Do-more H2 Series PLC User Manual, 1st Edition, Rev. F - H2-DM-M
B-5
Appendix B: European Union Directives (CE)
1
B
3
D
5
H
7
10
I
10
11
12
13
14
A
B
C
D
Basic EMC Installation Guidelines
Enclosures
The simplest way to meet the safety requirements of the Machinery and Low Voltage
Directives is to house all control equipment in an industry standard lockable steel
enclosure. This normally has an added benefit because it will also help ensure that the EMC
characteristics are well within the requirements of the EMC Directive. Although the RF
emissions from the PLC equipment, when measured in the open air, are well below the EMC
Directive limits, certain configurations can increase emission levels. Holes in the enclosure,
for the passage of cables or to mount operator interfaces, will often increase emissions.
Electrostatic Discharge (ESD)
We specify in all declarations of conformity that our products are installed inside an industrial
enclosure using metallic conduit for external wire runs; therefore, we test the products in a typical
enclosure. However, we would like to point out that although our products operate normally in
the presence of ESD, this is only the case when mounted within an enclosed industrial control
cabinet. When the cabinet is open during installation or maintenance, the equipment and or
programs may be at risk of damage from ESD carried by personnel.
We therefore recommend that all personnel take necessary precautions to avoid the risk
of transferring static electricity to components inside the control cabinet. If necessary, clear
warnings and instructions should be provided on the cabinet exterior, such as recommending
the use of earth straps of similar devices, or the powering off of equipment inside the
enclosure.
Mains Fuse/
Isolation Transformer
Pressure-sensitive
switch for power
Transient voltage
suppressor
*Mains filter
Lockout switch for
communication
*Toroid for
communication
cables
Conduit for
communication
cables
Conduit fo
communic
cables
*Separate conduit
and toroid coils
for DC signals
AC signals, and
analog signals
I/O common
ground
Metallic conduit
required
*May be required for CE compliance
(see Declaration of Conformity for
specific product requirements).
*S
a
fo
A
a
2" (50mm)
minimum
clearance
all sides
RS-232
SERIAL
USB
PGM
PORT
RUN
TERM
STOP
1
0
/
1
0
0
E
T
H
E
R
N
E
T