Operation Manual / TPL73-B.. - 85-B11/ -B12
4 Operation / 4.8 Flexible cut-out
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HZTL2480_EN
Revision D
July 2018
4.8 Flexible cut-out
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.
u
The turbocharger should only be switched on or off below charging
pressures of 0.3 bar.
u
Close the compressor outlet flap just before the gas inlet flap.
CAUTION
Manual switching of the flaps
If the gas inlet flap is opened during cut-out operation or the air-outlet
flap is closed during normal operation, this causes very high turbochar-
ger speeds. These can result in damage with serious consequences or
even a total loss of the turbocharger.
u
Never open the gas inlet flap during cut-out operation.
u
Never close the air-outlet flap during normal operation.
CAUTION
Flexible turbocharger cut out
Improper manipulations can result in inadmissible turbocharger speeds
which can lead to serious damage to property with grave con-
sequences.
u
The air outlet flap and gas inlet flap must be completely open during
normal operation.
u
During cut out operation, the air outlet flap and gas inlet flap must
be completely closed.
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