Franklin Fueling Systems TS-DTU Noise Suppression Cables TS-DRK - Manual (Page 4)

4
Alarm Examples
Examples NOT indicating a need to replace the DTU Cables
1.
Multiple “Remote DTU is offline” alarms occur at the same time (Refer to Figure 1).
By noting the time all the Remote DTUs went offline, it is clear that these were caused by some power loss either
manually or the console shutdown the dispensers (Figure 5).
Figure 5: DTU Offline Alarms, not an indication of needing new cables
2. ISD alarm 1 to 2 minutes before the “Remote DTU is offline” alarm occurs. (Refer to Figure 2).
The result of an ISD Vapor Collection Failure alarm is that the console shuts off power to the dispenser. In Figure
2, Dispenser 3 generated an VRM Failure alarm for both its fueling point and shutdown the dispenser. A minute
and half later, “Remote DTU is offline” alarm was generated because the DTU did not have power.
Figure 6: DTU Alarm Caused by VRM Collection Alarm
3. Console DTU Alarm was generated minutes before a DTU alarm
If the Console DTU went into alarm near the same time, within a few minutes of the Remote DTU is Offline, then
the alarms was from the Console DTU problem.
Examples indicating a need to replace the DTU power cables
1. Repeated Remote DTU alarms at different times (> 1-3 minutes)
Remote DTU alarms that occur with the same DTU
Figure 7: DTU Alarms Separated by Time
2. Remote DTU Alarms only occur at night time
Finding a trend that shows the “Remote DTU is offline” alarm usually occurs at night or the same time certain
lights are on may mean some interference. If possible try recording the DTU quality over a 24-hour period to see if
the DTU drops during the nighttime hours.