ABB HT563116 Operation Manual page 63

Operation Manual / 4 Product description / A130-M.. - A145-M..
4 Monitoring operation
4.3.3 Speed differences with several turbochargers per engine
The speeds of all turbochargers on an engine vary only slightly from each other in standard
operation.
The difference between the highest and the lowest turbocharger speed must not be more than
3 %, relative to the speed limit n
If this admissible difference range is exceeded, the following steps must be performed:
Reduce the engine performance immediately to the point at which the maximum speed of

all turbochargers does not exceed 70% of n
If the engine cannot be stopped, it can continue to be driven at this reduced engine load or

turbocharger speed.
If a turbocharger surges continuously, the engine performance must be reduced further.

Measure the temperatures in the air lines and exhaust gas pipes from and to the

turbochargers and compare with normal values.
Check the pressure loss of the alternative air inlet and compare it with normal values.

If the engine can be stopped temporarily:
Inspect air lines, exhaust gas pipes and the turbochargers and remedy any malfunctions.

ABB Turbo Systems recommends contacting the nearest ABB Turbocharging Service

Station.
4.3.4 Malfunctions on the speed measurement system
In the case of malfunctions of the speed measurement system, refer to the chapter entitled
Troubleshooting/Speed measurement system [➙ 71].
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Revision C February 2016