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9.1.7
Maintenance
9.1.7.1
Explosion protection for machines with type of protection "Ex d"
For explosion-protected motors with type of protection "flameproof enclosure" according to
IEC / EN 60079–0 and IEC / EN 60079–1, observe the following:
It is not permissible to subsequently machine or paint contact and mating surfaces of the parts
listed below:
● Stator frame
● End shields
● Bearing covers
● Motor shaft
● Gland plate
● Terminal box base
● Terminal box cover
● Gland plates for additional terminal boxes, where present
Keep these surfaces clean and protect them against corrosion by applying a thin coating of
grease. It is not permissible that any seals are fitted between the surfaces that guarantee that
flame is not transmitted.
9.1.7.2
Explosion hazard due to increased surface temperature
Explosion hazard
Components within the motor may be hotter than the maximum permissible surface
temperature for the enclosure. In an explosive atmosphere, dust can ignite and an explosion
occur. This can result in death, serious injury or material damage.
● Do not open the motor in an explosive and dusty atmosphere when it is still at normal
● Allow the machine to cool down before opening it.
9.1.7.3
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 first time
● After an extended period in storage or downtime
● Within the scope of maintenance work
LOHER CHEMSTAR 1PS5
Operating Instructions 03/2014
WARNING
operating temperature.
Maintenance
9.1 Inspection and maintenance
87
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