Table of Contents
Advertisement
Operation Manual / Power2 850-M / 4 Product description
4 Monitoring during operation / 4.3 Speed measurement
4.3.3
Differences in speed between the low-pressure or high-
pressure stages on one engine
The speeds of the low-pressure stages differ significantly from the speeds of the high-pres-
sure stages.
A Power2 turbocharging system for V-engines, for example, can consist of multiple low-pres-
sure and multiple high-pressure stages. In this case the speeds of the low-pressure stages
only differ a little from each other. The same also applies to the high-pressure stages.
The difference between the highest and the lowest speed must not be more than 3 %, relat-
ive to the speed limit n
If this admissible difference range is exceeded, the following steps must be performed:
Reduce the engine performance until the maximum speed of all low and high pressure
u
stages does not exceed 70% of n
If the engine cannot be stopped, it can continue to be driven with this reduced engine
u
performance or at this low-pressure and high-pressure stage speed.
If a low-pressure or high-pressure stage surges continuously, the engine performance
u
must be reduced further.
Measure the temperatures in the air lines and exhaust gas pipes from and to the low-
u
pressure and high-pressure stages and compare with normal values.
Check the pressure loss of the alternative air inlet and compare it with normal values.
u
If the engine can be stopped temporarily:
Inspect air lines, exhaust gas pipes and the low-pressure and high-pressure stages and
u
remedy any malfunctions.
In any case, contacting the nearest ABB Turbocharging Service Station is recommended.
u
4.3.4
Malfunction of the speed measurement system
The possible reasons for malfunction of the speed measuring system are described in
chapter Troubleshooting /
© Copyright 2019 ABB. All rights reserved.
.
Bmax
.
Bmax
Speed measurement system
HZTL4061_EN
→44.
Rev.B
June 2019
Advertisement
Table of Contents
