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Electrical connection
6.1 Connecting the machine
Risk of explosion by fixing elements becoming loose
If you use fixing elements made from the wrong material or apply the wrong tightening torque,
this could impair current transfer or cause connecting parts to become loose. Fastening
elements can work loosely, so that the minimum air clearances are no longer maintained.
Sparking formation may occur, in an explosive atmosphere it can lead to an explosion. This could
result in death, serious injury or material damage to the machine or even in failure, which could
in turn lead to indirect material damage of the plant or system.
• Tighten the screwed connections to the specified tightening torques.
• Only use the fixing accessories provided or only the original spare parts from Siemens.
• Always carefully check the fastenings when carrying out service work.
See also
Tightening torques (Page 155)
6.1
Connecting the machine
6.1.1
Selecting cables
Take the following criteria into account when selecting the connecting cables:
• Rated current
• Rated voltage
• If required, service factor
• System-dependent conditions, such as ambient temperature, routing type, cable cross-
section as defined by required length of cable, etc.
• Configuration notes
• Requirements according to IEC/EN 60204‑1
• Dimensioning for bundled cable routing, e.g. according to DIN VDE 0298 Part 4 or
IEC 60364-5-52
6.1.2
Terminal box
Hazardous voltage
Electric motors have high voltages. When incorrectly handled, this can result in death or severe
injury.
Switch off the machine so that it is in a no-voltage condition before you open the terminal box.
78
DANGER
1MB..5/6 shaft height 71 ... 355
Operating Instructions, 11/2023, A5E52779956A
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