9.2.10 Risk of explosion due to damaged seals
WARNING
Risk of explosion due to damaged seals
The seals can be damaged if you clean motors with type of protection Ex t using compressed
air. The type of protection is no longer complied with. An explosion can occur. This may result
in death, personal injury and material damage.
• Avoid pointing compressed air directly onto shaft sealing rings or labyrinth seals of the
machine.
9.2.11 Drain condensate
If there are condensation drain holes present, open these at regular intervals, depending on
climatic conditions.
WARNING
Hazardous voltage
The winding can be damaged if objects are introduced into the condensation holes (optional).
This can lead to death, serious injury or material damage.
Note the following to maintain the degree of protection:
• Switch o the machine so that it is in a no-voltage condition before you open the
condensation drain holes.
• Close the condensation drain holes, e.g. using T-plugs, before commissioning the machine.
NOTICE
Reduction of the degree of protection
If condensation drain holes are not closed, then this can result in material damage to the motor.
In order to maintain the degree of protection, after the condensation has been drained, you
must close all of the drain holes.
9.2.12 Insulation resistance and polarization index
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 rst time
• After an extended period in storage or downtime
• Within the scope of maintenance work
Maintenance
9.2Inspection and maintenance
1MB..1/2/3/4 - shaft heights 63 ... 355
124 Operating Instructions, 11/2023, A5E52779900A
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