MTU 12V2000M91 - Overspeed test with the engine at standstill

Overspeed test with the engine
at standstill
Note: Overspeed test with the engine at standstill
can only be carried out if the engine is equip-
ped with a monitoring unit.
1. Press TEST OVERSPEED illuminated pushbut-
ton (3). Observe speed limit and speed simu-
lated by the engine monitoring unit on dis-
play.
Result: • Engine governor is de-energized by the
safety system.
• On engines with emergency-air shutoff
flaps: Flaps close.
• EMERGENCY STOP button (2) flashes; Sig-
nalization (horn, beacon etc.) is released;
ALARM ACKNOWLEDGE button (1) is illu-
minated brightly.
2. Press ALARM ACKNOWLEDGE button (1).
Result: Audible and visual signalization stops.
3. Press ALARM ACKNOWLEDGE illuminated
pushbutton (1) again.
Result: Power supply to engine governor is re-estab-
lished.
4. On engines with emergency-air shutoff flaps:
open flaps.
Emergency stop simulation with
the engine at standstill
1. Open cap of EMERGENCY STOP illuminated
pushbutton (2).
2. Press EMERGENCY STOP illuminated push-
button (2).
Result: • Engine governor is de-energized by the
safety system.
• On engines with emergency-air shutoff
flaps: Flaps close.
• EMERGENCY STOP button (2) flashes; Sig-
nalization (horn, beacon etc.) is released.
ALARM ACKNOWLEDGE button (1) is illu-
minated brightly.
3. Press ALARM ACKNOWLEDGE illuminated
pushbutton (1).
Result: Audible and visual signalization stops.
4. Press ALARM ACKNOWLEDGE button (1)
again.
Result: Power supply to engine governor is re-estab-
lished.
5. On engines with emergency-air shutoff flaps:
open flaps.
154 | Task Description | MW15409/04E 2015-08
TIM-ID: 0000008873 - 003