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Communications interface, Figure 10-16, Power distribution block diagram – Teledyne 9110EH - Nitrogen Oxides Analyzer User Manual

Page 200

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Theory of Operation Model 9110EH Instruction Manual

right corner of the front panel and back to the relay board, which carries the switching

power supplies.

AC line power is stepped down and converted to DC power by two switching power supplies,

one for +12 VDC (5 A) for various valves and the TEC, and a second supply that provides
+5 VDC (3 A) and ±15 VDC (1.5/0.5 A) for logic and analog circuitry as well as the ozone

generator. All AC and DC Voltages are distributed through the relay board. A 5 ampere
circuit breaker is built into the ON/OFF switch. In case of a wiring fault or incorrect supply
power, the circuit breaker will automatically turn off the analyzer. Under normal operation,

the M200E draws about 1.5 A at 115 V and 2.0 A during start-up.

Figure 10-16:

Power Distribution Block Diagram

CAUTION

Should the power circuit breaker trip correct the condition causing

this situation before turning the analyzer back on.

10.3.7. Communications Interface

The analyzer has several ways to communicate with the outside world as shown in Figure
10-17. User
s can enter data and receive information directly through the front panel keypad

and display. Direct communication with the CPU is also available through the analyzer’s RS-
232 and RS-485 ports. The analyzer can also send and receive different kinds of information

186 M9110EH Rev 0