ABB A140-H56 Operation Manual page 52

Operation Manual / A130-H.. - A140-H..
6 Monitoring during operation
6.2.3 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 turbochar-

ger speed does not exceed 70 % of n
If the engine cannot be stopped, it can continue to be driven with this reduced engine per-

formance 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 tur-

bochargers and compare with normal values.
If the engine can be stopped temporarily:
Inspect air lines, exhaust gas pipes and the turbochargers and remedy any malfunctions.

In any case, contacting the nearest ABB Turbocharging Service Station is recommended.

6.2.4 Replacing the speed sensor
Hot cable connector and hot speed sensor
Danger of burns. The cable connector and the speed sensor can reach tem-
peratures of more than 100 °C during operation.
WARNING
When disassembling the cable connector and speed sensor, wear leather

gloves.
Reduce the engine performance to idling and then stop the engine. Observe post-

lubrication (Stopping the engine [➙ 59]).
Switch off the lubricating oil supply to the turbocharger.

Disconnect the cable connector from the speed sensor.

Screw out defective speed sensor.

Screw in new speed sensor to the stop.

(Table of tightening torques [➙ 103])
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HZTL2414_EN
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Revision B
March 2013