Electromagnetic Compatibility (Emc); Routine Emc Precautions; Full Emc Precautions - Control Techniques Commander SE11200025 Guia Del Usuario

caused when a drive at room temperature is switched on is within the permitted limits.
The drive does not of itself cause periodic voltage fluctuation in normal operation. The
installer must ensure that the control of the drive is such that periodic fluctuations in
supply current do not infringe the flicker requirements where applicable. Note that large
periodic load fluctuations in the frequency range of between 1Hz and 30Hz are
particularly inclined to cause irritating lighting flicker and are subject to stringent limits
under EN61000-3-3.
4.5

Electromagnetic compatibility (EMC)

This section gives installation guidelines for ensuring electromagnetic compatibility.
Further detailed information is provided in the EMC Data sheets which are available
from Control Techniques' Drive Centres or distributors.
The drive meets the standards for electromagnetic immunity stated in section
3.2 General data on page 17 without any special installation precautions. To prevent
possible nuisance tripping, it is recommended that all inductive circuits associated with
the drive, for example relay coils, electromagnetic brakes etc. should be fitted with
appropriate suppression.
The following precautions should be taken to prevent the drive from causing
interference with other electronic equipment.
For general use the guidelines in section 4.5.1 Routine EMC precautions on page 33
should be followed. These are sufficient to prevent interference to general purpose
industrial and similar equipment of good quality recent design.
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
close to it.
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 4.12 shows the requirements which should 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.
Commander SE User Guide
Issue Number 9 www.controltechniques.com
33