Nidec Unidrive M600 Series - Control Connections

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Unidrive M Regen Design Guide 133
Issue Number: 4
6.5.12 Wiring guidelines
The wiring guidelines provided for the individual drives also apply to regenerative operation, except that the switching frequency filter must be
interposed between the input drive and the EMC filter. The same principles apply, the most important aspect being that the input connections to the
EMC filter should be carefully segregated from the power wiring of the drives which carries a relatively high “noise” voltage.
Figure 6-24 Power cable considerations
6.5.13 Main contactors K2 with Rectifier
When using a rectifier for the charging of a Regen system the main contactor, K2 should be positioned as close as possible to the Regen drives
power terminals.
6.6 Control connections
6.6.1 Unidrive M frame 10 and frame 11 external rectifier
When a Unidrive M frame 10 or frame 11 external rectifier is used to pre-charge a Regen system, the 24 V supply cable and RJ45 cable between the
rectifier and the inverter must not be connected. This prevents the inverter generating a power comms or PSU trip when the supply to the rectifier is
removed during the system start up sequence.
±DC bus connections
Regen drive Motoring drive
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Regen inductor Motor
Cable length B
Cable length A Cable length C
The DC connection between the Regen and
motoring drive carries common mode high
frequency voltage comparable with the output
voltage from a standard drive. Clearances and
recommendations for standard power cables
must be applied here.
The voltage present in the
wiring between the Regen
drive and regen inductor
is a source of radio
emission. These cables
should be kept as short as
possible. (I.e. The regen
inductor mounted as
close as possible to the
Regen drive.)
Standard wiring
practices apply.