crimping tool, connect an appropriate
lug to each end of the appropriately sized wire.
2. Connect the ground wire from Total Access 1500
Frame ground terminal to the Equipment Rack
grounding screw.
3. Tighten the ground connection securely with a
straight-slot screwdriver.
Test Frame Ground Connection
To ensure a good ground, use a multimeter to check
continuity between the frame grounding lug and the
rack grounding strap at the top of the rack. Using a
ohmmeter, if applicable set to its the lowest resistance
range, place one lead on the rack's ground strap and the
other lead on the Total Access 1500 frame ground
terminal. The reading should be 1 or 2 ohms. Greater
readings should be investigated.
Power Connection
NOTE
Connect to a reliably grounded –48 VDC
source, which is electrically isolated from the
AC source.
NOTE
A readily accessible disconnect device, such as
a rackmount fuse and alarm panel that is
suitably approved and rated, should be incor-
porated in the fixed wiring.
Power connections use a block, labeled
the upper right side of the backplane (see
Figure 5). The terminals are on 0.375 inch centers and
allow for wire gauges up to 12 AWG. The Frame
Ground terminal routes to mechanical contact points
and provides an electrical connection to the chassis
metalwork. The power bus and frame ground route to all
the cards in the shelf.
61180001L1#S-5D
Figure 4 and Figure 5),
, located on
TB1
Figure 4 and
Issue 4, February 2009
The number of shelves that can be placed in a 7-foot
central office rack depends on the type of service
deployed and the number of access modules in the shelf.
After connecting and checking the ground to the Total
Access 1500 shelf, connect power to the shelf. Check to
make sure your power source is providing the correct
power and polarity to the shelf.
The following steps provide instructions on how to
connect power to the shelf.
1. Determine which fuse pairs are to supply power to
the Total Access 1500 shelf.
2. Remove the fuses from the A and B slots for the
pair.
3. The power terminal is labeled
lengths of appropriately sized wire to reach from
the terminals on the fuse and alarm panel to the
power terminals on the Total Access 1500 shelf.
4. Using the crimping tool, connect an appropriate
lug to each end of the wires.
5. Using a screwdriver appropriate for the fuse and
alarm panel terminals, and a straight slot or phillips
screwdriver for the Total Access 1500 power
terminal, connect the ends of one wire between the
"A" CO –48 VDC supply and the
terminal on the Total Access 1500 backplane.
6. Connect three more power wires, connecting the
"A" CO –48 VDC return with
CO –48 VDC supply with
CO –48 VDC RTN with
. Cut four
TB1
–48V PRI IN
; "B"
–48V PRI RTN
; and "B"
–48 V SEC IN
.
–48V SEC RTN
5