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System requirements
553-2691-100 Standard 8.00 August 1996
Description
The QSY22 (
) is a –48 to –150 V dc converter with 1.0 A output
capacity. The input (TB1-1) is fused at a 6.25 A (slow blow) and
accommodates the standard 48 V dc power from the system (see
The power ground to the system is connected through TB1-2. The logic
ground to the system logic ground bus bar is connected through TB1-3. The
outputs consist of the following:
— Seven separately fused –150 V dc feeds at connector J14 with a common
alarm bar and seven separately fused –150 V dc feeds at connector J15
with a common alarm bar. This provides –150 V dc power to the cabinet
in which the QSY22 is mounted. The fuses are rated at 0.25 A each and
are numbered 1 to 7 (from connector J14) and 10 to 16 (from connector
J15). If a fuse fails, a front panel light emitting diode (LED) lights,
indicating that failure has occurred. There is no system alarm to detect
loss of output.
— An additional –150 V dc output (TB1-4) fused at 1.33 A (fuse No. 8 on
the front panel fuse block), which provides power to the QBL16 Power
Distribution Unit on an adjacent PE cabinet.
Mounting
The unit mounts between the uprights where the terminal block (TBC) is on
a normal cabinet. To accommodate the power supply, the TBC is moved up,
if necessary, to facilitate the installation of the QSY22 unit (
power supply is then installed below the terminal block.
