Operation
9270−1/A1
Winterthur Gas & Diesel Ltd.
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3. Operation Modes
The operation modes that follow are available:
D Tier II without SCR operation, refer to paragraph 3.1
D SCR heating, refer to paragraph 3.2
D Tier III, refer to paragraph 3.3.
3.1 Tier II without SCR Operation
This operation mode lets you operate the engine without a urea injection. This keeps
the engine in the NO
x
limits of Tier II (the SCR system is bypassed).
This SCR operation will be automatically activated if the system cannot operate in
other selected operation modes. Also, this includes emergency operation modes e.g.
operation with unserviceable turbocharger.
3.2 SCR Heating − Prepare
The primary function of this mode is to prepare the SCR system for operation. You
can also use this mode to keep the SCR system on stand-by for operation.
The SCR reactor must only be operated in a specified temperature range.
You can activate the SCR heating mode if the SCR system is serviceable and the
exhaust gas temperature is at the minimum level. When the SCR system is at the
operation condition, the SCR system goes to stand-by mode.
If the SCR heating mode is selected while the engine operates at less than the
minimum load for SCR operation, the SCR system is bypassed.
Note: This operation mode can also be used to keep the SCR system ready for
operation immediately. If this operation mode is activated, the engine
operates in Tier II mode without SCR operation.
Note: After operation in Tier III mode, the SCR heating mode can be used to
replace catalyst elements e.g. operate the engine at more than 50% load
for one hour. You must obey the specification of the SCR supplier.
2016−11
Selective Catalytic Reduction System
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