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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?
From this, 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 64)
9.2.13
Maintaining the external fan (forced ventilation)
Rotating or live parts
Live electrical parts are dangerous. Contact with them can cause death, serious injury or
material damage.
Before performing any maintenance work on the separately driven fan, disconnect it from the
mains, particularly before opening the terminal box. Make sure that the device cannot be
switched back on.
Servicing the separately driven fan
The separately driven fan is essentially maintenance-free. However, dirt and dust deposits on the
impeller and the motor, particularly in the gap between the impeller and the inlet nozzle can
impair its function.
• Remove the dirt and dust deposits regularly; the intervals depend on how dirty the
surrounding area is.
• Make sure that the impeller is evenly cleaned if the impeller draws-in a free flow of air, as
irregular deposits can lead to an imbalance.
Full fan performance (flow rate) is only achieved if the impeller can draw-in a free flow of air.
Servicing the separately driven fan motor
Carefully comply with all specifications and intervals in the operating instructions for the
separately driven fan motor. If a SIMOTICS XP 1MB.. low-voltage motor is used as an separately
driven fan motor, these operating instructions also apply for the separately driven fan motor.
1MB..1/2/3/4 - shaft heights 63 ... 355
Operating Instructions, 11/2023, A5E52779900A
WARNING
Maintenance
9.2 Inspection and maintenance
125
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