Periodic Cleaning - Siemens tiastar Instruction Manual

tiastar™ Motor Control Centers Instruction Manual Maintenance
4. Examine insulation on conductors for
overheating or chafing against metal edges
that could progress into an insulation failure.
Any damaged conductors should be replaced.
Replacement conductors should be
rerouted,braced, or shielded if needed to avoid
similar damage in future operation. Temporary
wiring should be removed or replaced by
permanent wiring.
Hazardous voltage.
Will cause death or serious
personal injury.
Disconnect power before working on
this equipment.
5. Operate each switch or circuit breaker several
times to insure that all mechanisms are free and
in proper working order. Check the operation of
the mechanical safety interlocks provided with
the operator (see section on Circuit Breaker/
Disconnect Operator).Never attempt to operate a
switch or circuit breaker by use of excessive force.
6. Visually inspect instruments and pilot lights.
Replace defective pilot lights. Check instrument
calibrations.
7. Check all devices for missing or broken parts,
proper spring tension, free movement, rusting
or corrosion, dirt, and excessive wear. Perform
periodic maintenance on components as detailed
in the component instruction books.
8. Recommended to go along with the maintenance
program for a motor control center is an adequate
stock of renewal parts. This is important where
service becomes a critical factor or downtime is
extremely expensive. The items kept in stock will
depend on the type of motor control center and
its application. Typical items kept in stock should
include contact kits, magnet coils, and fuses.
When ordering renewal parts, the following
information must be provided.
1. Complete part numbers of items required.
2. Quantity of parts required.
3. Description of parts.
4. Motor control center catalog number. The
catalog number is found on the control center
nameplate located on front of the center.
36
5. Unit identification number. The number is
located on a label on the side of the control
unit for which the ordered parts are needed.
See the Siemens control catalog and the following
replacement part publications for starters.
0 - 1 3/4 14 - GCF 4
2 - 2 1/2 14 - GFF 4 1/2 - 5
3 - 3 1/2 14 - GHF 6

5.3 Periodic cleaning

Accumulation of dust and foreign material such
as coal dust, cement dust, or lampblack must be
removed from all control equipment and all surfaces
must be wiped clean at regular intervals. Dirty, wet,
or contaminated parts should be replaced unless
they can be cleaned effectively. Dust can collect
moisture, causing voltage breakdown and it can
reduce the effectiveness of heat sinks.
Control equipment parts should be cleaned by
vacuuming or wiping with a dry cloth or soft brush.
Use care to avoid damaging delicate parts.
Liquid cleaners, including spray cleaners, are not
recommended due to the possibility of residues.
Compressed air is not recommended for cleaning
because it will only distribute contaminants on other
surfaces, and may damage delicate parts. The inside
bottom of the motor control center should also be
cleaned, including removal of any hardware or
debris, so that any new or unusual wear or loss of
parts occurring after the inspection may be more
readily detected during subsequent maintenance.
Inspect the motor control center for any signs of
previous wetness or dripping inside the controller.
Condensation in conduits or dripping from an
outside source is a common cause of failure.
Seal off any conduits that have dripped condensate,
and provide an alternative means for the conduit to
drain. Seal off any cracks or openings which have
allowed moisture to enter the enclosure. Eliminate
the source of any dripping on the enclosure and any
other source of moisture. Replace and thoroughly
dry and clean any accumulation of deposited
material from previous wettings.
14 - GJB
14 - GKF
14 - GMF