Siemens SINAMICS G120P VSD Getting Started Manual - Page 9
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3.2 EMC Considerations
In 2005 the standards governing the level of acceptable noise emission and immunity (or Electro Magnetic
Compatibility AS/NZS 61800.3) were redefined to ensure that the appropriate level of filtering and installation
methods were used to suit the differing environments that the equipment operated in.
This meant that for industrial areas where the chance of causing disruption to third parties was minimal, the
level of electromagnetic noise allowed to be emitted was greater than for commercial areas where there
might be consumer or medical devices. So the costs of additional filtering and installation methods would
only be incurred when necessary, rather than a one size fits all approach.
These areas are called the First Environment, and Second Environment. For the HVAC Industry the First
Environment is the most common situation, and is defined below. Note that there are sub-categories that
further define the EMC requirements.
First Environment (also known as Domestic)
An environment that includes domestic premises and establishments that are connected directly to a public
low-voltage power supply network (i.e. 240/415V) without the use of an intermediate transformer
(11kV/415V). For example: houses, apartments, commercial premises or offices in a residential building.
Second Environment (Typically Industrial)
All other environments not falling under the First Environment definition. For example a factory supplied by a
dedicated transformer that does not also feed domestic or residential buildings.
3.2.1 Category C1 (First Envir.)
Power Drive System (PDS, i.e. VSD + Motor + Sensors) of rated voltage less than 1000 V intended for use
in the First Environment. This means any equipment that can be connected to a supply shared by
residencies, and is a 'catch-all' that includes portable equipment. This would require Class B EMC
filters.
3.2.2 Category C2 (First Envir.)
Power Drive System (PDS) of rated voltage less than 1000 V, which is neither a plug in device nor a
movable device, and when used in the First Environment, is only intended to be installed and commissioned
by a professional. This is for fixed plant and equipment, and is where the majority of G120P would be
installed. Class A EMC filters would be the first choice, but may need to upgrade to Class B.
Note: A professional is a person or an organization having necessary skills in installing and/or
commissioning a Power Drive System (PDS), including their EMC aspects. This means an electrician with
the relevant competency.
3.2.3 Category C3 (Second Envir.)
Power Drive System rated less than 1000V intended for use in the Second Environment, and not intended
for the First Environment. Industrial rated equipment installed in a building with its own transformer.
G120P Motor Cabling Requirements
The following cabling requirements should be adopted to meet the Category specifications – as indicated in
the table below.
PM230
EMC Filter Class B
(standard offering)
* Power Modules with Class B integrated filters, frame sizes A to C, must be fitted with a blue ferrite
ring on the motor cable between the Power Module power terminals and the screening plate of the
Power Module to fulfil EMI category C1 conditions.
Power Modules with Class B integrated filters, frame sizes B and C must be fitted with a grey ferrite
ring/s on the mains supply input cable in addition to the ferrite ring on the motor cable.
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Cable type
EMC category
Screened
C1 (conducted only)
Screened
C2
Unscreened
None (Special Cases Only)
Building Technologies
Max. cable length
25 m* (with blue ring)
50 m (no blue ring)
100 m
Last Revised: 4/11/2011