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Product documentation 1D 3.8.en Rev. E, 10/13 page 19/42
The accuracy of the humidity indicators depends heavily on the temperature. When the ambient temperature
is 20° C, they are sufficiently accurate but, at other temperatures, the humidity levels they indicate are too
high.
If the relative humidity rises above 60 %, a check must be made to make sure that the contents and the
packing are undamaged. To do this, open the case carefully and check the contents for corrosion.
The date of initial conservation as well as the expiry date is marked on the cases.
Date of initial conservation: Month Year
Expiry date: Month Year
Check the effectiveness of sealed wrappings every 8 weeks if no other intervals have been specified.
The results of such inspections must be recorded. Cases in which the relative humidity has risen rapidly or
stayed at a high level must be checked.
3.6 Inspection intervals during storage
Customer shall carry out the regular inspection of the stored machine in consideration of way of storage. Each
inspection check must be recorded properly in the storage report. Inspection intervals must be done
according to the
Tab. 1 Check intervals
Way of storage Inspection interval
Short term storage <2 years Every two months
Long term storage >2 years Once an half a year
Tab. 1 Check intervals
3.7 Control check during storage
3.7.1 Sealed packing
• Visual check of the humidity indicators. If the humidity indicator indicates a level of 50% or higher
the desiccant bags and humidity indicator card must be renewed and sealed packing and storage
conditions must be checked.
• Check the effectiveness of sealed wrappings (damage). The results of such inspections must be
recorded.
3.7.2 Non-sealed packing
• It is necessary to rotate by rotor 1 time per half a year about 90° - 120°. For this particular order is
allowed to rotate with rotor in horizontal position.
• Visual check of the thickness of preservation coat, in case the protective layer is damaged, it is
necessary to treat the damaged place again.
• Visual check of the machine. A service man shall carry out a check of machine preservation
treatment and shall write down storage conditions (temperature, humidity, dew point).
• Measuring of insulation resistance of stator winding. In case the value of insulation resistance is
lower than values given in chapter
4.2.13, it is necessary to dry the machine without delay by
checking the storage conditions and switching the heaters on.
WARNING
The anti-condensation heater must not be switched on when sealed packing is used.
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