Maintenance
9.3 Corrective Maintenance
1MB..5/6 shaft height 71 ... 355
116 Operating Instructions, 07/2020, A5E41926185A
9.3.1 Extended motor marking
The machine marking based on IEC / EN 60079–0 was supplemented by the "X" symbol.
• Perform maintenance, repair and modification work on explosion-protected machines in
strict compliance with the corresponding national health and safety legislation, the safety
instructions and descriptions in the general maintenance instructions.
Have work influencing explosion protection performed by the manufacturer or by a specialist
workshop for electrical machinery authorized by the manufacturer. This includes the
following operations, for example:
• Repairs to the stator or rotor windings and to the terminals
• Repairs to the ventilation system
• Repairs to the bearings
• Dismantling machines with flameproof enclosures
• Connection work performed in the terminal box
Identify the work performed by an additional repair plate bearing the following information:
• Date
• Company carrying out repair
• Type of repair
• Reference number of the repair technician regarding repair work
Test in accordance with the relevant EU directives after repair.
Explosion hazard due to increased surface temperature
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
operating temperature.
• Allow the machine to cool down before opening it.
9.3.2 Anti-condensation heating
Explosion hazard due to improper maintenance of the anti-condensation heating
If the anti-condensation heating is not correctly repaired, e.g. if unauthorized or untested
spare parts are used, this can result in explosions during operation in a potentially explosive
atmosphere. This can result in death, serious injury or material damage.
• Only appropriately trained specialists in the service center (Page 141) are authorized to
repair anti-condensation heating systems. The anti-condensation heating must then be
subject to a routine test, which requires extensive specialist knowledge.
• Only use authorized and tested spare parts.
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