The following information is provided regarding the state of the winding insulation:
● Is the winding head insulation conductively contaminated?
● Has the winding insulation absorbed moisture?
As such, you can determine whether the machine needs commissioning or any necessary
measures such as cleaning and/or drying the winding:
● Can the machine be put into operation?
● Must the windings be cleaned or dried?
Detailed information on testing and the limit values can be found here:
"Testing the insulation resistance and polarization index" (Page 42)
Inspections in the event of faults
Natural disasters or unusual operating conditions, such as overloading or short circuit, are
faults that overload the machine electrically or mechanically.
Immediately perform an inspection after such faults.
First inspection after installation or repair
Perform the following checks after approximately 500 operating hours or at the latest six
months after commissioning:
The stated electrical characteristics are being observed.
The permissible bearing temperatures are not exceeded.
The smooth running characteristics and machine running noise have not
The motor foundation has no cracks and indentations. (*)
(*) You can perform these checks while the motor is running or at a standstill.
Additional tests may also be required according to the system-specific conditions.
When carrying out the inspection, if you detect any impermissible deviations from the normal
state, you must rectify them immediately. They may otherwise cause damage to the machine.
SIMOTICS TN Series N-compact 1LA8
Operating Instructions 05/2016
Checks after assembly or repair
9.1 Inspection and maintenance