Electrical connection
6.6 Conductor connection
1LE7 shaft heights 71 ... 315
68
Operating Instructions, 04/2022, A5E51689275A-AA
6.6.1
Type of conductor connection
Terminal board
Max. conductor cross-section
[mm²]
Connection with cable lug
DIN 46 234
Bend down the cable lug for the connection.
25
Connection of an individual conductor with
terminal clamp copper cable
10
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.
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.
