Teledyne API – Model T700 Dynamic Dilution Calibrator
9.3.3. VALVE DRIVER PCA STATUS LEDS
CAL GAS
VALVE 1
CAL GAS
VALVE 2
CAL GAS
VALVE 3
CAL GAS
VALVE 4
Figure 9-4: Valve Driver PCA Status LEDS Used for Troubleshooting
Table 9-6: Valve Driver Board Watchdog LED Failure Indications
LED
D1
(Red)
(Watchdog Circuit)
LED
D3
Cal Gas CYL1
D4
Cal Gas CYL2
D5
Cal Gas CYL3
D6
Cal Gas CYL4
Purge Valve
D9
Diluent Valve
D10
06873B DCN6388
The Signal I/O submenu also includes VARS that can be used to turn the various input
gas valves on and off as part of a diagnostic investigation.
Function
Fault Status
Continuously ON
2
I
C bus Health
Continuously OFF
Table 9-7: Relay PCA Status LED Failure Indications
ACTIVATED BY SIGNAL
FUNCTION
I/O PARAMETER
CYL_VALVE_1
CYL_VALVE_2
CYL_VALVE_3
CYL_VALVE_4
PURGE_VALVE
Status
INPUT_VALVE
Status
WATCHDOG INDICATOR
Failed/Halted CPU
Faulty Mother Board, Valve Driver board or Relay
PCA
or
Faulty Connectors/Wiring between Mother Board,
Valve Driver board or Relay PCA
Failed/Faulty +5 VDC Power Supply (PS1)
DIAGNOSTIC TECHNIQUE
Valve should audibly change states and
LED should glow.
If not:
Failed Valve
Failed Valve Driver IC on Relay PCA
Failed Valve Driver Board
Faulty +12 VDC Supply (PS2)
Faulty Connectors/Wiring
Troubleshooting and Service
PURGE
VALVE
DILUENT
VALVE
Indicated Failure(s)
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