160 Theory of Operation 083730300A DCN8101
6.4.4.4 IR SOURCE
The relay board supplies a constant 11.5VDC to the IR Source. Under normal operation
the IR source is always on. Status LEDs
Eight LEDs are located on the analyzer’s relay board to show the current status on the
various control functions performed by the relay board. They are listed on Table 6-16.
Table 6-16. Relay Board Status LEDs
LED COLOR FUNCTION STATUS WHEN LIT STATUS WHEN UNLIT
D1 RED Watch Dog Circuit
Cycles On/Off every 3 seconds under direct control of the analyzer’s
CPU.
D2 YELLOW Wheel Heater HEATING NOT HEATING
D3 YELLOW Bench Heater HEATING NOT HEATING
D4 YELLOW Spare N/A N/A
D5 GREEN
Sample/Cal Gas Valve
Option
Valve Open to CAL GAS FLOW Valve Open to SAMPLE Gas Flow
D6 GREEN Zero/Span Gas Valve Option Valve Open to SPAN GAS FLOW Valve Open to ZERO GAS FLOW
D7 GREEN Shutoff Valve Option Valve Open to CAL GAS FLOW
Valve CLOSED to CAL GAS
FLOW
D8 GREEN IR SOURCE Source ON Source OFF
Figure 6-15. Location of relay board Status LEDs
To Next Page
Loading...