Siemens SIMOTICS M-1PH8 Operating Instructions & Installation Instructions page 100

Maintenance
9.3 Inspection and maintenance
Cleaning the fan
If the fan blades need to be cleaned, the following points must be observed:
Danger of shearing
During maintenance work on the forced ventilation unit (e.g. when cleaning the fan blades),
the fan must be at a standstill. The circuit for the forced ventilation unit must be open and a
safeguard must be provided to prevent unintentional reclosing.
Avoid the effects of excessive force
If excessive forces are present, this can damage the fan blades.
The fan should be cleaned with a suitable cloth or brush, and steps should be taken to prevent
moisture from entering the motor.
● Once the voltage has been disconnected on all poles, wait for five minutes before touching
● Never open the device during operation.
● Never loosen any fixing screws for the ventilation unit during operation.
100
WARNING
Voltages at the internal motor connections
The motor may continue running, e.g. due to airflow, or may run on after being shut down.
This means that dangerous voltages of over 50 V can occur at the internal motor
connections. Death, serious injury, or material damage can result.
● For safety reasons, it is not permissible to make any unauthorized modifications or
changes to the fan.
● Due to the way it functions, the fan switches on and off automatically.
● After a power failure or when the power has been disconnected, the fan starts up
automatically again when the voltage is restored.
● Wait until the fan has come to a standstill before approaching it.
● Provide a protective circuit that prevents the main motor from being switched on when
the external fan is not in operation.
DANGER
CAUTION
the device.
Operating Instructions 05/2012 A5E03986435A AA
SIMOTICS M-1PH8