9.4.3.1 Cleaning aluminum parts
The surface of untreated aluminum is always covered by a thin but dense oxide skin. This
natural oxide layer acts as surface protection and is the reason for the good weathering
resistance of aluminum materials. In most cases, this means that additional protective
measures are superfluous.
● Remove greasy layers using ethyl alcohol.
● If there are other very dirty areas, use ESD-compliant fiber or plastic brushes for cleaning.
NOTICE
Corrosion damage caused by unsuitable cleaning agents and cleaning instruments
Using unsuitable cleaning chemical agents and cleaning instruments may transfer
metallic, corrosion-inducing impurities onto the aluminum. This can result in corrosion
damage.
● Only use cleaning agents that are suitable for aluminum.
● Use ESD-compliant brushes and cloths.
● Do not use cleaning cloths and brushes that have already been used to clean copper,
brass, bronze or other heavy metals.
● Use neither brass, bronze, or steel-wire brushes nor cloths or steel wool interwoven
with copper wire.
9.4.4 Visual inspections
9.4.4.1 Equipment for visual inspections
You require the following basic equipment to carry out the visual checks and maintenance work:
● Mirror
● Flashlight
● Torque wrench for tightening screws
9.4.4.2 Checking hoisting solenoids and security bolts
● Check the hoisting solenoids and security bolts at regular intervals.
● Replace defective hoisting solenoids and security bolts before (re)commissioning.
9.4.4.3 Checking the isolating clearances
● Slight, dry, non-conducting contamination is permitted.
● Remove contamination caused by dust in conjunction with high humidity.
Maintenance
9.4 Inspection and maintenance
SINAMICS SM150 6SL3845-2NN41-8AD2
Operating Instructions Rev.201910281310 EXAMPLE 139
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