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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) Directive 2004/108/CE is the Directive developed to address
electromagnetic interference (EMI) issues in electronic laser system. In particular, the Directive requires
documents that define the emission and immunity standard. EN 61000-3-2:2006 defines the RF
emission limit. Generic standard EN 61000-6-2:2006 defines 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
system must be carried out according to the instructions below.
Connections and wiring. Laser system 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 system, 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).
•COMPLIANCE WITH REGULATION AND LAW 1-12
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