4.15.2.5 HP SCR system - at engine stop
If you stop the engine in Tier III mode, the HP SCR system changes to bypass mode after some
time. Related to the condition the venting/sealing unit starts for some minutes, refer to Para
4.15.2.2.
4.15.2.6 HP SCR system - cut out
If necessary you can cut out the HP SCR system. When the engine is stopped, you can install
covers to the valves V1 and V2 to make a safe stop of the exhaust gas through the HP SCR
system, refer to section [section not applicable for this engine].
4.15.3 HP SCR control system
The HP SCR control system has the three control boxes that follow:
•
Control box E48
•
Control box E49
•
Control box E50
Each control box is connected through bus connections or hard-wired connections. The control
box E48 is connected to the engine control system (ECS) and to the external HP SCR system
control through bus connections or hard-wired connections, refer to Figure 4-33.
Fig 4-33 HP SCR system - principal control configuration
E49
PCS
ECR Engine room
E50 E48
AMS
ECS Signals
External main
control panel
X92DF
AA00-9270-00AAA-043A-A
Operation Manual HP Selective catalytic reduction system
Winterthur Gas & Diesel Ltd.
- 129 - Issue 002 2020-08
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