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Mentor MP User Guide                       47
Issue: 3                        www.controltechniques.com
4.9.3     EMC filter information
Refer to Figure 4-1 on page 33 for the location of the optional EMC filter. See Table 4-20 for EMC filters that can be sourced directly from Epcos and 
Schaffner.
Table 4-20 Mentor MP and EMC filter cross references
* This filter is required if the input current to the Mentor MP will be greater than 66 Amperes.
Table 4-21 Emission compliance 
Key (shown in decreasing order of permitted emission level):
C4 EN 61800-3 second environment, restricted distribution 
(Additional measures may be required to prevent interference)
C3 EN 61800-3 second environment, unrestricted distribution
C2 Industrial generic standard EN 50081-2 (EN 61000-6-4) 
EN 61800-3 first environment restricted distribution (The 
following caution is required by EN 61800-3)
C1 Residential generic standard EN 50081-1 (EN 61000-6-3)
EN 61800-3 first environment unrestricted distribution
EN 61800-3 defines the following:
• The first environment is one that includes residential premises. It 
also includes establishments directly connected without intermediate 
transformers to a low-voltage power supply network which supplies 
buildings used for residential purposes.
• The second environment is one that includes all establishments 
other than those directly connected to a low-voltage power supply 
network which supplies buildings used for residential purposes.
• Restricted distribution is defined as a mode of sales distribution in 
which the manufacturer restricts the supply of equipment to 
suppliers, customers or users who separately or jointly have 
technical competence in the EMC requirements of the application of 
drives.
4.9.4     Surge immunity of control circuits - long 
cables and connections outside a building
The input/output ports for the control circuits are designed for general 
use within machines and small systems without any special precautions.
In applications where they may be exposed to high-energy voltage 
surges, some special measures may be required to prevent malfunction 
or damage. Surges may be caused by lightning or severe power faults in 
association with grounding arrangements which permit high transient 
voltages between nominally grounded points. This is a particular risk 
where the circuits extend outside the protection of a building. 
As a general rule, if the circuits are to pass outside the building where 
the drive is located, or if cable runs within a building exceed 30m, some 
additional precautions are advisable. One of the following techniques 
should be used:
1. Galvanic isolation, i.e. do not connect the control 0V terminal to 
ground. Avoid loops in the control wiring, i.e. ensure every control 
wire is accompanied by its return (0V) wire.
2. Shielded cable with additional power ground bonding. The cable 
shield may be connected to ground at both ends, but in addition the 
It is essential that line reactors be connected between the 
filter terminals and the power input terminals, as shown in 
Figure 4-1. Failure to observe this requirement could result in 
destruction of the thyristors.
Model
Manufacturers part number
Schaffner armature 
standard 
Schaffner armature 
high performance 
Epcos 
armature 
high performance
Schaffner standard 
field filter
Epcos standard 
field filter
MP25A4(R)
FN3270H-80-35 FN3258-75-52
B84143-A66-R105
FN3280H-8-29 W62400-T1262D004
MP45A4(R)
MP75A4(R)  *B84143-A90-R105
MP105A4(R)
FN3270H-200-99 FN3258H-180-40 B84143BO250S080MP155A4(R)
MP210A4(R)
MP350A4(R)
FN3359-800-99
FN3280H-8-29
MP420A4(R)
MP550A4(R)
MP700A4(R)
MP825A4(R)
MP900A4(R)
MP1200A4(R)
FN3359-1600-99
MP1850A4(R)
Model
Filter
None
Field: Standard
Armature: Standard
Field: Standard
Armature:High 
performance
MP25A4(R)
C4
C3
C2
MP45A4(R)
MP75A4(R)
MP105A4(R)
MP155A4(R)
MP210A4(R)
MP350A4(R)
MP420A4(R)
MP550A4(R)
MP700A4(R)
MP825A4(R)
MP900A4(R)
MP1200A4(R)
MP1850A4(R)
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.