Dangers During Maintenance And Repairs - Gardner Denver L Series Original User And Service Manual

Danger
In the event of faulty sensors, the
system can be led into a dangerous
state of operation.

4.8 Dangers during maintenance and repairs

Danger
During maintenance and repairs, parts
that may be pressurized must be
removed. If you maintain the
compressor and have not been trained
by Gardner Denver, you will put yourself
and others at risk.
Incorrectly configured spare parts may
jeopardize safety, e.g., tear when
loaded.
Risk of electric shock.
The machine may start up
unexpectedly.
Risk of injury from pressurized or
moving parts.
Safety measure required
Check the accuracy of pressure and temperature indicators at regular
intervals. If the admissible tolerance limits have been exceeded, these
devices have to be replaced.
Safety measure required
The compressor can only be maintained by specially trained technicians.
Contact your Gardner Denver agent.
Spare parts must meet the technical requirements laid down by the
manufacturer. This is always guaranteed when original spare parts are used.
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.
L90RS-L132RS 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.
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.
Only carry out inspection, maintenance, and repair work when the screw
compressor 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.
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