Type Of Conductor Connection; Connecting Aluminum Conductors - Siemens SIMOTICS SD SH 71 315 Series Operating Instructions Manual

Electrical connection
6.6 Conductor connection
6.6.1

Type of conductor connection

Connection with cable lug
DIN 46 234
Bend down the cable lug for the connection.
Connection of an individual conductor with
terminal clamp copper cable
① Connecting bar
② Line supply cable
③ Motor connecting cable
6.6.2

Connecting aluminum conductors

If you are using aluminum conductors, then comply with the following:
• Use only cable lugs that are suitable for connecting aluminum conductors.
• Immediately before inserting the aluminum conductor, remove the oxide layer from the
contact areas on the conductor and/or the mating piece. Do this using a brush or file.
• Then grease the contact areas immediately using neutral Vaseline. This prevents a new
oxide layer from forming.
68
Terminal board
NOTICE
Aluminum flow due to contact pressure
Aluminum flows following installation due to the contact pressure. The connection using
clamping nuts can loosen as a result. The contact resistance increases, obstructing the
current from being conducted. This can result in fire and material damage to the motor –
or even in total failure, as well as material damage to the plant or system due to motor
failure.
• Retighten the clamping nuts after approximately 24 hours and then again after
approximately four weeks. Make sure that the terminals are de-energized before you
tighten the nuts.
Max. conductor cross-section
[mm²]
1LE7 shaft heights 71 ... 315
Operating Instructions, 04/2022, A5E51689275A-AA
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