Flexible Cut-Out - ABB HT842305 Operation Manual

Operation Manual / TPL85-B14/-B15/-B16
4 Operation / 4.7 Flexible cut-out

4.7 Flexible cut-out

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With a clean filter silencer (and clean filter mat, if provided), the max-
imum pressure loss (A) is 120 mm H
When the pressure loss (A) has reached 200 mm H
Clean filter silencer.
u
NOTICE
Reading off pressure loss
The measuring rod on the U-tube manometer can be withdrawn to the
bottom water level so that the pressure differential (A) can be easily
read off.
The U-tube manometer can be read off more easily if slightly coloured
water is poured in.
At low load, an engine that is being charged by several turbochargers
can be operated with one turbocharger shut down. Flexible shutting
down or switching on of a turbocharger is called "flexible cut-out". In
flexible systems, slide valves or flaps are installed upstream of the gas
inlet and downstream of the air outlet of the turbocharger.
The lubricating oil supply of the shut-down turbocharger must not be
switched off because of engine vibration. To ensure that there are no oil
and gas leaks, this turbocharger must be supplied with sealing air.
A turbocharger may only be shut down or switched on if the engine is
stationary or running "dead slow" (auxiliary blowers in operation). If
switching over results in turbocharger surging, a switch-over may only
be carried out with the engine is stationary until the cause has been
eliminated.
CAUTION
Automatic switching of the flaps
During automatic flap control, there is a risk of the turbocharger rotat-
ing opposite the intended direction of rotation if the air-outlet flap is
open further than the gas inlet flap during the switching process. This
can lead to damage on the turbocharger.
The turbocharger should only be switched on or off below charging
u
pressures of 0.3 bar.
Close the compressor outlet flap just before the gas inlet flap.
u
HZTL2491_EN
O at full load.
2
O:
2
Revision C August 2018