Basler Electric DGC-2020 - Manual (Page 617)

 SPN 3703 (Diesel Particulate Filter Status) is received with a value of 011
(regeneration is needed – highest level)
The pre-alarm text is SOOT LVL EXT HI.
The DPF stop symbol, shown to the right, accompanies the text
when the pre-alarm appears on the DGC-2020 front panel. If the
DPF soot level reaches the most severe level, the engine ECU may
shut the engine down, preventing it from running, or allow it to run,
but at a reduced power level. The DGC-2020 only indicates a pre-
alarm, it does not prevent the engine from running or cause
operation at a reduced power level. However, the operator should
be aware that the engine ECU or after treatment system may cause
such behavior.
Exhaust After Treatment Systems (EATS)
In order to meet Tier 4 emission requirements, some engine manufacturers are adding Exhaust After
Treatment Systems (EATS) which treat the engine exhaust within the exhaust system to reduce
particulate matter and harmful contaminants prior to releasing the exhaust into the atmosphere. One such
system uses urea-based Diesel Exhaust Fluid (DEF) catalyst which is combined with the exhaust gasses
in the EATS to bring the emissions to acceptable levels.
The DGC-2020 meters EATS information from the engine ECU via J1939 CAN bus and
displays the DEF level within the DEF tank(s), and also displays several pre-alarms
related to the EATS system. Any DEF related pre-alarms annunciated on the front panel
display the symbol used for DEF functions which is shown to the right.
Most systems will contain one DEF tank, while some may contain two tanks. The DGC-2020 front panel
displays the level of DEF in each tank under Metering
Alarms-StatusJ1939 StatusDEF Tank1 LVL%
and Metering Alarms-StatusJ1939 StatusDEF Tank2 LVL%. The tank 1 level is sent from the ECU
via SPN 1761 in J1939 PGN 65110 - After Treatment 1 Reagent Tank 1 Information. The tank 2 level is
sent from the ECU via SPN 4367 in J1939 PGN 64829 - After Treatment 1 Reagent Tank 2 Information.
The tank levels are expressed in units of percent.
Pre-Alarms
The ECU sends DEF level diagnostics to the DGC as SPNs 5245 and 5246 in PGN 65110 (the AT1TI
PGN). SPN 5245 communicated DEF level diagnostics, whereas SPN 5246 communicates DEF
inducement level status.
There are several pre-alarms related to the EATS which annunciate DEF level diagnostics and DEF
inducement level status. They are always enabled and will annunciate when received from the engine
ECU. Each of them contains the symbol for DEF functions when annunciated on the front panel; however
it will not be displayed in BESTCOMSPlus. The pre-alarms are summarized in the following paragraphs.
•
DEF FLUID LOW: This pre-alarm displays when SPN 5245 has a value of 1, indicating that the DEF
tank level is low. The exact DEF levels which constitute a low DEF condition vary among
manufacturers.
•
DEF LOW SEVERE: This pre-alarm displays when SPN 5245 has a value of 4, indicating that the
DEF tank level is severely low or empty. The exact DEF levels which constitute a severely low DEF
condition vary among manufacturers. When this occurs and is not remedied, the engine ECU may
enter a mode of inducement not to operate the engine where some of the conditions in the pre-alarms
descriptions below may occur.
•
DEF WARNING: This pre-alarm displays when SPN 5246 has a value of 1. This is the lowest level of
warning which indicates the EATS is not functioning properly or DEF quality or level is insufficient for
proper operation.
•
DEF WARNING LVL2: This pre-alarm displays when SPN 5246 has a value of 2. This is a higher
level of warning which indicates the EATS is not functioning properly or DEF quality or level is
insufficient for proper operation. If the problem causing this warning is not corrected, the system will
eventually enter the DEF inducement states. In these states, the engine power or operating speed
may be derated depending on the engine manufacturer and engine application.
9400200990 Rev X DGC-2020 Exhaust Treatment E-3