Gardner Denver L55, User And Service Manual

Page: 18 / 64

16 August 20, 2018
4.8 Dangers during maintenance and repairs
Danger Safety measure required
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.
The compressor can only be maintained by specially trained technicians.
Contact your Gardner Denver agent.
Incorrectly configured spare parts may
jeopardize safety, e.g., tear when
loaded
.
Spare parts must meet the technical requirements laid down by the
manufacturer. This is always guaranteed when original spare parts are used.
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.
L55RS-L75RS 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
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.
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.
Modifications to the machine impair
safety. After completing repair work, always check to see whether any tools, loose
parts or cloths have been left in or on the machine, driving engine or driving
equipment.
After the work has been completed, replace any protective devices that have
been removed. Operation without protective devices is not permissible.
Always re-tighten screwed connections which were loosened for maintenance
and repair work.
Machines performing rotating movements have to be cycled several times in
order to ensure that there are no mechanical faults in the machine or the
drive member.
Before releasing the power unit for operation after maintenance or overhaul,
check that the operating pressures, temperatures and time settings are
correct and that the regulating and shutdown equipment function properly.