Safety Instructions When Operating Machines With Fan; Machines With Fan For The Textile Industry; Dangerous Voltage When The Rotor Rotates - Siemens SIMOTICS A 1FU9 Operating Instructions Manual

Synchronous motors
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9.2.3.2

Safety instructions when operating machines with fan

Risk of injury when touching the fan
There is a risk of injury at machines equipped with a fan cover (e.g. on machines in the textile
industry), as the fan is not completely touch protected.
• Do not touch the rotating fan.
• Do not put your fingers into the larger air discharge openings.
• Prevent manual intervention by using suitable measures, e.g. appropriate housings or a
9.2.3.3

Machines with fan for the textile industry

In order to guarantee an essentially unobstructed flow of cooling air containing fluff, remains of
materials or similar dirt, machines used in the textile industry have a larger air discharge cross-
section between the edge of the cover and the cooling ribs of the machine frame.
These machines have a warning sticker on the fan cover.
9.2.4

Dangerous voltage when the rotor rotates

Dangerous voltage when the rotor rotates
There are dangerous voltages at the terminals while the machine rotor rotates and immediately
afterwards.
You must observe the following safety instructions to prevent death, injury or material damage:
• Do not touch the terminals while the rotor is rotating and immediately afterwards.
• To discharge the winding, after the rotor comes to a standstill, connect the winding to
1FU9
Operating Instructions, 10/2023, A5E46712792A
CAUTION
protective grating.
WARNING
ground potential.
9.2 Safety instructions for operation
Operation
95

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