Commander SE User Guide 28
Issue Number 8 www.controltechniques.com
Section 4.5.2 Full EMC precautions should be followed in the following cases:
• When compliance with strict emission standards such as EN50081-1 or EN50081-2
is required.
• Where sensitive radio receiving or similar equipment is in use nearby.
• Where sensitive electronic equipment with poor electromagnetic immunity is in use
nearby.
4.5.1 Routine EMC precautions
The routine precautions are based on the following principles:
1. The motor cable carries a high level of electrical ‘noise’. It should be segregated
from all signal circuits, and should include a ground conductor linking the drive
ground directly to the motor frame.
2. The mains supply wiring also carries electrical noise and should be segregated from
signal circuits.
3. The drive also generates a noise field so sensitive circuits should not be passed
closetoit.
4. “Noise” current flows in power wiring and returns through the ground (earth). To
minimise noise loop areas, ground wires should be run as close as possible to their
associated power wires.
5. The drive ground tends to be ‘noisy’, so it is preferable for the control circuits to be
grounded only at the controller and not at the drive.
4.5.2 Full EMC precautions
Figure 4.7 shows the requirements which be followed closely in order to meet EMC
emission standards. Further guidance and information on EMC standards is given in the
EMC Data sheets which are available from Control Techniques’ Drive Centres or
Distributors.
Figure 4.12 Full EMC precautions
The above guidelines are applicable to all drive sizes.
For further information on the cable screening brackets and screening clamps kit, refer
to the Commander SE Advanced User Guide and the EMC Data sheets which are
NOTE
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