MTU Gas engine8 V 4000 L62 Operating Instructions Manual page 149

068 – SS T-Coolant
Red alarm. Engine shutdown.
Associated parameter 2.0120.932
Cause
Coolant temperature after engine
too high (limit value 2). Engine
coolant pump failure, volumetric
flow too low, air in engine
coolant circuit.
089 – SS Engine Speed too Low
Red alarm. Engine shutdown.
Associated parameter 2.2500.030
Cause
Engine is stalled. Engine speed
in normal operation has fallen
below the limit value of
parameter 2.2500.027 (speed
limit for stalling) without an active
stop command. The engine is
shutdown for safety reasons.
090 – SS Idle Speed Not Reached
Red alarm. Start terminated.
Associated parameter 2.1090.925
Cause
Idling speed not attained.
ZKP-Number:
Corrective action
u Check engine coolant circuit.
ZKP-Number:
Corrective action
1. In parallel operation connected to mains:
• Check mains for frequency drop.
• Check generator and coupling for damage.
2. In isolated operation:
• Check throttle position.
• Check throttles for implausible closing. If throttles are fully
open: Check if load step values are admissible.
• Check bypass position.
• Check air filter for contamination, replace if contamination is
visible (→ Page 68),
• Check exhaust back pressure.
• Check differential pressure over mixture cooler.
• Check emissions and injection timing (→ Page 52).
• Check oil separator efficiency (oil in compressor intake
elbow), clean compressor if necessary.
• Check valve clearance (→ Page 60).
• Check gasket between mixture line and cylinder head for
correct installation position.
ZKP-Number:
Corrective action
1. Check ignition.
2. Check gas supply.
3. Check mixture setting.
MS150032/02E 2012-07 | Troubleshooting | 149