Booksize DC Link Components
6.4 Voltage Clamping Module
Booksize power units
Manual, (GH2), 06/2008, 6SL3097-2AC00-0BP6
427
6.4 6.4 Voltage Clamping Module
6.4.1 Description
Under certain unfavorable conditions, voltage rises can occur in extended drive line-ups due
to the stimulation of the system resonance frequency. This can be particularly damaging for
the insulation systems of the connected motors since partial discharges can occur.
The Voltage Clamping Module ensures that the motor voltages are limited to permissible
values even when resonance occurs. The Voltage Clamping Module must always be used if
the total lengths of all the motor and DC link cables exceed the following value:
● 350 m for shielded cables.
● 560 m for unshielded cables.
In conjunction with the Voltage Clamping Module, the following total cable lengths are
permitted:
● 630 m for shielded cables
● 850 m for unshielded cables
Limitations/secondary conditions
The following secondary conditions must be observed:
● Power derating for Line Module to 80 %.
● Max. step-up factor (rectification factor V
dc
/V
line
) with controlled infeed: 150 %.
● No built-in motors must be connected (torque motors, linear motors).
● Can only be connected to TN line supply systems with grounded neutral point.
● The EMC limit values (radio interference voltage) are no longer observed, which means
that special measures have to be taken to ensure CE conformity (on-site measurement
(subject to charge) and adjusted filter). Contact: EPCOS, mailto:emv.labor@epcos.com
Compatibility
The Voltage Clamping Module can be integrated in the drive line-up with:
● Internal air cooling with mounting brackets (included in the scope of supply)
● External air cooling
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