If work is to be carried out on the electrical system
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A190-930TX_EN_03_ 2009-02-06
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
.
ON/OFF switch
If work is to be carried out on the electrical system
►
Depressurise and shut down the dryer, following the instructions in the above
chapter.
Risk of injury due to voltage-carrying parts!
The electrical supply cable and external power lines are live even after the
dryer is switched off and, in the event of body contact, may cause serious
injury! Before carrying out any work on the electrical system, the
electrical supply cable and all external power lines must be made voltage-
free!
►
Make the electrical supply cable to the dryer voltage-free.
►
Secure the electrical supply cable to the dryer against switch-on.
Restart
Depending on the fittings installed by the operator and the actual pressure
conditions, the unit might have to be restarted at operating pressure. The
following general rules apply:
When switched off, the dryer is open in the main flow direction.
The pressure in the vessel drops (provided that the compressed air outlet
valve provided by the operator is opened), if
—
compressed air can escape to the compressed air system,
—
the dewpoint-sensing control is implemented.