58
Complex Components
In accordance with the provisions described in
the European Commission Guidelines
Document on Council Directive 89/336/EEC,
IMO Precision Controls Ltd has chosen to clas-
sify the Jaguar VXS range of inverters as
“Complex Components”. The objective of this
decision is to enable IMO Precision Controls
Ltd to maximise their support for customers’
own implementation of the EC directives.
Classification as a “Complex Component”
allows a product to be treated as an ”appara-
tus”, and thus permits compliance with the
essential requirements of the EMC Directive
to be demonstrated to both an integrator of
Jaguar VXS inverters (a constructor of switch-
boards, for example) and to his customer or
the installer and the user.
Standards and Marking
It is intended that Jaguar VXS inverters be
supplied with a CE-marked declaration of
conformity, signifying compliance with EC
Directive 89/336/EEC when fitted with speci-
fied filter units installed and earthed in accor-
dance with the data in this Product Manual.
The “EC Declaration of Conformity”, citing
conformity with European Harmonised
Standard EN60 947-1, “Specification for Low
Voltage Switchgear and Controlgear”, will be
available upon application to IMO Precision
Controls Ltd.
This specification requires the following per-
formance criteria to be met:
Immunity
Fast transient bursts (IEC801-4)
Electromagnetic (IEC801-3)
Electrostatic disturbances (IEC801-2)
Surges: 1.2 x 50
µ
s (IEC1000-4-5 para. 8/20)
Emissions
EN50081-1 or EN50081-2, as specified in the
EC Declaration of Conformity related to the
inverter.
Normally, Jaguar VXS inverters will offer
compliance with the more severe level of
EN50081-1 although the less-arduous option
of EN50081-2 would be adequate for industri-
al applications. Reference must, however, be
made to the EC Declaration of Conformity for
precise details, as there are differences
between models.
Power Input Filters and Output Ferrites
It is strongly recommended that that the
appropriate Jaguar VXS input filter is used, as
shown on pages 59 to 61, to limit RF current
flowing into the main supply circuit. Without
an input filter a Jaguar VXS installation may
not meet statutory requirements.
At the time of going to press, it is intended to
supply a toroidal ferrite output choke, page
62, with every input filter as an ‘EMC
Compliance’ kit.
Electromagnetic Emissions — general
Jaguar VXS inverters contain high-power
semiconductor devices which are switched at
high speeds to synthesise a near-sinusoidal
current waveform across the frequency range
of the output. Typically, the transition time
from the OFF state to fully-conducting is of
the order of 200ns (200 x 10
-9
s) for these
devices. Such rapidly-changing voltages and
currents will generate some degree of electro-
magnetic emission.
Emissions will be predominantly conducted
through the motor cables and the mains supply
cables, although some radiated emissions will be
detected in close proximity to the drive system.
It is essential that precautions are taken both
at the design stage and at the time of installa-
tion to prevent radio-frequency (RF) emis-
sions from the drive system interfering with
sensitive equipment in close proximity.
General Precautions
It is strongly recommended that a metallic
Back Plate is used as an earth plane for all
the safety earth and EMC earth-bonding
connections. This very powerful technique
meets all the safety earthing requirements and
gives vastly improved EMC performance.
10.1
Electromagnetic Compatibility (EMC)
10 EMC, RFI and Filters
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