Siemens 1MB115 Installation And Maintenance Manual page 134

!
Risk of explosion due to alteration of the ignition gap geometry
Changing ignition gap geometries (gap dimensions) as part of repair
work according to the minimum specifications of IEC / EN 60079–1 is not
permissible.
This can result in death, serious injury or material damage.
• Obtain the gap dimensions of the electrical machine from the manufacturer
7.1.8.6 Maintaining the external fan (forced ventilation)
Servicing the external fan
The external 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, as irregular deposits can lead
to an imbalance. The full flowrate is only achieved if the inward flow of air
to the impeller is unrestricted.
Servicing the external fan motor
Please observe all specifications and intervals in the operating instructions
for the external fan motor. If a SIMOTICS XP 1MB1.5/1MB5.5 low-voltage
motor is used as an external fan motor, these operating instructions also
apply for the external fan motor.
To avoid unnecessary downtimes, always carry out all inspection and
maintenance work on the main and external fan motor simultaneously.
• Perform an occasional visual inspection of the external fan motor and check
it electrically and mechanically every time the rolling bearings are replaced.
134
WARNING
for the repair or restoration of ignition gap geometries.
!
WARNING
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 external fan,
disconnect it from the mains, particularly before opening the terminal
box. Make sure that the device cannot be switched back on.