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6.8.3
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.
6.9
Connecting converters
6.9.1
Connecting converters
NOTICE
Material damage caused by an excessively high supply voltage
Material damage can occur if the supply voltage is too high for the insulation system.
• Observe the values in the following tables.
SIMOTICS machines can be operated with SINAMICS G converters and SINAMICS S converters
(uncontrolled and controlled infeed) when maintaining the permissible peak voltages.
The insulation system of SIMOTICS machines corresponds to the specifications laid down in IEC
60034-18-41 according to voltage stress category C (IVIC C = high stress).
Table 6-6
Maximum voltage peaks at the motor terminals
Rated motor voltage
V
≤ 500 V
1FU9
Operating Instructions, 07/2020, A5E46712792A
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.
Û
phase-to-phase
1500
Maximum peak voltage at the motor terminals
Û
V
pk
Electrical connection
6.9 Connecting converters
phase-to-ground
V
pk
1100
DC link U
DC
V
750
69
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