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Operation Manual / TPS44-F.. - TPS61-F..

Operation 4

Speed measurement 4.4 Page 51

August 2017HZTL2412_ENRevision F

Speed differences with multiple turbochargers per engine

The speeds of all turbochargers on one engine differ only slightly from

each other in normal operation.

The difference between the highest and the lowest turbocharger speed

must not be more than 3 % relative to the speed limit n

Bmax

If this permissible range of difference is exceeded, the following steps

must be carried out:

τ Reduce engine performance immediately until the highest turbo-

charger speed no longer exceeds 70% of n

Bmax

τ If the engine cannot be stopped, continue to run at this reduced engine

performance or turbocharger speed.

τ If the turbocharger surges continuously, engine performance must be

reduced further.

τ Measure the temperatures in the air and gas lines to and from the tur-

bochargers and compare them with standard values.

If the engine can be stopped for a short time:

τ Inspect the air and gas lines as well as the turbocharger and eliminate

any problems.

τ In any event, it is recommended that you contact the nearest ABB

Turbocharging Service Station.

4.4.1

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