Heater Control; Power Distribution Board Status Leds And Watch Dog Circuitry; Figure 9-5. Heater Control Loop Block Diagram; Figure 9-6. Status Led Locations - Power Distribution Board - Teledyne T750 User Manual

Heater Control

The power distribution board controls the DC heaters related to the O
photometer.
(
e.g. photometer sample gas temp.;
photometer UV lamp temp.; O

Power Distribution Board Status LEDs and Watch Dog Circuitry

LEDs located on the calibrator's power distribution board (Figure 9-6) indicate the status
of the calibrator's heating zones and some of its valves; included is a general operating
watchdog indicator. Table 9-1 shows the states of these LEDs and their respective
functionality. Not all LEDs are used.
Figure 9-6. Status LED Locations – Power Distribution Board
083730750B DCN8606
Thermistor(s)
generator
3
lamp temp.; ect.)
RELAY PCA
DC
Control
Logic
O Generator
3
Lamp Heater

Figure 9-5. Heater Control Loop Block Diagram.

MOTHER BOARD
A/D
Converter
(V/F)
CPU
PHOTOMETER
Lamp Heater
generator and
3
165