Operating instructions
6
SWITCHING THE MACHINE OFF
CAUTION!
Mistakes when switching off
Avoid causing damage to the electric motor, and only
ever switch the machine off at the starter switch. Do
not use the lockable master switch for this purpose,
and never pull the main plug out when the machine is
switched off.
⇒
Set the starter switch to the “0” position.
•
The motor and the compressor will now switch
off.
•
The compressed air line between the compressor
and the storage tank will let the air off automati-
cally, so as to ensure that the compressor can start
up again with no load against it.
•
Pressure in the storage tank will be maintained.
⇒
Turn the lockable master switch off or plug off.
PROTECTING THE MOTOR FROM
EXCESSIVE TEMPERATURE
Warning!
unexpected start
Units with automatic pressure switch can start by
themselves once the unit has cooled down. This
means people are at risk. For this reason once the
motor protection has been triggered off the unit
should be turned off at the operating switch.
If an excessive load on the machine or too high an
ambient temperature causes an excessively high
temperature in the electric motor, the motor cut-out
on the compressor will automatically shut the
machine down.
THE FOLLOWING STEPS MUST BE TAKEN
WHEN THE CUT-OUT HAS BEEN
TRIGGERED OFF:
⇒
Switch the machine off at the starter switch.
⇒
Discover and rectify the cause of the malfunction.
⇒
Wait another 15 to 20 minutes for the motor to
cool down.
⇒
Reverse the motor protection switch on units with
manual motor protection.
⇒
Restart the machine.
MAINTENANCE
Warning
!
- electrical tension
Even if the machine is switched off, there will still be
current in some of the circuits, and electric shocks
can cause injury if work is being done on them. The
master switch must be switched off or the plug pulled
out of the mains socket before any maintenance work
is done.
Warning
!
- air pressure in the machine
Even if the machine is switched off, the air in the
pipes can still be under pressure, and the unexpected
escape of compressed air can cause injury if work is
being done on them. Pressure must always be let off
from the machine before any maintenance work is
done.
LETTING AIR OFF FROM THE MACHINE
•
The compressor block releases its air pressure
automatically if the plant is switched off in the
proper way (see “Starting up and operating”).
•
To deaerate the air receiver open the condensate
drain and let the total pressure off.
TO DRAIN THE AIR RECEIVER OF
CONDENSATE
On units with air receiver open the condesate drain
„under pressure“ until pure compressed air issues.
Then close the drain again. Condensate contains oil
and must therefore be disposed of in an environmen-
tally responsible way.
CHECK THE OIL LEVEL (only for
units of type GKTE, GKTZ, GKTZH)
CAUTION!
Condensation can ruin the machine
completely
If the machine is set up in a cool, damp place, such as
in a cellar, condensation can form in the lubricating
oil. This is particularly likely to happen if the
compressor is run for too short a time and thus does
not reach its full operating temperature. This conden-
sation then reduces the lubricating effect on pistons
and bearings, and that could destroy them com-
pletely. The signs of condensation in the lubricating
oil are an excessively high oil level, a milky colour in
the oil, or drops of water in the inspection window. If
any of these occur, the oil must be changed at once.
Remedy: install the compressor in a warm, dry room,
or use a smaller compressor.
•
Check the oil level weekly, and top up with an
appropriate oil if necessary.
•
Never mix oil of different types or quality grades
together.
•
The oil level in the inspection window must lie
within the marked circle.
