Vacon 100 INDUSTRIAL Marine Installation Manual - page 22
Instead of mitigating the high-frequency emissions locally, in high-power or special
installations it is more economical to make a system-wide high-frequency compatibility
analysis. In the analysis you can find the problems and then do the necessary mitigation
actions. This is called EMC planning.
For Vacon 100 drives, there are 3 different EMC cases.
1
.
Installing a drive in an IT network
2
.
Installing a drive in a grounded network: maximum 500 V, enclosure sizes MM4-MM6
and MR4-MR9, not the enclosed drives
3
.
Installing a drive in a grounded network: 525-690 V, enclosure sizes MR10-MR12, and the
enclosed drives
To make your system compatible with the marine EMC requirements, obey the instructions
below.
4.3.1
INSTALLING A DRIVE IN AN IT NETWORK
If the drive is installed in an IT (that is, floating ground) or HRG (that is, high resistance
ground) network, disconnect the ground capacitors of the EMC filter. See the Installation
Manual of your Vacon 100 product for the disconnection instructions. The disconnection
changes the EMC class of the drive to level C4 of the IEC 61800-3 standard.
The drive fulfills the requirements of the special power distribution and passenger
accommodation zones of the IEC 60533 standard. To fulfill the requirements in a general
power distribution zone, you must make an EMC plan (refer to IEC 61800-3, Annex E). The
nature of the IT network minimizes the disturbance currents that circulate in the ground
potential. Thus, you can achieve compatibility with simpler procedures than in grounded
networks.
CONDUCTED EMISSIONS
When the drive is in Run state, a high-frequency common mode voltage is present in the
network. To prevent compatibility problems, obey the common engineering practice for IT
and HRG networks. In the practice, the ground capacitance of connected devices is
minimized, and thus EMC issues that are caused by circulating currents are minimized in the
area of the supply transformer.
RADIATED EMISSIONS
To get the best compatibility on radiated emissions that are lower than 100 MHz, use a motor
cable with low-impedance shield. Make a 360° grounding of the shield at both the drive and
motor end. If there is a high risk of interference emission from the mains cable, use a
shielded cable and make a 360° grounding at both ends of the mains cable.
No special procedures for emissions that are higher than 100 MHz are necessary, because
the choice of grounding of the mains cable does not have an effect on these emissions.
4.3.2
INSTALLING A DRIVE IN A GROUNDED NETWORK: MAXIMUM 500 V, ENCLOSURE
SIZES MM4-MM6 AND MR4-MR9, NOT THE ENCLOSED DRIVES
In this class, the drives comply with the requirements for marine installations in the allowed
installation zones.
VACON · 22
MOUNTING
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