Diagnostics
Automatic Control and Runtime Fault Alarm
Under automatic control, vapor pressure readings are compared to user programmable thresholds to determine
the appropriate Pressure Management Device (PMD) state. When the PMD is off and the OVERPRESSURE
LIMIT is exceeded, an internal relay is enabled and remains so until the pressure drops below the TURN OFF
VAPOR PROCESSOR threshold. Automatic control is the default mode.
Manual control
If PMC mode is Manual, the diagnostic menu allows the PMD to be directly turned on/off through the relay. This
feature is to support unit operational testing without waiting for the pressure to hit limits. The current UST ullage
space vapor pressure will also be available through the diagnostic menu. The VC1 RS232 command allows for
remote control of the PMD when the PMD control is manual. Note: If the PMD is on and the PMC mode is
Automatic, changing the control mode to Manual mode will turn the PMD off.
PMC Diagnostic Menu
Figure 16. PMC Diagnostic Menus
PMC VERSION: 01.00
PRESS <STEP> TO CONTINUE
S
S
VAPOR PRESSURE
INCHES H2O: -x.xxx
S
VAPOR PROCESSOR MODE
AUTOMATIC
<CHANGE> selects
AUTOMATIC (default) / MANUAL
S
VAPOR PROCESSOR STATE
VP STATE: OFF
If VP mode = MANUAL, and relay
configured Then, <CHANGE>
selects ON / OFF
S
HYDROCARBON SENSOR
HC SENSOR: XX.XXX%
S
CLEAR TEST AFTER REPAIR
PRESS <ENTER>
PROCESSOR STATUS TEST
PRESS <ENTER>
S
CLEAR TEST AND LOG
ARE YOU SURE? NO
S
pmcfig4.eps
Prints out a copy of the
PMC Diagnostic report.
See example at right.
C
F
P
S
T
Change
E
Enter
Function
M
Mode
Step
Tank/Sensor
Key press
sequence
Repress until
desired message
appears in display
Key Legend
1
2
PMC DIAGNOSTICS
----------------------
PMC VERSION: 01.00
VAPOR PROCESSOR MODE
AUTOMATIC
VAPOR PROCESSOR STATE
VP STATE ON
PMC DIAGNOSTIC
PRESS <STEP> TO CONTINUE
DIAG MODE
PRESS <FUNCTION> TO CONT
M
P
F
Section 16
Pressure Management Control
16-19
