NORDAC PRO (SK 500P) – Users Manual for Frequency Inverters
42 BU 0600 en-2319
2.5.3.4 Braking resistor (B+, B-)
Terminals +B/ B- are intended for the connection of a suitable braking resistor. A short screened
connection should be selected.
Hot surfaces
The braking resistor and all other metal components can heat up to temperatures above 70 °C.
• Danger of injury due to local burns on contact.
• Heat damage to adjacent objects
Allow sufficient cooling time before starting work on the product. Check the surface temperatures with
suitable measuring equipment. Maintain an adequate distance to adjacent components or provide
protection against contact.
2.5.3.5 DC coupling (B+, DC-)
Link circuit overload
Link circuit coupling faults can have negative effects on the charging circuits in the inverters or the life
of the link circuits, up to their complete destruction.
• It is essential to observe the criteria which are summarised below for setting up the DC supply /
link circuit coupling of frequency inverters.
• For direct current coupling of single-phase devices, it is essential to take care that coupling to the
same external conductor is used.
In drive engineering, DC-coupling is advisable if motors act as drivers and generators at the same
time in the system. Here, the energy from the drive which is acting as a generator can be fed back to
the drive which is acting as a motor. The advantages are lower energy consumption and the sparing
use of braking resistors. In addition, the energy balance can be made even more efficient with the use
of a regenerative feedback unit or an input/feedback unit. In principle, wherever possible devices with
the same power should be connected together for DC coupling. Furthermore, only devices which are
ready for operation (whose link circuits are charged) may be coupled.
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