4.5 - GREEN MACHINE
™
- North America - Installation, Operation, Maintenance, & Troubleshooting Manual
Chapter 8: Troubleshooting
Page 148
8.8.1
Overfill Alarm Troubleshooting Steps
Steps
Procedures
1. An overfill may cause the vacuum pump to seize, which may cause the vacuum
pump motor to trip out on the thermal overloads.
2. If an Overfill Alarm Activates while a test is running:
•
The test will terminate.
•
The Fault and Alarm Screen is displayed and the Overfill Alarm box will display
RED.
•
An underground storage tank overfill is a serious situation that could damage
internal components in the GREEN MACHINE.
•
An overfill might happen if the delivery person fails to stop fueling, ignoring both
the overfill limit and the high-product limit.
•
VST has determined that overfill protection is needed to reduce the chance of
gasoline entering the GREEN MACHINE.
•
Below are the precautionary measures taken to protect the GREEN MACHINE
against an overfill situation:
•
The VST Control Panel will disable the GREEN MACHINE when the UST
level reaches the OVERFILL Alarm setting (OVERFILL: 90%) when the
relay contacts close at the Fuel Management System.
•
Eventually, as fuel is dispensed, the product would drop below the
OVERFILL Alarm threshold thereby resetting the relay and re-enabling
the GREEN MACHINE.
•
The Fuel Management System OVERFILL ALARM will not guarantee that
the GREEN MACHINE is protected from gasoline entering it.
3. The table below lists the VST recommended alarm settings for the tank level.
Position of Tank Alarm
Limits
VST Recommended Alarm
Settings
Overfill Limit
90%
