Do-more H2 Series PLC User Manual, 1st Edition, Rev. F - H2-DM-M
B-6
Appendix B: European Union Directives (CE)
1
B
3
D
5
H
7
10
I
10
11
12
13
14
A
B
C
D
AC Mains Filters
The DL205 AC powered base
power supplies require extra
mains filtering to comply with the
EMC Directive on conducted RF
emissions. All PLC equipment
has been tested with filters from
Schaffner, which reduce emissions
levels if the filters are properly
grounded (earth ground). A filter
with a current rating suitable to
supply all PLC power supplies
and AC input modules should be
selected. We suggest the FN2080
for Do-more systems.
NOTE:
Very few mains filters can reduce problem emissions to negligible levels. In some cases, filters may
increase conducted emissions if not properly matched to the problem emissions.
Suppression and Fusing
In order to comply with the fire risk requirements of the Low Voltage and Machinery Directive
electrical standards (EN 61010–1 and EN 60204–1), by limiting the power into “unlimited”
mains circuits with power leads reversed, it is necessary to fuse both AC and DC supply inputs.
You should also install a transient voltage suppressor across the power input connections of the
PLC. Choose a suppressor such as a metal oxide varistor, with a rating of 275VAC working
voltage for 230V nominal supplies (150VAC working voltage for 115V supplies) and high
energy capacity (eg. 140 joules).
Transient suppressors must be protected by fuses and the capacity of the transient suppressor
must be greater than the blow characteristics of the fuses or circuit breakers to avoid a fire
risk. A recommended AC supply input arrangement for Koyo PLCs is to use twin 3 amp TT
fused terminals with fuse blown indication, such as DINnectors DN–F10L terminals, or twin
circuit breakers, wired to a Schaffner FN2010 filter or equivalent, with high energy transient
suppressor soldered directly across the output terminals of the filter. PLC system inputs should
also be protected from voltage impulses by deriving their power from the same fused, filtered,
and surge-suppressed supply.
Internal Enclosure Grounding
A heavy-duty star earth terminal block should be provided in every cubicle for the connection
of all earth ground straps, protective earth ground connections, mains filter earth ground wires,
and mechanical assembly earth ground connections. This should be installed to comply with
safety and EMC requirements, local standards, and the requirements found in IEC 1000–5–2.
The Machinery Directive also requires that the common terminals of PLC input modules, and
common supply side of loads driven from PLC output modules should be connected to the
protective earth ground terminal.
Transient
Suppressor
Fused
Terminals
Earth
Terminal
Filter
Schaffner
FN2010
To AC
Input
Circuitry
L
N
H2-DM1E
