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5.11 Engine with exhaust gas aftertreatment – Emergency stop via
automation system
NOTICE
An emergency stop subjects the engine system to an extremely high load.
Risk of overheating, damage to components!
• Trigger an emergency stop only in emergency situations.
Emergency engine stop via automation system
Item
Action
Automation system
Emergency stop via the automation system (→ Operating Instructions Auto-
mation System).
Overview of emergency stop functions
Normal stop
Emergency stop
Emergency stop
MTU designa-
tion
"Power-Off SCR"(*)
Emergency stop function
"Emergency Engine Stop"
Higher-level emergency
stop function
"Emergency System Stop"
Function
SCR OFF in the event of
faults, power supply OFF
Emergency engine stop
Emergency stop of engine
and EGA
Engine behavior
Engine running; no impact
on engine function
Engine at standstill; fuel in-
jection OFF
Engine at standstill, power
supply to engine interrupted
Behavior of ex-
haust gas after-
treatment sys-
tem (SCR sys-
tem)
Sensors/actuators, control
units OFF; circulation cool-
ing OFF
Circulation cooling contin-
ues to run
Exhaust gas aftertreatment
OFF, power supply to ex-
haust gas aftertreatment
system interrupted; circula-
tion cooling OFF
Implementation
Interruption of power supply
to exhaust gas aftertreat-
ment system implemented
by shipyard as color-coded
ON/OFF switch
Comment
Pumps and/or actuators to
supply the SCR system with
urea solution and to be in-
stalled by the shipyard,
must be combined with SCR
Emergency emergency stop
by the shipyard.
Engine and exhaust gas af-
tertreatment system have
separate power supplies.
Both supplies must be inter-
rupted for an “Emergency
System Stop”.
CAUTION:
Emergency stopping may cause overheating rendering the dosing units inoperable. Dosing system compo-
nents must be consequently replaced. The SCR system does not work any more if the dosing units are dam-
aged by overheating.
(*) Actuate the Power-Off SCR switch:
• When performing maintenance work on the SCR boxes
• When servicing the ECU
• in case of fire in the SCR system
• On taking the entire urea solution system out of operation (e.g. in case of malfunction).
MS150123/01E 2017-05
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