Teledyne API Model 200AH NOX Analyzer Instruction Manual, 06492, Rev. G2 9-46 Table 9-9: 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 M200AH 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.