to use wire end ferrules, then before connecting the cable, attach these so as to form an
appropriate, current-carrying crimped joint at the end of the conductor.
WARNING
Danger of explosion if the conductor ends become too hot
If the end of the conductor is not correctly enclosed by the wire end ferrule, but is trapped by
it, this can lead to overheating. The temperature class of the machine can be exceeded. This
can trigger ignition of an explosive mixture. This can result in death, serious injury or material
damage.
● Insert only one conductor end into each wire end ferrule. Attach the wire end ferrule
correctly.
● Insert only one conductor end into each terminal.
6.5.7
Use of 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 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.
For terminal box &1XB7.. with aluminum connection bars, you can also connect copper cables
using copper cable lugs.
Electrical connection
6.5 Inserting and routing the cables
SIMOTICS FD 1MH1
98
Operating Instructions 08/2017
Summary of Contents for SIMOTICS FD 1LL1
Page 2: ...18 08 2017 17 24 V10 00 ...
Page 176: ...Disposal 11 4 Disposal of components SIMOTICS FD 1MH1 176 Operating Instructions 08 2017 ...
Page 178: ...Service and Support SIMOTICS FD 1MH1 178 Operating Instructions 08 2017 ...
Page 182: ...Quality documents SIMOTICS FD 1MH1 182 Operating Instructions 08 2017 ...
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