Mains connection and line-side power components
3.6 Line contactors
SINAMICS S110
42 Manual, 07/2015, 6SL3097-4AC10-0BP5
A line contactor is required if the drive line-up needs to be electrically isolated from the
power supply.
The characteristic values in the technical data apply when the line contactor is selected. You
must consider the type of routing, the bundling factor, and the factor for the ambient
temperature according to EN 60204-1 when dimensioning the conductors to be connected.
Damage to the drive electronics when switching the line contactor under load
If you switch the line contactor (recommended type) under load, the contacts will wear out
prematurely. This may lead to faulty functioning of the contactor with subsequent damage
to the drive electronics.
• Use a leading auxiliary break contactor and/or use a Voltage Sensing Module (VSM10).
• If this is not possible, avoid switching the line contactor under load.
Note
To limit the switching overvoltage, the contactor coil must be connected to an overvoltage
limiter (e.g. freewheeling diode or varistor).
When the digital output is used to control the line contactor, you must consider the
make/break capacity.
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