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Unidrive SP Regen Installation Guide

www.controltechniques.com Issue Number: 2

Recommended EMC filters

These are the same filters as recommended for standard (non-

regenerative) operation:

Table 6-8 Recommended filters

Related product standards

The conducted emission levels specified in EN50081-2 are equivalent to
the levels required by the following product specific standards:

Table 6-9 Conducted emission from 150kHz to 30MHz

6.5.13 Radiated emission

Radio frequency emission in the frequency range from 30MHz to 1GHz
is mainly radiated directly from the equipment and from the wiring in its
immediate vicinity. Operation in regenerative mode does not alter the
radiated emission behaviour, and the EMC data sheet for the individual
Unidrive SPs used should be consulted for further information.

Theoretically the use of two drives physically close together can cause
an increase in emission level of 3dB compared with a single drive,
although this is usually not observed in practice. All Unidrive SPs have
sufficient margin in respect of the generic standard for the industrial
environment

EN61000-6-4

to allow for this increase.

6.5.14 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 6-15 Power cable considerations

6.5.15 Main contactors K2 with SPMC

When using an SPMC for the charging of a regen system the main
contactor K2 should be positioned as close as possible to the Regen
drives power terminals.

6.5.16 Multi-drive systems

It is common for regenerative drive systems to be constructed using
numbers of drives with a single input stage, or other more complex
arrangements. It is generally not possible to lay down specific EMC
requirements for such systems, since they are too large for standardised
tests to be carried out. In many cases the environment corresponds to
the “second environment” as described in IEC61800-3, in which case no
specific limit to conducted emission is required. National legislation such
as the European Union EMC Directive does not usually require that
complex installations meet specific standards, but only that they meet
the essential protection requirements, i.e. not to cause or suffer from
electromagnetic interference.
Where the environment is known to include equipment which is sensitive
to electromagnetic disturbance, or the low voltage supply network is
shared with domestic dwellings, then precautions should be taken to
minimise conducted radio frequency emission by the use of a filter at the
system power input.
For currents exceeding 300A up to 2500A suitable filters are available
from the following manufacturers:

Epcos B84143-B250-5xx (range up to 2500A)
Schaffner FN3359-300-99 (range up to 2400A)

These filters may not give strict conformity with EN61000-6-4, but in
conjunction with the relevant EMC installation guidelines they will reduce
emission to sufficiently low levels to minimise the risk of disturbance.

Drive

Motor cable

length m

Schaffner

Epcos

CT part no. CT part no.

SP1201 to SP1202

100

4200-6118

4200-6121

SP1203 to SP1204

4200-6119