ENGLISH
V4-007 J EN
Originalbetriebsanleitung
22
7
Switch off / shutdown
Switch off is carried out using the motor power switch.
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If the drive motor is shut down in an operating position with back pressure, the
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pressure decelerates the compressor and brings it to a standstill more quickly. The
non-return valve installed at the discharge side closes, which prevents the com-
pressor from decompressing the compressed material and running in reverse.
If a bypass is installed at the discharge side, it is opened during shutdown and the
compressor is relieved.
Example: No-load/full-load control with a VM compressor.
For the purpose of putting the unit out of operation, the fuses should be removed
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after the compressor has come to a standstill. The slides in the conveying pipes
must be closed. Condensation must be prevented from entering the compressor
stage.
If the standstill is to last for longer than six weeks, the conveying chamber must
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be preserved and the compressor rotated manually on a regular basis to prevent
damage from occurring.
Please also observe storage and mothballing guidelines TN01175... .
If water oil coolers or water aftercoolers are in use,
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the inlet valve must be closed when shutting the unit down/putting it out of opera-
tion.
If there is a risk of frost, drain the water from the cooler or ensure that the flow of
water is not interrupted.
Compressor shutdown with gas cooler and „no-load/full-load regulation“
Before shutting down the compressor, a „dry run“ of
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approx. 2 minutes should be carried out.
During this „coasting-down time“, the compressor must be operated without a
load, and with the throttle valve on the intake side closed and the relief controller
on the discharge side closed, in order to prevent condensation from accumulating.
Compressor shutdown with gas cooler
WITHOUT „no-load/full-load regula-
tion“
To prevent a backflow pf condensation, the gas cooler should have a lower posi
-
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tion than the compressor unit.
In an emergency:
EMERGENCY OFF
button. For details, please refer to the instructions provided by the
electronics supplier/system manufacturer.
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