6
05.01
6.6 DC link options
6-197
Siemens AG 2001 All rights reserved
SIMODRIVE 611 Planning Guide (PJU) – 05.01 Edition
6.6.2 Overvoltage limiting module
The overvoltage limiting module limits overvoltages at the line supply input to
acceptable values. These are caused, e.g. as a result of switching operations at
inductive loads and at line supply matching transformers. For line supply infeed
modules above 10 kW (100 mm wide), the overvoltage limiting module can be
inserted at interface X181.
The overvoltage limiting module is used if there are upstream transformers or
for line supplies which are not in conformance with CE (unstable line supplies).
The overvoltage limiting module is required if the line supply infeed module is to
be implemented in conformance with UL.
For the 5 kW UI module, an appropriate protective circuit is already integrated
as standard.
Table 6-16 Technical data
Max. energy absorption 100 Joule
Weight approx. 0.3 kg
Dimensions (H x W x D) 76 mm x 70 mm x 32.5 mm
Module depth max., for the stretched–out status 325 mm
Order number 6SN1111–0AB00–0AA0
6.6.3 Pulsed resistor module
The pulsed resistor module can be used to quickly discharge the DC link. The
DC link energy is converted into heat. Additional applications are, for example,
increasing the pulsed resistor rating when using an uncontrolled infeed module
or reducing the DC link voltage for controlled braking operations when the
power supply fails. Several modules can also be connected in parallel.
When using the internal pulsed resistor > 200 W to its maximum, we recom-
mend that the hot air deflection plate is used as this keeps the heat from the
modules located above.
The universal housing design of the pulsed resistor module can be used in ex-
ternally cooled module groups.
6 Infeed Modules
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