Connecting Aluminum Conductors; Internal Equipotential Bonding; Stepless Mating Face For Sealing In The Terminal Box Cover - Siemens SIMOTICS HV C Operating And Installation Instructions

6.3.4

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
● Then grease the contact areas immediately using neutral Vaseline. This prevents a new
See also
The 5 safety rules (Page 14)
6.3.5

Internal equipotential bonding

The equipotential bonding between the ground terminal in the terminal box and the motor frame
is established via the terminal box fixing bolts and via defined equipotential bonding surfaces.
The contact points for the equipotential bonding connection underneath the bolt heads are
bare metal and protected against corrosion.
The standard cover fixing screws are sufficient as equipotential bonding between the terminal
box cover and terminal box enclosure.
6.3.6

Stepless mating face for sealing in the terminal box cover

The sealing face of the terminal box cover is formed by the terminal box enclosure and the
cable entry element. Therefore make sure these parts are correctly aligned, so as to ensure
the seal and hence the degree of protection.
Align the cable entry support and the cable entry plate to the terminal box enclosure so that
the sealing surface between the terminal box and the terminal box cover form a flat face. There
must be no steps in the sealing area.
SIMOTICS HV C 1NB1402-2AA84-4CA0-Z
Operating Instructions 06/2018
contact areas on the conductor and/or the mating piece. Do this using a brush or file.
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 machine
– or even in total failure, as well as material damage to the plant or system due to machine
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.
Electrical connection
6.3 Inserting and routing the cables
63