Siemens SIMOTICS M-1PH8 Operating Instructions & Installation Instructions page 67

Figure 6-2
External ground connection
Motors with a power rating of more than 100 kW must be grounded via the additional grounding
screw M12 at the mounting flange. Use a cable lug in accordance with DIN 46234.
Protection against humidity
Protect the device against humidity. Water must not be allowed to run along the cables and
into the terminal box.
● Use suitable cables at the connection cable gland on the terminal box.
● Ensure the terminal box cover is properly mounted and completely closed.
See also
Operating instructions, external fan (Page 144)
Connecting an external fan (type 1PH818., 1PH822.)
The external fan is connected in the external fan terminal box. If necessary, you can rotate the
external fan through 90°.
SIMOTICS M-1PH8
Operating Instructions 05/2012 A5E03986435A AA
Connection in the external fan terminal box
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.
Electrical connection
6.4 Auxiliary circuits
67