ABB HT566891 Operation Manual page 53

4.4.1
© Copyright 2016 ABB. All rights reserved.
Operation
Speed measurement
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
If this permissible range of difference is exceeded, the following steps
must be carried out:
Reduce engine performance immediately until the highest turbo-

charger speed no longer exceeds 70% of n
If the engine cannot be stopped, continue to run at this reduced engine

performance or turbocharger speed.
If the turbocharger surges continuously, engine performance must be

reduced further.
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:
Inspect the air and gas lines as well as the turbocharger and eliminate

any problems.
In any event, it is recommended that you contact the nearest ABB

Turbocharging Service Station.
Operation Manual / TPS44-F.. - TPS61-F..
4
4.4
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Bmax
Page 51
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Bmax