Line connection and line-side power components
3.5 Overvoltage protection
Booksize Power Units
Manual, (GH2), 04/2014, 6SL3097-4AC00-0BP6
57
To protect the units against line-side surge voltages, you are advised to install an
overvoltage protection device directly at the infeed point (upstream of the main switch). To
comply with the requirements of CSA C22.2 No. 14-05, a type VZCA or VZCA2 surge
arrester is absolutely mandatory. The Raycap company has suitable surge arresters.
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. The
cable routing, the bundling factor, and the factor for the ambient temperature according to
EN 60204-1 must be taken into account when dimensioning the various cables.
Damage to the drive electronics when switching the line contactor under load
When switching the line contactor (type according to the recommended selection) under
load, then the contacts will be subject to premature wear. This can cause the contactor to
malfunction, with subsequent damage to the drive electronics.
• Use a leading opening auxiliary contact or use a Voltage Sensing Module (VSM10).
• If this is not possible, then avoid switching the line contactor under load.
Note
If you are using a VSM10 Voltage Sensing Module, the leading opening contact can be
omitted.
Note
To limit the switching overvoltage, the contactor coil must be connected to a surge
suppressi
on device (e.g. free-wheeling diode or varistor).
When the digital output is used to control the line contactor, its switching capacity must be
taken into account.
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