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Shutdown and restart dryer
KE-MT 120-600
33
Shutdown and restart dryer
In the following cases, the dryer must be fully shut down and depressurised:
◊
In the event of an emergency or malfunction
◊
For maintenance work
◊
For dismantling
Risk of injury from escaping compressed air!
Never remove any parts of the dryer, or manipulate the same in any way, as
long as the unit is pressurised! Suddenly escaping compressed air might cause
serious injuries.
Prior to any work, release all pressure from the unit.
Caution!
Risk of damage to the dryer, if it is switched off during the expansion or drying
phase.
During these phases, the pressure in the regenerating chamber is released
to ambient pressure: If the main valve is opened, as the dryer is switched off,
there is a sudden pressure build-up in the chamber. This might result in
◊ damage to the drying agent, and
◊ excessive abrasion, with negative impact on the regeneration capacity.
Before switching off the dryer, wait until it has reached the pressure build-up
phase or is in standby mode (before switchover).
Note:
If the unit is equipped with a compressor synchronisation system, fi rst switch
off the compressor and then wait until the dryer has reached the standby phase
before switching it off with the ON/OFF switch.
This ensures that the regeneration cycle is completed, and that the pressure in
both chambers is at the same level.
As soon as the dryer is switched on again, the programme continues the cycle
from the point at which it has been stopped.
Emergency shutdown
In any emergency proceed as described in the next section.
Depressurising and shutting down the dryer
In order to make the dryer safe, follow the instructions in the next three sections:
Disconnect dryer from compressed air system
Close the compressed air outlet valve (provided by operator).
Close the compressed air inlet valve (provided by operator).
If installed: Open bypass line.
Depressurise dryer
Leave the dryer on until the expansion phase in both vessels has been completed.
During the expansion phase, the vessels are completely depressurised.
Check the pressure in the dryer at both vessel pressure gauges. The pressure gauges
should show value
0
.
Disconnect voltage supply
Switch off the dryer by setting the ON/OFF switch to position 0.
