NORD Drivesystems BU0505 - Manual (Page 44)

SK 54xE – Users Manual for Frequency Inverters
44 BU 0505 GB-1013
PE U V W +B -B -DC
PE L3 L2 L1
L1 / L
L2 / N
L3 / -
PE
M
3~
PE U V W +B -B -DC
PE L3 L2 L1
M
3~
PE L3 L2 L1
Input/feedback
unit
For information on
connection and
protection, as well as the
necessary accessories,
please consult the
manufacturer of the
input/feedback unit.
+ -
Fig. 7 Diagram of a DC coupling with an input/feedback unit
The following points must be taken into consideration in association with a DC supply:
1 Use a connecting cable which is as short as possible between the DC bus and the equipment to
be connected. The connection and protection of the devices in the DC circuit must be carried
out for cable protection and the maximum cross-section of the device.
2 The link circuits of the individual frequency inverters must be protected with suitable fuses.
3 The frequency inverters only obtain their supply via the link circuit. Electrical isolation is carried
out via the power circuit breakers which must be provided in the supplies to the devices.
4 For frequency inverters above size 8, a DC supply is only permissible with an external charging
device.
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