Hitachi LM-C300 Series User Manual page 22

Metal panels:
All the panels which make up the system must be interconnected so that they present low impedance
to high frequencies. This is obtained by adding numerous screws between the unpainted covers or
using non-anodized aluminum. All the metal parts are connected with a good ground connection.
In applications where disturbances exceed legal limits, there may be disturbances and interferences
between the Laser Marker and other appliances, despite correct conformance with installation rules.
If there are interferences with another Laser Marker, do not use it at the same time, or move the two
devices further apart.
GUIDE FOR APPLYING LOW VOLTAGE SAFETY
The Laser Marker complies with Low Voltage Directive concerning electrical equipment operating at
voltages between 50 and 1000 VAC. Warning labels and shields for protecting the user are required. The
Laser Marker installation should be evaluated to ensure that it complies with the requirements laid down
in the Directives on Low Voltage.
(1) Installation:
Only professionally trained individuals can carry out installation work, connect the external
power source and, in general, perform any type of work on the electrical part. Dangerous
voltage is present inside the Laser source.
(2) Power cut-off device:
Since the Laser Marker is designed to be incorporated in a system including other equipment,
it is necessary to install a manually controlled power cut-off device common to the entire
system. This is the installer's responsibility.
(3) Stop function:
Since the Laser Marker is designed to be incorporated in a system including other equipment,
it is necessary to create a category 0 stop common to the entire system. This is the installer's
responsibility.
(4) Emergency stop:
Since the Laser Marker is designed to be incorporated in a system including other equipment,
the emergency stop must be installed based on the technical specifications of the system,
bearing in mind that it may be necessary in some equipment to let cooling water circulate for
a few seconds before disconnecting power. The emergency function is the installer's
responsibility.
(5) Protection category:
Most HITACHI Laser Marker has a minimum protection category of IP54. To comply with the
Machine Directive and Standard EN 60204, the installer is responsible for placing them in a
suitable container according to the protection category required for the end use.
(6) Ground Protection:
One of the three conductors of the electrical supply is grounded, meaning it has no electrical
power. This wire must be always connected to the laser.
The main reason for use of a ground connection between the laser and the electricity is the safety of
individuals, and the second is to protect the system.
In terms of operating safety, the ground connection helps prevent the occurrence of dangerous voltage
between parts that are accessible at the same time, up to frequencies for which the ground connection
(solely designed for the safety of individuals) can be considered low impedance.
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