Gardner Denver L23, Original Operating And Service Manual

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4 Safety Regulations
17
Danger Safety measure required
Risk of electric shock. Work on the electrical systems of the machine / installation may only be
carried out by a trained electrician in accordance with electrical regulations.
The system must be secured from being switched on. Seal off the main switch
and remove the key and/or attach a warning sign to the main switch.
L23RS-L29RS only: Danger of electric shock from loaded condensers!
Always first disconnect the system from the power supply and wait another
10 minutes before touching the electrical components. The power condensers
require this time in order to discharge!
Check the DC bus voltage at the system terminal strip of the frequency
converter by measuring this between the +DC and -DC terminals (the exact
position can be found in the supplied frequency converter operating manual),
between the +DC terminal and the chassis as well as between the -DC
terminal and the chassis. The voltage must read zero in all three
measurements.
The machine may start up
unexpectedly. Only carry out maintenance and repair work when the system is not in
operation and the power supply disconnected. Ensure that the power unit
cannot be switched on inadvertently. The system must be secured from being
switched on.
Seal off the main switch and remove the key and/or attach a warning sign to
the main switch.
Risk of injury from pressurized or
moving parts. Only carry out inspection, maintenance, and repair work when the screw com-
pressor system is at a standstill and is not under pressure. The system must
be secured from being switched on.
Before removing or opening pressurized components, positively isolate any
source of pressure and depressurize the entire system.
During the course of maintenance and
repairs, parts can be damaged which
are important for safety. Never weld any pressure reservoir or change it in any way.
If work which produces heat, flames, or sparks has to be carried out on a
machine, the adjacent components have to be protected by means of non-
inflammable material.
Motor, air filter, electrical components, and regulating equipment have to
protected from the ingress of humidity, e.g., when cleaning the system by
means of a steam jet.
Under no circumstances must the sound-proofing material be removed or
modified.
Never use etching solvents which could attack the materials used.
Before cleaning the machine with water or steam jet (high-pressure cleaner)
or other cleaning agents, cover/mask all openings which have to be protected
from the ingress of water, steam or detergents for safety and/or functional
reasons, in particular electric motors and switch cabinets. After cleaning,
remove the covers/masking completely.
After cleaning, check all hydraulic oil lines for leaks, loose connections, chafe
marks and damage! Immediately remedy any defects found!
Risk of fire with welding work Never weld or carry out other work which requires heat near the oil system.
Pressure reservoir or components and pipes containing oil have to be drained
completely and cleaned, for example by means of a steam jet, before
beginning such work.