System requirements
Page 27 of 48
Message Center Description and operation
QSY19 Power Supply
The QSY19 Power Supply, which is no longer available (
early version power supply used to power the Message Waiting lamps. It can
be mounted in the QCA8, QCA23, QCA28, and QCA37 cabinets in the same
way as the QSY22. The inputs and outputs are fused in the same way as the
QSY22; however, there is no alarm LED on the front panel.
The –48 V dc from the system (
) is connected to the TB-1 terminal
of the QSY19. The power ground connection to the system is made using pins
8–15 of P14. The –150 V dc output for the QBL16 on the QCA7 cabinet is
taken from TB1-3. A load strap is connected from TB1-2 to TB1-3.
The installer must ensure that the load strap (
connecting –48 V dc power to the QSY19 power supply; otherwise the power
supply could be damaged. If a field installation of the load strap is required,
16 AWG red stranded wire is recommended.
QBL16 Power Distribution Unit
Power distribution in the associated PE cabinet is done by the QBL16 Power
Distribution Unit (
). The –150 V dc input for the QBL16 comes from
the QSY22/QSY19 through a QCAD2 10 AWG power cable that connects to
the TB1 terminal of the QBL16 (
). The power is divided into one lead
for each shelf, each protected by one fuse (0.18 A) in the QBL16. This power
goes out to the shelves through the P14 connector into which plugs the cable
from the cabinet wiring harness.
Mounting
The QBL16 is mounted between the center uprights in the bottom of the
QCA7 cabinet in the same relative location as the power unit.
