To Next Page

To Previous Page

Operation Manual / TPL69-A10 / -A30 ... TPL77-A10 / -A30

4 Operation / 4.4 Speed measurement

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:

u Reduce engine performance immediately until the highest turbochar-

ger speed no longer exceeds 70% of n

Bmax

u If the engine cannot be stopped, continue to run at this reduced en-

gine performance or turbocharger speed.

u If the turbocharger surges continuously, engine performance must be

reduced further.

u 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:

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

any problems.

u In any event, it is recommended that you contact the nearest ABB Tur-

bocharging Service Station.

4.4.2 Assembly

If the speed sensor is not fitted on the turbocharger, the following pro-

cedure must be adopted to fit it:

w Engine and turbocharger are not running.

w The turbocharger lubricating system is switched off.

u Remove screw plug (42047) from bearing casing.

NOTICE

Part position

The position of the screw plug for measuring the speed is marked "n"

on the bearing casing.

u Screw in speed sensor (86505) as far as it will go and tighten to

torque specified in table. (See chapter Table of tightening torques.)

u Connect speed sensor using cable connector (86515).

Page 41 / 136

ABB TPL69-A Series User Manual

Questions and Answers: