Hitachi LM-C300 Series User Manual page 21

SAFETY OF LASER PRODUCTS APPLICATION GUIDE
The European Norm (EN) document EN 60825-1 was developed to protect persons from laser radiation
by imposing requirements upon manufacturers of laser products to provide an indication of laser radiation;
to classify laser products according to the degree of hazard; to require both user and manufacturer to
establish procedures so that proper precautions are adopted; to ensure adequate warnings of the hazards
associated with accessible radiation through signs, labels, and instructions; to improve control of laser
radiation through protective features; and to provide safe usage of laser products by specifying user
control measures.
The marking system is designed to comply with the requirements set forth in EN 60825-1. Table 1
summarizes the marking system features, indicating the type and description of these features and
whether those features are required by European Union regulations.
ELECTROMAGNETIC COMPATIBILITY APPLICATION GUIDE
The Electromagnetic Compatibility (EMC) is the Directive developed to address electromagnetic
interference (EMI) issues in electronic Laser Marker. In particular, the Directive requires documents that
define the emission and immunity standard. EN 61000-6-4 defines the emission limit. Generic standard
EN 61000-6-2 defines the immunity requirements published by the International Electromechanical
Commission (IEC).
The requirements to comply with required EMC regulations is due to the increasing use of powerful
electronic devices, which because of the techniques used, are the source of disturbances in a wide range
of frequencies (emission); at the same time they are also affected by disturbances produced by other
devices and thus require an adequate level of immunity.
(1) Disturbances are normally classified as low frequency (0 < f <9 kHz) and high frequency
(f > 9 kHz). Low frequency phenomena, which are particularly important, are those connected to
harmonic frequencies and electrical frequencies. There are other widespread phenomena such
as electrostatic discharge in air or by contact.
(2) Disturbances can be transmitted via conductors (conducted disturbances in a field ranging
from 0.15 MHz to 30 MHz) and via irradiation (irradiated disturbance ranging from 30 MHz to
1000 MHz).
(3) Case studies in industrial environments point to conducted disturbances as the main cause of
failure to comply with electromagnetic compatibility. For this reason, installation of a Laser Marker
must be carried out according to the instructions below.
Connections and wiring:
Laser Marker connections to other devices and external sources must be made taking into account
criteria of minimizing electromagnetic influence between them. Power circuit wiring must be physically
separated from command and control circuits (signal circuit). This is done using metal channels,
protective mesh or protective screens.
Filter devices:
All Laser Marker, which requires supplementary devices to comply with the EMC regulations, must be
equipped with such devices, and assembled according the manufacturer instructions. Supplementary
devices include RC units to mount parallel to AC relay coils, diodes to mount parallel to DC relay coils,
filters for high frequency conducted disturbance to be mounted on the network input (ask Hitachi for
the most suitable type).
Wire shielding:
Wire shielding must end as close to the incoming terminal boards as possible.
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