Teledyne T360, Operation Manual, Page: 216 / 358

Principles of Operation Teledyne API Model T360/T360M Operation Manual
214
Table 7-2: Relay Board Status LED’s
LED COLOR FUNCTION STATUS WHEN LIT STATUS WHEN UNLIT
D1 RED Watchdog 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
STATUS LED’s
DC VOLTAGE TEST
POINTS
RELAY PCA
Figure 7-17: Location of relay board Status LED’s
7.4.5.6.
I
2
C
WATCH DOG CIRCUITRY
Special circuitry on the relay board monitors the activity on the I
2
C bus and
drives LED D1. Should this LED ever stay ON or OFF for 30 seconds, the
watchdog circuit will automatically shut of all valves as well as turn off the IR
Source and all heaters. The GFC wheel motor will still be running as will the
Sample Pump, which is not controlled by the relay board.
07272B DCN6552