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General
This section covers the electrical connections for the HS20 laser system. The HS20 laser head has
three connectors on the rear of the unit that are used for signal and power communication.
24V power input
Interface connector
!
WARNING: Before any electrical connections are made, ensure that the HS20 and machine
controller are unpowered.
System grounding (earthing)
The HS20 laser head uses electrical feedback signals which can reach high frequencies, and which
often run over relatively long distances on a large machine. Therefore, the correct grounding (earthing)
of the system components and the screening of the interconnecting cables is a paramount to ensure
the reliability and performance of the laser head.
Several factors in the overall electrical characteristic of the installation will be relevant.
• The machine structure should be well bonded at the same potential.
• The HS20 laser head should be connected to earth via the 24V power input on the rear of the
unit.
• The laser head cables should be grounded with the following premise:
i. Connect the outer (braided) screen at both ends of each cable by connecting it to the
connector shell.
ii. Connect the inner (foil & drain wires) screen at the HS20 (signal source) end only.
• The 0V line should be connected wherever it is present.
To achieve optimal noise immunity it is essential to achieve a low impedance path from the various
system units to ground.
If the HS20 laser head is powered using the 16-way circular connector then it is recommend that the
unit is earthed using the 24V dedicated input connector. Either the 3 or 4 pin from this connector can
be connected to the machine or a suitable ground position.
HS20 cables and connectors
Both supplied connectors are solder terminal versions. Care should be taken during assembly as poor
termination can cause poor connection reliability and intermittent states from the laser system.
Figure 23 - HS20 connector and switch locations
Laser status
Signal status
Configuration switches are
under removable cover
Diagnostic connector
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