FXMP25 User Guide 21
Issue Number: 3 www.controltechniques.com
Safety information
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4.6 EMC (Electromagnetic compatibility)
The FXMP25 meets immunity requirements (specified in section 8.17 Electromagnetic
compatibility (EMC) on page 58) with no special precautions.
Radio frequency noise emission can occur from any of the power connections i.e. AC
supply and field output terminals.
For many applications in heavy industrial environments the noise emission is not
sufficient to cause interference to other equipment.
When radio frequency emission must be limited an input EMC filter can be installed.
Shielded cables must be used for the field and the shield must be clamped to grounded
metallic parts at both ends. The standard is met for cable lengths up to 100m.
Table 4-7 FXMP25 emission compliance
* Filters can be sourced directly from Schaffner.
Key (shown in decreasing order of permitted emission level):
C4 EN 61800-3:2004 second environment, restricted distribution (Additional
measures may be required to prevent interference).
C2 Industrial generic standard EN 61000-6-4:2007.
EN 61800-3:2004 first environment restricted distribution (The following caution
is required by EN 61800-3:2004).
Some special measures may be required in certain applications where the control
cables are long or pass outside the building. See section 4.6.1 Surge immunity of
control circuits - long cables and connections outside a building on page 22.
Filter * Conformity
No filter C4
Schaffner FN3280H-25-33 C2
The recommended filter has been selected to be compatible with the SCR control
circuit in the FXMP25 unit. It is strongly recommended that no other filter type be used.
SCRs can be damaged by filters with unsuitable output impedance (capacitors
connected directly to the output).
The filter must be used in conjunction with a suitable RFI filter for the armature supply.
The filter input must obtain its supply from the input of the armature filter and line
chokes, otherwise it may be over-heated and possibly damaged by the armature
voltage notching.
This is a product of the restricted distribution class according to IEC 61800-3. In a
residential environment this product may cause radio interference in which case the
user may be required to take adequate measures.
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