Power Supply Module; Table 9-7: Power Supply - Teledyne 6400A Instruction Manual

TAI Model 6400A SO

9.3.5 Power Supply Module

The Power Supply Module consists of several subassemblies described in Table 9-7 below.
Table 9-7: Power Supply Module Subassemblies
Module
Linear Power Supply Board
Switching Power Supply
Switch Board
Power Transformers
Circuit Breaker/Power
switch
Analyzer Operator Manual, 02164, Rev. G
2
Description
The linear power supply board takes multiple voltage inputs from the
power transformer and produces +5, +15, -15, +12 VDC outputs. The
outputs are routed to two external connectors, P2 and P3. See Figure
9-4. The + 5 is used for operating the CPU. The ± 15 is used in
several locations for running op-amps and IC's. The + 12 is used for
operating fans and valves.
The switching power supply supplies + 15 VDC at 4 A to the PMT
cooler control on the Sensor Module. The output is made available
through J10 on the Switch Board. There is a load resistor on the
Switch Board to keep the output stable when little current is required
from the supply.
The Switch Board has many different functions. It takes logic signals
from the V/F board and uses them to switch 4-115 VAC and 4-
12VDC loads. The board also contains the instrument central
grounding tie point. It routes unswitched AC and DC power as
needed. Connector J2 programs the power transformers to take 115,
220, or 240 VAC inputs
There are potentially 2 input power transformers in the instrument.
The multitap transformer T1 is in every 6400A and supplies input
power for the Linear Power Supply board described above. A second
transformer T2 is added if 220 or 240 VAC input is required. Input
power selection is done via a programming connector P2 which
provides the proper connections for either foreign or domestic power.
The front panel contains a combination circuit breaker - input power
switch. It is connected to the PSM through J6 on the Switch Board. If
an overload is detected the switch goes to the OFF position.
Switching the power back on resets the breaker also.
9-45