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9.2.6.7
Servicing the external fan
● Check the external fan every 12 months for mechanical vibration as specified in DIN ISO
● Regularly clean and inspect the fan. Impeller and frame are subject to natural wear
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
● The external fan can automatically switch on and switch off as a result of its inherent
● After a power failure or when the power has been disconnected, the external fan starts up
● Wait until the external fan has come to a standstill before approaching it.
● Provide a protective circuit that prevents the main motor from being switched on when the
Clean the external fan
Danger of shearing
Death, severe injury and material damage can occur if you come into contact with the rotating
fan impeller.
● The fan impeller must be stationary when carrying out any work on the external cooling
● Interrupt/disconnect the external cooling unit circuit.
● Lock out the circuit so that it cannot be switched on again.
SIMOTICS M-1PH8 1PH818., 1PH822., 1PH828.
Operating Instructions 10/2017
10816. The maximum permissible vibrational severity is 2.8 mm/s measured at the fan
housing.
depending on the area of application and displacement medium.
WARNING
Impeller can crack
Due to deposits and the resulting imbalance there is a hazard of fatigue fracture of the
impeller. The impeller can crack in operation. Death, serious injury, or material damage
can result.
● Regularly clean and inspect the fan.
WARNING
changes to the fan.
function.
automatically again when the voltage is restored.
external fan is not in operation.
WARNING
system.
Maintenance
9.2 Inspection and maintenance
117
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