98
Teledyne API T500U CAPS NO
2
Analyzer with NumaView™ Software
083730510A DCN8172
R
ELAY
PCA
S
TATUS
LED
S
LEDs that remain continuously on or off (not blinking) indicate a default state for their
respective components as described in Table 5-5
D7 (Green) – Optional Zero/Span Valve
D11 (Green) – Optional Dual Span Select Valve
D12 (Green) – Optional Pressurized Span Shutoff Valve
D3 (Yellow) NO
2
NO Converter Heater
D5 (Yellow) – Optional Internal Span Gas Gen Heater
D8 (Green) – Optional Sample/Cal Valve
D1 (RED)
Watchdog Indicator
D2 (Yellow) Reaction Cell Heater
D9 (Green) – AutoZero Valve
D10 (Green) – NO/NO
x
Valve
D13 (Green) – Optional Pressurized Zero Shutoff Valve
Figure 5-9. Relay PCA Status LEDS Used for Troubleshooting
Table 5-5. Relay PCA Watchdog and Status LED Failure Indications
LED
COLOR
FUNCTION
INDICATED FAILURE(S)
D1
Red
I2C bus Health
(Watchdog Circuit
Failed/Halted CPU.
Faulty Motherboard, Touchscreen or Relay
PCA.
Faulty Connectors/Wiring between
Motherboard, Touchscreen or Relay PCA.
Failed/5 VDC Power Supply (PS1).
LED ROW 1
D2
Yellow
Reaction Cell heater
Heater broken, thermistor broken
D3
Yellow
NO
2
converter heater
Heater broken, thermocouple broken
D7
Green
Zero/Span valve status
Valve broken or stuck, valve driver chip broken
D8
Green
Sample/Cal valve status
Valve broken or stuck, valve driver chip broken
D9
Green
Auto-zero valve status
Valve broken or stuck, valve driver chip broken
D10
Green
NO/NO
x
valve status
Valve broken or stuck, valve driver chip broken
LED ROW 2
D5
1
Yellow
Internal span gas generator
perm tube heater
Heater broken, thermistor broken
D11
2
Green
Dual span select valve
Valve broken or stuck, valve driver chip broken
Summary of Contents for T500U
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