Operation Manual / TPL65-A32 / -A33 / -A36 + TPL69-A32 / -A33
4 Operation / 4.4 Speed measurement
© Copyright 2018 . All rights reserved.
HZTL2498_EN
Revision C
April 2018
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).
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