WinGD X72-B - LP-SCR System: Change Tier Mode

8.21 LP-SCR system: Change Tier mode
The low pressure selective catalytic reduction system (LP-SCR) has 3 different operation modes.
•
Tier II mode
•
Prepare Tier III mode
•
Tier III mode
Before changing modes, make sure these preconditions are fulfilled:
•
The engine is running
•
All limits are deactivated (for example CA limit, Torque limit)
•
The engine is running with all cylinders (no cylinder cut-off)
•
The “No Limit” cancel button is on
•
There is no engine slowdown
•
The engine is not operating in rough sea
•
The engine is without any other major flaws
•
The exhaust valve system is in the ready condition
•
The regeneration procedure is inactivate
•
The emergency bypass is deactivated unless the emergency bypass switch is operated
•
The CAN communicates properly with the engine control system
If all the preconditions are met, the LP-SCR can change modes in the following 3 ways:
•
Change from Tier II mode to Prepare to Tier III mode
NOTE: It is possible to change directly from Tier II mode to Tier III mode without changing
to Prepare to Tier III mode. However, this direct change can fail. It is recommended
to change from Tier II to Prepare to Tier III mode first.
1 Press the button: Select Prepare Tier III mode
NOTE: The LED next to Select: Prepare Tier III will be flashing during the change
to the Prepare to Tier III mode.
2 Check, if the LEDs on your LDU corresponds to the LEDs on the illustration, see:
•
Change from Prepare to Tier III mode to Tier III mode
1 Press the button: Select Tier III mode
NOTE: The LED next to Select: Tier II will be flashing during the change to the Tier
III mode.
2 Check, if the LEDs on your LDU corresponds to the LEDs on the illustration, see:
•
Change from Tier III mode to Tier II mode
1 Press the button: Select Prepare Tier II mode
NOTE: The LED next to Select: Tier II will be blinking during the change to the Tier
II mode.
2 Check, if the LEDs on your LDU corresponds to the LEDs on the illustration, see:
X72-B
AA00-9270-00AAA-100B-A
Operation Manual LP-SCR system: Change Tier mode
Winterthur Gas & Diesel Ltd.
- 358 - Issue 003 2021-12