NORD Drivesystems BU0500 - Manual (Page 44)

SK 500E – Users Manual for Frequency Inverters
44 BU 0500 GB-1013
Adaptation above size 8
The adaptation to the IT network is carried out via the DIP
switch "EMC Filter" (1). As delivered, this switch is in the "ON"
position.
For operation in an IT network the switch must be set to the
"OFF" position. The leakage current is reduced, with a
deterioration in the EMC compatibility.
Pos : 50 /Anl eitungen/ Elektroni k/FU und Start er/ 2. M ont age und Ins tall ati on/ 2. 10. 3 Gl eic hspannungs koppl ung [BU 0500] @ 1\ mod_1331196183481_388.doc x @ 17758 @ 3 @ 1
2.10.3 DC-coupling
NOTICE Overload of link circuits
It is essential to note the following summary of criteria for the setup of a DC supply or the coupling of the link
circuits of frequency inverters.
Errors in the link circuit coupling have especially negative effects on the charging circuits in the inverters or on the
life span of the link circuits - including their complete destruction.
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 general, in case of DC coupling, wherever
possible, devices with the same power should be connected together. Furthermore, only operational
devices (whose link circuits are charged) must be coupled.
Connection
Size 1 … 7 +B, - DC
Above size 8: + DC, - DC
NOTICE DC coupling for single phase devices
For direct current coupling of single-phase devices, care must be taken that the coupling to the same external
conductor is used. Otherwise the device may be destroyed.
For the 115V devices (SK 5xx-xxx-112-O), no DC coupling is possible.