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Page 36 of 48
Power supply installation
553-2691-100
Standard 8.00
Procedure 1
Installing the QSY22 Message Waiting Power Supply
1
Set the input switch on the QSY22 power unit to OFF.
2
Remove the two flat-head screws securing the plastic shield over TB1
of the QSY22 unit.
3
Disconnect the lead assembly supplied with the QSY22 unit.
4
Position the QSY22 unit in the cabinet, and secure it with four
mounting screws
5
Connect the BLACK lead (with two lugs) between the TB1 terminal 3
of the QSY22 unit and the ground bus in the center of the cabinet.
6
Connect the other BLACK lead (lug end) to the TB1 terminal 2 of the
QSY22 unit and the ground terminal (1) of the TBC.
7
If the Message Waiting shelves and harness are provided in this
cabinet, connect the P14 connector of the cabinet harness to
connector P14 of the QSY22 unit.
8
Connect the RED lead (lug end) to the TB1 terminal 1 of the QSY22
unit and the other end to the –48 V terminal (3) of the TBC.
This is a LIVE connection. Be careful when making this connection.
Also, a short to ground could cause a complete loss of power to this
cabinet.
9
Set the INPUT switch of the QSY22 to ON.
10
Test for –150 V at TB1 terminal 4.
11
If a QBL16 Distribution Box is to be provided in a companion QCA7
cabinet, perform the steps of
this chart.
12
Secure the plastic shield in place over TB1 with two flat-head screws.
August 1996
(Figure
1).
CAUTION
Electrical Hazard
Procedure
2, then return to Step 12 of
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