Basler Electric DGC-2020ES - Manual (Page 229)

9469200990 Rev C 221
power level. The DGC-2020ES only indicates a pre-alarm. It does not prevent the engine
from running or cause operation at a reduced power level, but 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-2020ES meters EATS information from the engine ECU via J1939 CANBus 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-2020ES 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. A DEF level of 8% to 23% causes this annunciation.
•
DEF FLUID EMPTY: This pre-alarm displays when SPN 5245 has a value of 4, indicating that the
DEF tank level is low. The low condition is announced when the tank level is below 8%. 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 ENGINE DERATE: This pre-alarm displays when SPN 5246 has a value of 3, indicating the
Engine Derate level of inducement. This indicates that the engine is going into a reduced power mode
indicating the lowest level of inducement not to operate the engine when the EATS is not functioning
properly or out of DEF.
•
DEF PRESEVERE INDUCEMENT: This pre-alarm displays when SPN 5246 has a value of 4,
indicating the Pre-Severe Inducement level of inducement. This indicates that the engine has entered
the second highest level of inducement not to operate the engine when the EATS is not functioning
properly or the DEF level is low. The ECU will allow the engine to run for a maximum of 3 hours in
this condition. After expiration of the 3 hours, the engine will enter the severe inducement state and
cannot be restarted until the DEF level is raised above 14%.
•
DEF SEVERE INDUCEMENT: This pre-alarm displays when SPN 5246 has a value of 5, indicating
the Severe Inducement level of inducement. This indicates that the engine has entered the highest
level of inducement not to operate the engine when the EATS is not functioning properly or DEF level
is low. The ECU will allow the engine to run for a maximum of 3 hours in this condition. After
expiration of the 3 hours, the engine will enter the severe inducement state and cannot be restarted
until the DEF level is raised above 14%.
DGC-2020ES Exhaust Treatment