Teledyne 9110AH - Nitrogen oxides analyzer - Manual (Page 162)

TELEDYNE Model 9110AH NO
X
Analyzer Operator Manual, 01620, Rev. F
9-46
Table 9-8: Power Supply Module Subassemblies
Module Description
Linear Power Supply
Board 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 9-5.
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.
Switching Power Supply The switching power supply supplies +15 VDC at 4 A to the PMT cooler
control on the Sensor Module and input power for the ozone generator.
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.
Switch Board 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 4-12 VDC loads.
The board also contains the instrument central grounding tie point. It
routes unswitched AC and DC power as needed. Connector P2 programs
the power transformers to take 115, 220, 230 or 240 VAC inputs
Power Transformers There are potentially 2 input power transformers in the PSM. The multitap
transformer T1 is in every M9110AH and supplies input power for the
Linear Power Supply board described above. A second transformer T2 is
added if 220, 230 or 240 VAC input is required. This transformer steps
down the 220/230/240 VAC to 115 VAC/50Hz for heaters and other
components. Input power selection is done via a programming connector
P2 which provides the proper connections for either foreign or domestic
power.
Circuit Breaker/Power
Switch 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.