CAUTION
Dust disturbances when working with compressed air 
When cleaning with compressed air, dust, metal chips, or cleaning agents can be whirled up. 
Injuries can result.
When cleaning using compressed air, make sure you use suitable extraction equipment and 
wear protective equipment (safety goggles, protective suit, etc.).
NOTICE
Damage to insulation
If metal swarf enters the winding head when cleaning with compressed air, this can damage 
the insulation. Clearance and creepage distances can be undershot. This may cause damage 
to the machine extending to total failure.
When cleaning with compressed air, ensure there is adequate extraction.
NOTICE
Machine damage caused by foreign bodies 
Foreign bodies such as dirt, tools or loose components, such as screws etc., can be left by 
accident inside the machine after maintenance is performed. These can cause short circuits, 
reduce the performance of the cooling system or increase noise in operation. They can also 
damage the machine.
● When carrying out maintenance work, make sure that no foreign bodies are left in or on 
the machine.
● Securely attach all loose parts again once you have completed the maintenance 
procedures.
● Carefully remove any dirt.
Note
Operating conditions and characteristics can vary widely. For this reason, only general 
intervals for inspection and maintenance measures can be specified here.
9.1.2 Measurement of the insulation resistance and polarization index in the context of 
maintenance work
Measuring the insulation resistance and polarization index (PI) provides information on the 
condition of the machine. It is therefore important to check the insulation resistance and the 
polarization index at the following times:     
● Before starting up a machine for the first time
● After an extended period in storage or downtime
● Within the scope of maintenance work
Maintenance
9.1 Inspection and maintenance
SIMOTICS TN Series N-compact  1LA8
98 Operating Instructions 05/2016