General Storage Precautions; General; Condensation; Corrosive Environment - ABB DC Machines DMI Operating And Maintenance Instructions Manual

General

Condensation

Corrosive
environment
Vibrations and
bearings
Shaft end
protection
10

General storage precautions

Special attention must be given to machines
which are to be stored for a long period of time
before commissioning.
Caution
Lift all brushes and wrap protective paper around the commutator.
Condensation in a machine may lead to
corrosion and damp windings (low insulation
readings).
If the machine is to be stored in an unheated
room, heating elements must be provided to
Caution
In order to avoid condensation, the machine should be placed in a room or in a building where the tem-
perature varies as little as possible.
There are added complications if corrosive
gases are present which attack the commutator
surface.
Caution
Store the machine in a gas-free room.
If the machine is stored on a vibrating surface
the antifriction bearings are subject to damage.
If this is the case the bearings may have to be
replaced before the machine can be put into
operation.
Caution
Store the machine in a vibration-free room.
All machines leave the factory with an anti-
corrosion coating on the shaft extension.
Caution
The coating should be inspected by the customer and re-applied if necessary.
Condensation, corrosive gases and vibrations
should be avoided.
maintain a constant temperature.
The heating element should be such that the
temperature of the machine is always at least
5 K above the ambient temperature.
The gases that gives the greatest problems and
should be avoided during storage are:
– sulphurous gases
– chlorine
– ammonia
If vibration cannot be avoided, turn the
armature a few times per month.