Eurotherm 582, Руководство по эксплуатации продукта, Страница: 40 / 47

Chapter 11 ‘CE’ EMC Responsibility
11- 6 582/583/5831
For both AC and DC drives the conducted emissions increase with motor cable length. EMC
conformance to the stringent limits applied by Eurotherm Drives is only guaranteed up to a
maximum cable length of 5m, but can be increased dependent on reduced limits being applied.
This length can be still further increased by the use of output filters and chokes. Refer to the
separate Eurotherm Application manual entitled ‘EMC Installation Guidelines for modules and
systems’, part number HA388879 for more information
WARNING 1 : The AC supply filters produce earth leakage currents in excess of
3.5mA.
WARNING 2 : The AC supply filters contain capacitors phase to phase and phase to
earth. Discharge resistors are fitted, but the filters or cabling should not be touched
for a period of 1 minute after the removal of the AC supply.
WARNING 3 : The AC supply filter must only be used with a permanent earth
connection. Permanent earthing can be achieved by either a) using a copper
protective earth conductor of at least 10mm
2
or b) installing a second conductor in
parallel connection with the protective conductor to a separate protective earth
terminal. The conductor shall on its own meet the requirements for a protective earth
conductor.
WARNING 4 : Eurotherm Drives do not recommend the use of RCDs. Special
RCDs (Type B according to the second amendment of IEC755) are required due to
the AC and DC components flowing in the earth leakage current. All loads requiring
protection with the RCD would be at risk.
WARNING 5 : Eurotherm Drives only guarantee the thermal performance of the
EMC AC supply filter upto a maximum equivalent cable length of 150m.
Wall Mount (582/5831)
For wall mount applications filters CO389108, CO389110 will require mounting in a separate
suitable enclosure, and all connections made with conduit. In addition the optional 582 gland box
must be used. Ensure the filter to drive cable is passed through conduit mounted between the
filter and the drive gland box. This cable must be as short as possible (0.3m maximum) and
segregated from all other cables.
Cubicle Mount (582/583)
Ideally the filter will be mounted onto a metallic back panel in the cubicle to which the drive is
mounted too. The RF connection between the drive and filter will be usefully enhanced by
scraping away any paint/insulation between the filter and drive mounting points on the panel.
Liberally apply petroleum jelly over the mounting points and securing threads to prevent
corrosion.
SCREENING
All Eurotherm Drives modules comply with the radiated emission limits of EN55011 (1991)
Class A when installed in free air (Wall Mounted) according to these instructions, using an AC
supply filter and screened motor cable, but using unscreened control and signal cabling. Products
which meet the limits of Class A can be made to meet the more stringent limits of Class B by
simply mounting inside an enclosure with 10dB attenuation between 30 and 100MHz (which