9.4.3 Visual inspections
9.4.3.1 Equipment for visual inspections
You require the following basic equipment to carry out the visual checks and maintenance
work:
● Mirror
● Torch
● Torque wrench for tightening screws
NOTICE
Contamination
Contamination and dirt can damage the device.
Visually inspect the equipment at least once per year. For more information, please refer to
the section "Visual inspections".
Dust deposits inside the cabinet unit must be removed at regular intervals (or at least once
a year) by qualified personnel in line with the relevant safety regulations.
Note
The actual intervals at which maintenance procedures are to be performed depend on the
environmental and operating conditions. Define maintenance intervals for the drive which
reflect your plant-specific environmental and operating conditions and meet your availability
requirements. When doing so, take the prescribed maintenance intervals into consideration,
as well as the instructions for repairing and replacing installed components.
9.4.3.2 Checking the isolating clearances
● Slight, dry, non-conducting contamination is permitted.
● Remove contamination caused by dust in conjunction with high humidity.
9.4.3.3 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.
9.4.3.4 Checking the plug connections.
Regularly check the plug connections to ensure they are seated correctly and the contacts are
not corroded.
Maintenance
9.4 Preventive maintenance
SINAMICS SM120 6SL38855?B
Operating Instructions 12/2015 97
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