4.12.2.5
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
.
4.12.2.6
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
10.18 Temporary isolate the HP SCR system
4.12.3
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
.
Fig 4-16
HP SCR system - principal control configuration
E49
PCS
ECR
Engine room
E50
E48
AMS
ECS
Signals
External main
control panel
X72-B
AA00-9270-00AAA-043A-A
Operation Manual
HP Selective catalytic reduction system
Winterthur Gas & Diesel Ltd.
- 105 -
Issue 003 2021-12
