•
Plate, Face, 6A2- *
*Refer to Table
C
for color suffix.
INSTALLING
3.04
Be careful when unpacking to prevent damage
to components.
3.05
Install the 7A Communication System as
follows:
A. 570A KSU
(1) Remove cover from KSU.
(2) Use the template provided to locate the
fastener holes at the selected location.
(3) Install appropriate fasteners.
(4) Hang KSU on fasteners.
(5) Connect the circuit ground to an approved
ground. For circuit ground a No. 14 gauge
wire should be attached from the LOC GRD
terminal of the power unit to an approved local
ground. If a 3-wire grounded receptacle is not
available,
a frame ground
(No. 14 gauge wire)
must be connected from the case or frame of
the power unit to an approved local ground.
Caution:
Do not strap the circuit ground
to the frame or case of the power unit.
The suscep tibility of surge damage to
semiconductor components used
in
400-series
KTUs requires that grounding procedures
be followed. Properly grounded installations
will minimize service failures tha t can
result from surge voltages or differences
between dissimilar grounds.
Refer to
Section 518-010-105 for detailed information
on grounding key systems.
(6) Unlatch and open carrier assemblies.
(7) Terminate the incoming CO/PBX lines on
connecting block 3 as shown in Fig. 25.
(8) Terminate the station cables.
Cut down
the A25B connector cables on connecting
blocks 3, 4, and 5 as shown in Fig. 26. Intercom
station code 0 (attendant station) is terminated
on column G of connecting block 3. Intercom
ISS 3, SECTION 5 1 8-450- 1 00
station code 3 is terminated on column H of
connecting block 3, and station codes 4 through
19 are terminated on columns A through H on
connecting blocks 4 and 5 as shown in Fig. 26.
A direct cable run to any station may not
exceed 667 feet of 24-gauge cable.
(9) Place or remove option straps.
(10) Install power cord. Do not connect to ac
source at this time.
(11) Close and latch carrier assembly.
(12) Install KTUs necessary to provide required
services. See Fig. 6 for KTU connector
arrangement.
I ST
CO/PBX
LINE
2ND
CO/PBX
L I NE
3RO CO/PBX
(
L
I
NE
HH CO/PBX
(
L
I
NE
5TH CO/PBX
[
LINE
6TH CO/PBX
LINE
7TH CO/PBX
L I NE
T
( I )
R I
T ( 2 )
R (2 )
T
(3 )
T
( 4 )
R (4 )
T
(5)
R ( 5 )
T ( 6 )
R 6
T ( 7 )
R ( 7 l
P /0 CONNECTING BLOCK 3
B
C D
E
0 0
0
0
�37
0
0
�
0 0
<>-<>
40
: I*
0--040
<>-<>
0 0
0
0
0
0
<>-<>
0 0
0
0
45
0 0
<>-<>45
0
0
0
0
0 0
0
0
0
0
�
0 0
0
0
0 0
0
050
*
FACTORY PROVIDED STRAP ON INSTALLER
S I D E OF CONN
BLK
Fig. 25-Connections for Incoming CO/PBX Lines
B. Satellite Wiring Plan
3.06
The 7 A System is designed for "Home Run"
cabling (direct cabling) from each telephone
set to the KSU. Where it is more practical to
serve a group of stations from a secondary location,
a "satellite" wiring plan can be used. The satellite
wiring plan is a connecting block arrangement for
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