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Unidrive SP Regen Installation Guide
81
Issue Number: 2 www.controltechniques.com
6.5.12 Conducted RF emission
Radio frequency emission in the frequency range from 150kHz to
30MHz is mainly conducted out of the equipment through electrical
wiring. It is essential for compliance with all emission standards, except
for IEC61800-3 second environment, that the recommended EMC filter
and a shielded (screened) motor cable are used. Most types of cable
can be used provided it has an overall screen. For example, the screen
formed by the armouring of steel wired armoured cable is acceptable.
The capacitance of the cable forms a load on the drive and should be
kept to a minimum. The same considerations apply to any cables
connecting the DC bus between drives, except that short direct wiring
within the same enclosure need not be screened.
When used with the recommended filters, the Regen drive system
complies with the requirements for conducted emission in the following
standards:
For installation in the “second environment”, i.e. where the low voltage
supply network does not supply domestic premises, no filter is required
in order to meet IEC61800-3 (EN61800-3):1996.
When an EMC filter is used the switching frequency filter
discussed above must also be used. Failure to observe this
may result in the EMC filter becoming ineffective and being
damaged.
Table 6-7 Requirements for conducted emission
Motor cable length (m)
Switching frequency (kHz)
3
0 to 100
I
CAUTION
Key to
table
Standard
Description
Frequency
range
Limits
Application
I
EN50081-2
Generic emission standard
for the industrial
environment
0.15 to 0.5MHz
79dB
µ
V quasi peak
66dB
µ
V average
AC supply lines
0.5 to 30MHz
73dB
µ
V quasi peak
60dB
µ
V average
EN61800-3
IEC1800-3
Product standard for
adjustable speed power
drive systems
Requirements for the first environment
1
: restricted distribution
2
Requirements for the second environment: unrestricted distribution
1
The first environment is one where the low voltage supply network also supplies domestic premises
2
Restricted distribution means that drives are available only to installers with EMC competence
Operation without a filter is a practical cost-effective
possibility in an industrial installation where existing levels of
electrical noise are likely to be high, and any electronic
equipment in operation has been designed for such an
environment. There is some risk of disturbance to other
equipment, and in this case the user and supplier of the drive
system must jointly take responsibility for correcting any
problem which occurs.
CAUTION
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